/

How to watch NASA’s Artemis I SLS moon rocket launch

57 mins read

The gigantic Space Launch System (SLS) of NASA is almost ready to launch. This much-awaited rocket launch, which has been planned for more than a decade, represents NASA’s return to crewed moon missions. While there won’t be any astronauts on board for this launch, the “Artemis I” mission will act as a test for the future objective of landing the first woman and the first person of color on the Moon.

NASA’s Orion capsule will be launched by the SLS during its initial flight, where it will begin a journey around the Moon that might last 39 to 42 days. A four-mile mission that took NASA nearly 10 hours to complete last week involved rolling the 322-foot rocket to launch pad 39B at the Kennedy Space Center in Florida.

How to watch NASA’s Artemis I SLS moon rocket launch
(Courtesy of NASA)

Here is how to watch NASA’s Artemis I SLS moon rocket launch

The SLS rocket will be launched by NASA on August 29, 2022. The launch window will last for two hours and begin at 8:33 am ET/6:03 pm IST. If there are no delays, the rocket could launch at any moment between 8:33 am ET and 10:33 am ET (8:03 pm IST).

NASA is live streaming the launch from its website, YouTube channel, and NASA app if you can’t attend in person. We have also embedded NASA’s live YouTube player so you can watch rocket lunch directly from here without leaving this site.


Every possible update of Artemis I SLS Moon Rocket Launch

Artemis

NASA Artemis’s Twitter feed updates


Artemis blog updates

*All updates are in the newest to older sort order

Notice: We’re closing this blog update from NASA’s Artemis, please check the new and all the latest updates from the above Official Twitter feed of NASA’s Artemis as they are added frequently as well as the Artemis blog.


Update from Nov. 16, 2022 — “Orion Begins Checkouts, Completes First Service Module Course Correction Burn”

9:23 pm — Following a successful launch on Wednesday, Nov. 16, NASA’s uncrewed Orion spacecraft is heading toward the Moon on a 25.5-day mission beyond the lunar surface. Orion lifted off atop the Space Launch System (SLS) rocket at 1:47 a.m. EST from Launch Complex 39B at NASA’s Kennedy Space Center in Florida. Engineers intend to learn as much as possible about Orion’s performance during the flight test and are focused on the primary objectives for the mission: demonstrating Orion’s heat shield at lunar return re-entry conditions, demonstrating operations and facilities during all mission phases, and retrieving the spacecraft after splashdown.

Flight controllers in the Mission Control Center at NASA’s Johnson Space Center in Houston successfully completed the first outbound trajectory correction burn by the European-built service module’s main engine as planned at 9:32 a.m. The burn tested Orion’s main engine for the first time and adjusted the spacecraft’s course toward the Moon. Several additional course correction burns are planned on journey.

While Orion began its trek toward the lunar environment, 10 CubeSats deployed by timer from an adapter still attached to the SLS’s upper stage. Each CubeSat has different timelines for acquiring a signal with its mission operators.

Flight controllers performed a modal survey, a test to verify that the models and simulations used to design Orion’s solar array wings accurately reflect the motion that is occurring in flight. This was accomplished by firing Orion’s reaction control system thrusters and observing how the solar array wings react to that specific firing sequence. Engineers also calibrated the optical navigation system and gathered imagery using the spacecraft’s cameras. Orion is outfitted with multiple cameras used for various functions such as engineering as well as sharing the progress of the mission with the public.

Scheduled for Thursday is the second outbound trajectory burn using the auxiliary thrusters, which will be used for most trajectory correction burns.


Update from Nov. 16, 2022 — “Orion on Its Way to the Moon”

3:44 am — The interim cryogenic propulsion stage (ICPS) completed its approximately 18-minute trans-lunar injection (TLI) burn and the spacecraft has separated from the stage. Orion fired its auxiliary thrusters to move a safe distance away from the expended stage and the spacecraft is on its way to the Moon.

NASA will hold a postlaunch news conference at 5 a.m. EST today from Kennedy Space Center in Florida. Participants are:

  • Bill Nelson, NASA administrator
  • Mike Sarafin, Artemis mission manager, NASA Headquarters
  • Mike Bolger, Exploration Ground Systems Program manager, Kennedy
  • John Honeycutt, Space Launch System Program manager, Marshall
  • Howard Hu, Orion Program manager, NASA’s Johnson Space Center
  • Emily Nelson, chief flight director, Johnson

Update from Nov. 16, 2022 — “Perigee Raise Maneuver Complete”

2:41 am — The perigee raise maneuver has been successfully completed. The interim cryogenic propulsion stage fired for just over 20 seconds to raise the lowest point of Orion’s Earth orbit in preparation for the critical trans-lunar injection burn that will send Orion to the Moon. The trans-lunar injection burn is currently targeted for about 3:14 a.m. EST and will last about 18 minutes.


Update from Nov. 16, 2022 — “Orion solar array deploy complete”

2:24 am — Orion’s solar arrays have completed their deployment. The arrays are drawing power, and early data suggests good performance. The next milestone will be a perigee raise maneuver targeted for approximately 2:41 a.m. EST to raise Orion’s orbit in preparation for the critical trans-lunar injection that will send Orion to the Moon.


Update from Nov. 16, 2022 — “Core stage main engine cutoff, core stage separation complete”

1:56 am — Space Launch System core stage main engine cutoff is complete, and the core stage has separated from the interim cryogenic propulsion stage and Orion spacecraft. The next milestone is deployment of Orion’s solar arrays, scheduled to begin approximately 18 minutes after launch.


Update from Nov. 16, 2022 — “Service module fairing jettison, launch abort system jettison complete”

1:51 am — The service module fairing and launch abort system have successfully separated from the Orion spacecraft. The SLS core stage will continue to fire until about 8 minutes after launch.


Update from Nov. 16, 2022 — “Solid Rocket Booster separation complete”

1:50 am — The Space Launch System’s (SLS) solid rocket boosters have successfully jettisoned. The SLS core stage will continue to fire until 8 minutes after launch. In about one minute, the service module fairing and launch abort system will separate from the Orion spacecraft.


Update from Nov. 16, 2022 — “Artemis I Liftoff”

1:47 am — NASA’s Space Launch System rocket, carrying the uncrewed Orion spacecraft lifted off from Launch Complex 39B in Florida at 1:47 a.m. EST.

The primary goal of Artemis I is to thoroughly test the integrated systems before crewed missions by operating the spacecraft in a deep space environment, testing Orion’s heat shield, and recovering the crew module after reentry, descent, and splashdown.

 Below are the ascent milestones that will occur over the next two hours. Times may vary by several seconds.

  • Solid rocket booster separation (Mission Elapsed Time 00:02:12)
  • Service module fairing jettison (MET 00:03:11)
  • Launch abort system jettison (MET 00:03:16)
  • Core stage main engine cutoff commanded (MET 00:08:03)
  • Core stage/ICPS separation (MET 00:08:15)
  • Orion solar array wing deploy begins (MET 00:18:09) – approx. 12 min duration
  • Perigee raise maneuver (MET 00:52:56)
  • Trans-lunar injection (MET 01:29:27)
  • Orion/ICPS separation (MET 01:57:36)

Update from Nov. 16, 2022 — “Launch Managers Give “Go” to Proceed with Terminal Count, Launch Set for 1:47 a.m.”

1:38 am — The mission management team has polled “go” to proceed with the terminal count sequence. The launch director is also “go” and teams have set a new target launch time of 1:47 a.m. EST and the countdown clock  resumed at 1:37 a.m.

With approval from the launch director and managers, a series of countdown milestones for the Artemis I terminal count to launch will be initiated by the Ground Launch Sequencer at T-10 minutes:

  • Ground Launch Sequencer (GLS) initiates terminal count (T-10M)
  • GLS go for core stage tank pressurization (T-6M)
  • Orion ascent pyros are armed (T-6M)
  • Orion set to internal power (T-6M)
  • Core Stage LH2 terminate replenish (T-5M57S)
  • GLS is go for flight termination system (FTS) arm (T-5M)
  • GLS is go for LH2 high flow bleed check (T-4M40S)
  • GLS is go for core stage auxiliary power unit (APU) start (T-4M)
  • Core Stage auxiliary power unit starts (T-4M)
  • Core stage L0X terminate replenish (T-4M)
  • ICPS LOX terminate replenish (T-3M30S)
  • GLS is go for purge sequence 4 (T-3M10S)
  • ICPS switches to internal battery power (T-1M56S)
  • Core stage switches to internal power (T-1M30S)
  • ICPS enters terminal countdown mode (T-1M20S)
  • ICPS LH2 terminate replenish (T-50S)
  • GLS sends “Go for automated launch sequencer” command (T-33S)
  • Core stage flight computer to automated launching sequencer (T-30S)
  • Hydrogen burn off igniters initiated (T-12S)
  • GLS sends the command for core stage engine start (T-10S)
  • RS-25 engines startup (T-6.36S)

Liftoff (T-0)

  • Solid rocket booster separation (Mission Elapsed Time 00:02:12)
  • Service module fairing jettison (MET 00:03:11)
  • Launch abort system jettison (MET 00:03:16)
  • Core stage main engine cutoff commanded (MET 00:08:03)
  • Core stage/ICPS separation (MET 00:08:15)
  • Orion solar array wing deploy begins (MET 00:18:09) – approx. 12 min duration
  • Perigee raise maneuver (MET 00:52:56)
  • Trans-lunar injection (MET 01:29:27)
  • Orion/ICPS separation (MET 01:57:36)

The timing of events after liftoff may vary by a few seconds.


Update from Nov. 16, 2022 — “Teams to Target New Launch Time”

1:02 am — Teams have extended their planned 30-minute hold, and mission managers are expected to target a new time for launch. The Eastern Range and launch teams have since resolved an issue that caused a loss of signal from a radar site and are currently in the process of conducting required tests to ensure communication and tracking of the rocket and spacecraft.


Update from Nov. 15, 2022 — “Core Stage Liquid Hydrogen Back in Replenish, Upper Stage in Fast Fill”

11:55 pm — Teams are replenishing liquid hydrogen into the core stage and report seeing good data where a red crew tightened connections in the area of a leaky valve on the mobile launcher. The leak is not reoccurring. Engineers are back into liquid hydrogen fast fill operations on the interim cryogenic propulsion stage.

Engineers also are tracking the loss of signal from a radar site required for launch. The Range is in the process of troubleshooting it while launch operations continue.


Update from Nov. 15, 2022 — “Red Crew Departs Pad”

11:08 pm — The red crew has departed the launch pad and is now outside the designated danger area surrounding the pad. The technicians entered the zero deck, or base, of the mobile launcher and tightened several bolts to troubleshoot a valve used to replenish the core stage with liquid hydrogen which showed a leak with readings above limits. The launch team will check the valves to determine if the leak has been fixed and resume launch countdown operations.


Update from Nov. 15, 2022 — “Red Crew Arrives at Pad”

10:12 pm — Technicians who are part of the “red crew” of personnel specially trained to conduct operations at the launch pad during cryogenic loading operations have arrived at the launch pad. They will enter the zero deck or base of the mobile launcher to tighten connections to ensure a hydrogen valve used to replenish the core stage remains tight.

NASA has historically sent teams to the pad to conduct inspections during active launch operations as needed.


Update from Nov. 15, 2022 — “Core Stage Liquid Hydrogen Flow Paused, Red Crew Being Assembled”

9:34 pm — Engineers have paused flowing liquid hydrogen into the core stage because of a small leak on a hydrogen valve inside of the mobile launcher. A team of personnel called a red crew is being assembled to go to the pad to make sure all of the connections and valves remain tight. The valve is located within the base of the mobile launcher.


Update from Nov. 15, 2022 — “Upper Stage Liquid Hydrogen and Liquid Oxygen in Fast Fill”

8:24 pm — Teams are in fast fill operations for the interim cryogenic propulsion stage’s (ICPS) liquid hydrogen and liquid oxygen tanks. The ICPS is the upper stage of the Space Launch System rocket responsible for giving the Orion spacecraft the big push it needs in space to head toward the Moon.

Teams continue to work toward a two-hour launch window that opens at 1:04 a.m. EST, from Launch Pad 39B at NASA’s Kennedy Space Center in Florida.

Coverage of tanking operations continues on NASA TV and the agency’s website and the NASA app. A full launch broadcast will begin at 10:30 p.m. EST in English and at midnight, Spanish coverage begins on the NASA en español YouTube page.


Update from Nov. 15, 2022 — “Core Stage Liquid Oxygen in Replenish, Upper Stage Tanking to Begin”

7:46 pm — Engineers have completed filling the core stage liquid oxygen tank and have moved into the replenish phase. Teams are beginning operations to load liquid hydrogen into the rocket’s interim cryogenic propulsion stage.


Update from Nov. 15, 2022 — “Core Stage Liquid Hydrogen in Replenish”

6:44 pm — Engineers have completed filling the core stage liquid hydrogen tank, and have moved into the replenish phase. Core stage liquid oxygen fast fill is still underway. Although the LH2 tank is larger than the LOX tank, LOX is denser than LH2 and takes longer to load.

Teams continue to work toward a two-hour launch window that opens at 1:04 a.m. EST, from Launch Pad 39B at NASA’s Kennedy Space Center in Florida.


Update from Nov. 15, 2022 — “Core Stage Liquid Oxygen and Liquid Hydrogen Fast Fill Underway”

5:10 pm — Fast fill operations are underway for the Space Launch System rocket’s core stage liquid oxygen and liquid hydrogen tanks.


Update from Nov. 15, 2022 — “Core Stage Propellant Loading Underway”

4:40 pm — Teams have begun the slow fill phase to load liquid hydrogen (LH2)  and liquid oxygen (LOX) into the Space Launch System rocket’s core stage. Once LH2 and LOX slow fill is complete, teams will transition to fast fill operations.

Below are the as scheduled times for slow and fast fill operations:

  • 4:24 p.m.: Core stage LH2 slow fill start (L-8H45M – L-7H50M)
  • 4:44 p.m.: Core stage LOX slow fill (L-8H20M – L-8H5M)
  • 5:04 p.m.: Core stage LOX fast fill (L-8H5M – L-5H15M)
  • 5:14 p.m.: Core stage LH2 fast fill (L-7H50M – L-6H10M)

Update from Nov. 15, 2022 — “Launch Director Gives “Go” to Begin Tanking Operations for Artemis I”

3:22 pm — Artemis Launch Director Charlie Blackwell-Thompson has given the “go” to officially begin loading propellants into the Space Launch System rocket. Tanking begins with chilldown of the core stage liquid oxygen and liquid hydrogen transfer lines.


Update from Nov. 15, 2022 — “Mission Managers Give “Go” to Proceed Toward Tanking Operations for Artemis I”

2:47 pm — The Artemis I mission management team met today to review the status of operations and has given the “go” to proceed toward tanking operations. Weather conditions are 80% favorable for the two-hour launch window which opens at 1:04 a.m. EST Nov. 16, with the primary concern being the potential for thick clouds.

Launch director Charlie Blackwell-Thompson is expected to give the “go” shortly to officially begin propellant loading operations. During tanking operations, teams will load the Space Launch System (SLS) rocket with liquid oxygen (LOX) and liquid hydrogen (LH2), beginning with the rocket’s core stage and then the interim cryogenic propulsion stage.

Tanking begins with chilling down the LOX and LH2 lines for the core stage.  In sequential fashion, LOX and LH2 will flow into the rocket’s core stage tank and be topped off and replenished as some of the cryogenic propellant boils off. The process involves slowly filling the core stage with propellant to thermally condition the tank until temperature and pressure are stable before beginning fast fill operations, which is when the tank is filled at a quicker pump speed. As the super cold liquid oxygen fills the core stage tank, some venting may be visible.

At 3:30 p.m., NASA TV coverage begins with commentary of tanking operations to load propellant into the SLS rocket. Full coverage begins at 10:30 p.m. in English and at midnight Wednesday, Spanish coverage begins on NASA en español YouTube page.

Below are the countdown milestones as planned for tanking:

  • Core stage LOX transfer line chilldown (L-9H15M – L-9H)
  • Core stage LH2 transfer line chilldown (L-9H15M – L-8H45M)
  • Core stage LOX main propulsion system chilldown (L-9H – L-8H20M)
  • Core stage LH2 slow fill start (L-8H45M – L-7H50M)
  • Core stage LOX slow fill (L-8H20M – L-8H5M)
  • Core stage LOX fast fill (L-8H5M – L-5H15M)
  • Core stage LH2 fast fill (L-7H50M – L-6H10M)
  • Engine bleed kick start (L-7H40M – L-7H20M)
  • Core stage LH2 topping (L-6H10M – L6H5M)
  • Core stage LH2 replenish (L-6H5M – launch)
  • Core stage LOX topping (L-5H15M– L-5H5M)
  • ICPS LH2 ground support equipment and tank chilldown (L-5H20M – L-5H)
  • Core stage LOX replenish (L-5H5M – launch)
  • ICPS LOX main propulsion system chilldown (L-5H5M– L-4H45M)
  • ICPS LH2 fast fill start (L-5H5M – L4H5M)
  • Orion communications system activated (RF to mission control) (L-4H20M – L-3H45M)
  • ICPS LOX fast fill (L-4H55M– L-4H10M)
  • ICPS LOX validation and leak test (L-4H10M – L-3H40M)
  • ICPS LH2 validation and leak test (L-4H – L-3H40M)
  • ICPS LH2 tank topping start (L-3H40M – L-3H25M)
  • ICPS LH2 replenish (L-3H25M – launch)
  • ICPS LOX topping (L-3H40M – L-3H20M)
  • ICPS LOX replenish (L-3H20M – launch)
  • ICPS/Space Launch System telemetry data verified with Mission Control Center and SLS Engineering Support Center (L-2H55M – L-2H45M)
  • ICPS LOX validation and leak test (L-2H55M – L-2H30M)
  • ICPS LH2 replenish (L-2H50M – launch)
  • ICPS LOX topping (L-2H30M – L-2H10M)
  • ICPS LOX replenish (L-2H10M – launch)
  • ICPS/Space Launch System (SLS) telemetry data verified with Mission Control Center and SLS Engineering Support Center (L-3H – L-2H50M)
  • Final NASA Test Director briefing is held (L-50M)
  • Built in 30-minute countdown hold begins (L-40M)
  • The launch director polls the team to ensure they are “go” for launch
  • Ground Launch Sequencer (GLS) initiates terminal count (T-10M)
  • GLS go for core stage tank pressurization (T-6M)
  • Orion ascent pyros are armed (T-6M)
  • Orion set to internal power (T-6M)
  • Core stage LH2 terminate replenish (T-5M57S)
  • GLS is go for flight termination system (FTS) arm (T-5M)
  • GLS is go for LH2 high flow bleed check (T-4M40S)
  • GLS is go for core stage auxiliary power unit (APU) start (T-4M)
  • Core Stage APU starts (T-4M)
  • Core stage LOX terminate replenish (T-4M)
  • ICPS LOX terminate replenish (T-3M30S)
  • GLS is go for purge sequence 4 (T-3M10S)
  • ICPS switches to internal battery power (T-1M56S)
  • Core stage switches to internal power (T-1M30S)
  • ICPS enters terminal countdown mode (T-1M20S)
  • ICPS LH2 terminate replenish (T-50S)
  • GLS sends “go for automated launch sequencer” command (T-33S)
  • Core stage flight computer to automated launching sequencer (T-30S)
  • Hydrogen burn off igniters initiated (T-12S)
  • GLS sends the command for core stage engine start (T-10S)
  • RS-25 engines startup (T-6.36S)
  • T-0: Booster ignition, umbilical separation, and liftoff

Update from Nov. 14, 2022 — “Managers Give “Go” to Proceed Toward Launch, Countdown Progressing”

8:05 pm — Artemis I managers convened Monday afternoon to review the status of countdown operations as well as two open technical items, and gave a “go” to proceed toward launch Wednesday, Nov 16. The two-hour window for launch opens at 1:04 a.m. EST.

Engineers examined detailed analysis of caulk on a seam between an ogive on Orion’s launch abort system and the crew module adapter and potential risks if it were to detach during launch. The mission management team determined there is a low likelihood that if additional material tears off it would pose a critical risk to the flight.

Technicians also completed replacing a component of an electrical connector on the hydrogen tail service mast umbilical. While swapping the component did not fully fix the issue, engineers have redundant sources of information supplied through the connector.

The countdown, which began Monday at 1:54 a.m., is progressing smoothly. All elements of the rocket and spacecraft are powered up. Overnight, teams will charge flight batteries, conduct final walkdowns at the launch pad, and check out communications with Orion.

The following milestones remaining in the countdown are below. Live coverage of tanking operations with commentary on NASA TV will begin on Tuesday, Nov. 15 at 3:30 p.m. Full launch coverage in English will begin at 10:30 p.m.

L-32 hours and counting 

  • Core stage composite overwrapped pressure vessel (COPV) Pressurization to Flight Pressure (L-32M – L-23H)
  • The ICPS is powered down (L-31H – L-30H30M)
  • Charge Orion flight batteries to 100% (L-31H – L-27H)
  • Charge core stage flight batteries (L-28H – L-22H)
  • The ICPS is powered-up for launch (L-19H30M – L-16H30M)

L-15 hours and counting 

  • All non-essential personnel leave Launch Complex 39B (L-13H – L-11H)
  • Ground Launch Sequencer (GLS) activation (L-11H15M – 10H15M)
  • Air-to-gaseous nitrogen (GN2) changeover and vehicle cavity inerting (L-11H45M – launch)

L-10 hours, 40 minutes and counting

  • 3.5-hour built in countdown hold begins (L-10H40M – L-7H10M)
  • Launch team conducts a weather and tanking briefing (L-10H40M – L-9H50M)
  • Launch team decides if they are “go” or “no-go” to begin tanking the rocket (L-9H40M)
  • Core stage LOX transfer line chilldown (L-9H15M – L-9H)
  • Core stage LH2 transfer line chilldown (L-9H15M – L-8H45M)

L-8 hours and counting

  • Core stage LOX main propulsion system chilldown (L-9H – L-8H20M)
  • Core stage LH2 slow fill start (L-8H45M – L-7H50M)
  • Core stage LOX slow fill (L-8H20M – L-8H5M)
  • Core stage LOX fast fill (L-8H5M – L-5H15M)
  • Core stage LH2 fast fill (L-7H50M – L-6H10M)
  • Engine bleed kick start (L-7H40M – L-7H20M)
  • Core stage LH2 topping (L-6H10M – L6H5M)
  • Core stage LH2 replenish (L-6H5M – launch)
  • Core stage LOX topping (L-5H15M– L-5H5M)
  • ICPS LH2 ground support equipment and tank chilldown (L-5H20M – L-5H)

L-5 hours and counting 

  • Core stage LOX replenish (L-5H5M – launch)
  • ICPS LOX main propulsion system chilldown (L-5H5M– L-4H45M)
  • ICPS LH2 fast fill start (L-5H5M – L4H5M)
  • Orion communications system activated (RF to mission control) (L-4H20M – L-3H45M)
  • ICPS LOX fast fill (L-4H55M– L-4H10M)
  • ICPS LOX validation and leak test (L-4H10M – L-3H40M)
  • ICPS LH2 validation and leak test (L-4H – L-3H40M)
  • ICPS LH2 tank topping start (L-3H40M – L-3H25M)
  • ICPS LH2 replenish (L-3H25M – launch)
  • ICPS LOX topping (L-3H40M – L-3H20M)
  • ICPS LOX replenish (L-3H20M – launch)
  • ICPS/Space Launch System telemetry data verified with Mission Control Center and SLS Engineering Support Center (L-2H55M – L-2H45M)
  • ICPS LOX validation and leak test (L-2H55M – L-2H30M)
  • ICPS LH2 replenish (L-2H50M – launch)
  • ICPS LOX topping (L-2H30M – L-2H10M)
  • ICPS LOX replenish (L-2H10M – launch)
  • ICPS/Space Launch System (SLS) telemetry data verified with Mission Control Center and SLS Engineering Support Center (L-3H – L-2H50M)

L-50 minutes and counting

  • Final NASA Test Director briefing is held (L-50M)

L-40 minutes and holding 

  • Built in 30-minute countdown hold begins (L-40M)

L-15 minutes and holding  

  • The launch director polls the team to ensure they are “go” for launch

T-10 minutes and counting 

  • Ground Launch Sequencer (GLS) initiates terminal count (T-10M)
  • GLS go for core stage tank pressurization (T-6M)
  • Orion ascent pyros are armed (T-6M)
  • Orion set to internal power (T-6M)
  • Core stage LH2 terminate replenish (T-5M57S)
  • GLS is go for flight termination system (FTS) arm (T-5M)
  • GLS is go for LH2 high flow bleed check (T-4M40S)
  • GLS is go for core stage auxiliary power unit (APU) start (T-4M)
  • Core Stage APU starts (T-4M)
  • Core stage LOX terminate replenish (T-4M)
  • ICPS LOX terminate replenish (T-3M30S)
  • GLS is go for purge sequence 4 (T-3M10S)
  • ICPS switches to internal battery power (T-1M56S)
  • Core stage switches to internal power (T-1M30S)
  • ICPS enters terminal countdown mode (T-1M20S)
  • ICPS LH2 terminate replenish (T-50S)
  • GLS sends “go for automated launch sequencer” command (T-33S)
  • Core stage flight computer to automated launching sequencer (T-30S)
  • Hydrogen burn off igniters initiated (T-12S)
  • GLS sends the command for core stage engine start (T-10S)
  • RS-25 engines startup (T-6.36S)

T-0

  • Booster ignition, umbilical separation, and liftoff

Update from Nov. 14, 2022 — “Weather Forecast Remains 90% Favorable for Artemis I Launch”

11:25 am — Weather conditions remain 90% favorable for the Artemis I launch based on the Monday, Nov. 14 forecast from meteorologists with the U.S. Space Force Space Launch Delta 45. Liftoff is scheduled for 1:04 a.m. EST Wednesday, Nov. 16 with a two-hour launch window.

The mission management team will reconvene this afternoon to review additional analysis from overnight operations in preparation for launch. NASA is targeting a teleconference at 6 p.m. to discuss the outcome of the meeting.


Update from Nov. 13, 2022 — “Managers Proceed Toward Nov. 16 Launch, to Meet Monday”

10:01 pm — The Artemis I mission management team met Sunday evening to review the status of preparations for launch and gave a “go” to proceed toward a Nov. 16 launch attempt. The team will meet again Monday afternoon to review additional analysis associated with caulk on Orion’s launch abort system that came loose during Hurricane Nicole. The two-hour window for launch opens at 1:04 a.m. EST Wednesday. The countdown clock will begin at 1:54 a.m. Monday.

Within the next day, engineers will conduct detailed analysis of several feet of delaminated caulk where the ogive on Orion’s launch abort system meets the crew module adapter. The analysis will assess risk should it come loose during launch.

Overnight, in parallel with launch preparations, technicians also will remove and replace a component of an electrical connector on the hydrogen tail service mast umbilical ground-side plate. Engineers continue to see some inconsistent data provided through the connector, despite replacing the cable to the connector earlier in the week. Engineers have redundant sources for the information provided through the connector and it is not an impediment to launch.

NASA will provide a prelaunch status update Monday afternoon after the mission management team reconvenes.

Live coverage of tanking operations with commentary on NASA TV will begin on Tues., Nov. 15 at 3:30 p.m. EST. Full launch coverage in English will begin at 10:30 p.m. and NASA en espanol broadcast coverage will begin at 12 a.m. Wednesday.


Update from Nov. 13, 2022 — “CAPSTONE Arrives to Orbit at the Moon”

8:41 pm — The CAPSTONE mission operations team confirmed that NASA’s CAPSTONE spacecraft arrived at its orbit at the Moon Sunday evening. The CubeSat completed an initial orbit insertion maneuver, firing its thrusters to put the spacecraft into orbit, at 7:39 p.m. EST.

CAPSTONE is now in a near-rectilinear halo orbit, or NRHO. This particular NRHO is the same orbit that will be used by Gateway, the Moon-orbiting space station that will support NASA’s Artemis missions. CAPSTONE is the first spacecraft to fly an NRHO, and the first CubeSat to operate at the Moon.

In the next five days, CAPSTONE will perform two additional clean-up maneuvers to refine its orbit. After these maneuvers, the team will review data to confirm that CAPSTONE remains on track in the NRHO.


Update from Nov. 13, 2022 — “Weather Forecast 90% Favorable for Artemis I Launch”

4:05 pm — Meteorologists with the U.S. Space Force Space Launch Delta 45 currently predict 90% favorable weather conditions for the Artemis I launch targeted for Nov. 16. Liftoff is scheduled for 1:04 a.m. EST with a two-hour launch window.

The mission management team will meet this afternoon to review the status of preparations for launch. NASA will host a teleconference at 7 p.m. to discuss the outcome following the meeting.


Update from Nov. 11, 2022 — “Teams Conduct Check-outs, Preparations Ahead of Next Artemis I Launch Attempt”

5:21 pm — NASA continues to target launch of its Artemis I mission from the agency’s Kennedy Space Center in Florida at 1:04 a.m. EST, Wednesday, Nov. 16. There is a two-hour launch window for the agency’s first integrated flight test of its Space Launch System (SLS) rocket and Orion spacecraft.

Teams conducted thorough assessments at Launch Complex 39B beginning Thursday evening, closely inspecting SLS, Orion, mobile launcher, and other pad-related assets to confirm there were no significant impacts from Hurricane Nicole, which made landfall more than 70 miles south of the launch pad. The physical inspections augmented remote monitoring via sensors and high-resolution cameras performed during the storm by a team in a safe location at Kennedy.

Space Launch System engineers have performed detailed analysis to confirm the sustained and peak winds experienced during the storm have no adverse effect on the structural strength of the rocket. While varying peak winds were measured by sensors at different heights at the pad, all measurements remained below 75% of SLS design limits, which also are intentionally conservative. Data from testing with actual hardware during the structural test series and modal testing, as well as other evaluations and modeling, provide confidence there is margin beyond the design ratings.

Technicians also are working to fix several minor items from the storm. Most repairs involve loose caulk or weather coverings. An umbilical used to provide purge air, or proper environmental conditions to the Orion spacecraft, was out of position. The umbilical maintained purge throughout the storm and has been repositioned to allow proper retraction at liftoff. Engineers have also removed the hard cover over the launch abort system window installed before the storm and will inspect the window to confirm it is in good condition for launch.

Today, as part of normal launch preparation, engineers are in the process of powering up rocket and spacecraft elements to confirm all systems are healthy. Powered health checks will continue until Saturday. Engineers plan to conduct the standard final software and hardware-related tests required before launch, on Sunday. The Artemis I mission management team will convene Sunday afternoon to review the preparations for launch.


UPDATE from Nov. 8, 2022 — “NASA Prepares Rocket, Spacecraft Ahead of Tropical Storm Nicole, Re-targets Launch”

5:47 pm — “NASA is continuing to monitor Tropical Storm Nicole and has decided to re-target a launch for the Artemis I mission for Wednesday, Nov. 16, pending safe conditions for employees to return to work, as well as inspections after the storm has passed. Adjusting the target launch date will allow the workforce to tend to the needs of their families and homes, and provide sufficient logistical time to get back into launch status following the storm.”

“Kennedy currently is in a HURCON (Hurricane Condition) III status, which includes securing facilities, property and equipment at the center, as well as briefing and deploying the “ride-out” team. As part of NASA’s hurricane preparedness protocol, a “ride-out” team includes a set of personnel who will remain in a safe location at Kennedy throughout the storm to monitor centerwide conditions, including the flight hardware for the Artemis I mission. Kennedy will release non-essential personnel at the HURCON II status as the agency continues to prioritize its employees in the Kennedy area.”

“Based on expected weather conditions and options to roll back ahead of the storm, the agency determined Sunday evening the safest option for the launch hardware was to keep the Space Launch System (SLS) rocket and Orion spacecraft secured at the pad.”

“The SLS rocket is designed to withstand 85 mph (74.4 knot) winds at the 60-foot level with structural margin. Current forecasts predict the greatest risks at the pad are high winds that are not expected to exceed the SLS design. The rocket is designed to withstand heavy rains at the launch pad and the spacecraft hatches have been secured to prevent water intrusion.”

“In preparation for the storm, teams have powered down the Orion spacecraft, SLS core stage, interim cryogenic propulsion stage, and boosters. Engineers have also installed a hard cover over the launch abort system window, retracted and secured the crew access arm on the mobile launcher and configured the settings for the environmental control system on the spacecraft and rocket elements. Teams also are securing nearby hardware and performing walkdowns for potential debris in the area.”

“Teams are poised to resume work as soon as weather and Kennedy center status allows. Once back on-site, technicians will perform walkdowns and inspections at the pad to assess the status of the rocket and spacecraft as soon as practicable.”

“A launch during a two-hour window that opens at 1:04 a.m. EST on Nov. 16 would result in a splashdown on Sunday, Dec. 11. If needed, NASA has a back-up launch opportunity on Saturday, Nov. 19, and will coordinate with the U.S. Space Force for additional launch opportunities.”

“The agency continues to rely on the most up to date information from the National Oceanic and Atmospheric Administration, U.S. Space Force, and the National Hurricane Center throughout its evaluations and continues to closely monitor conditions for the Kennedy area.”


UPDATE from Nov. 7, 2022 — “NASA monitoring Subtropical Storm Nicole, Space Launch System rocket and Orion to remain at Launch Pad 39B”

5:40 pm — “NASA is working with U.S. Space Force and the National Hurricane Center to monitor Subtropical Storm Nicole. NASA’s Kennedy Space Center in Florida is currently in a HURCON (Hurricane Condition) IV status, which includes implementing checklists and preparations for the storm as the agency continues to prioritize its employees in the Kennedy area. Based on current forecast data, managers have determined the Space Launch System rocket and Orion will remain at Launch Pad 39B. Teams at Kennedy will continue to monitor the weather, make sure all personnel are safe, and will evaluate the status of the Monday, Nov. 14, launch attempt for the Artemis I mission as we proceed and receive updated predictions about the weather.”


UPDATE from Nov. 4, 2022 — “Artemis I Moon Rocket Arrives at Launch Pad Ahead of Historic Mission”

8:57 am — “Around 8:30 a.m. EDT on Nov. 4, the Space Launch System rocket and Orion spacecraft for the Artemis I mission arrived at launch pad 39B at NASA’s Kennedy Space Center in Florida after a nearly nine-hour journey from the Vehicle Assembly Building. Teams will continue working to configure SLS and Orion for the upcoming Nov. 14. launch attempt.”


UPDATE from Oct. 3, 2022 — “NASA’s Mega Moon Rocket Begins Roll to Launch Pad”

11:22 pm — “The Space Launch System rocket and Orion spacecraft for the Artemis I flight test are rolling to launch pad 39B at NASA’s Kennedy Space Center in Florida ahead of launch. At about 11:17 p.m. EDT the crawler-transporter began the approximately 4-mile journey from the Vehicle Assembly Building (VAB) to the launch pad.”

“Once outside the VAB high-bay doors, the Moon rocket will make a planned pause allowing the team to reposition the crew access arm on the mobile launcher before continuing to the launch pad. The journey is expected to take between eight to 12 hours. NASA will provide an update once the rocket has arrived at the pad. A live stream view of the rocket and spacecraft departing VAB and arriving at the launch pad is available on the Kennedy Newsroom YouTube Channel.”

“Launch is currently targeted for Nov. 14 at the opening of a 69-minute launch window starting at 12:07 a.m. EST.”


UPDATE from Oct. 28, 2022 — “Teams On Track for Artemis I Rollout to Launch Pad”

4:24 pm — “Teams are on track to roll the Space Launch System rocket and Orion spacecraft from the Vehicle Assembly Building (VAB) to Launch Pad 39B no earlier than Friday, Nov. 4 with first motion targeted for 12:01 a.m. EDT.”

“Minor repairs identified through detailed inspections are mostly completed. Preparations are underway to ready the mobile launcher and VAB for rollout by configuring the mobile launcher arms and umbilicals and continuing to retract the access platforms surrounding SLS and Orion as work is completed.”

“Testing of the reaction control system on the twin solid rocket booters, as well as the installation of the flight batteries, is complete and those components are ready for flight. Engineers also have replaced the batteries on the interim cryogenic propulsion stage (ICPS), which was powered up for a series of tests to ensure the stage is functioning properly. Teams successfully completed final confidence checks for the ICPS, launch vehicle stage adapter and the core stage forward skirt.”

“Teams are continuing to work in the intertank area of the core stage and upper section of the boosters to replace batteries. These areas will remain open to support remaining battery and flight termination system activities. Flight termination system testing will start next week on the intertank and booster and once complete, those elements will be ready for launch. Charging of the secondary payloads in the Orion stage adapter is complete.”

“Teams recharged, replaced and reinstalled several of the radiation instruments and the crew seat accelerometer inside Orion ahead of the crew module closure for roll. Technicians will refresh the specimens for the space biology payload at the launch pad. The crew module and launch abort system hatches are closed for the roll to the pad, and engineers will perform final closeouts at the pad prior to launch.”

“Teams will plan to move the crawler transporter into position outside of the VAB ahead of rolling into the facility early next week. The agency continues to target a launch date no earlier than Nov. 14 at 12:07 a.m. EDT.”


UPDATE from Oct. 12, 2022 — “NASA Sets Date for Next Launch Attempt for Artemis I Moon Mission”

At 5:47 pm EDT — “NASA is targeting the next launch attempt of the Artemis I mission for Monday, Nov. 14 with liftoff of the Space Launch System (SLS) rocket carrying the Orion spacecraft planned during a 69-minute launch window that opens at 12:07 a.m. EST. Artemis I is an uncrewed flight test to launch SLS and send Orion around the Moon and back to Earth to thoroughly test its system before flights with astronauts.”

“Inspections and analyses over the previous week have confirmed minimal work is required to prepare the rocket and spacecraft to roll out to Launch Pad 39B at Kennedy Space Center in Florida following the roll-back due to Hurricane Ian. Teams will perform standard maintenance to repair minor damage to the foam and cork on the thermal protection system and recharge or replace batteries on the rocket, several secondary payloads, and the flight termination system. The agency plans to roll the rocket back to the launch pad as early as Friday, Nov. 4.

“NASA has requested back-up launch opportunities for Wednesday, Nov. 16, at 1:04 a.m. and Saturday, Nov. 19, at 1:45 a.m., which are both two-hour launch windows. A launch on Nov. 14 would result in a mission duration of about 25-and-a-half days with a splashdown in the Pacific Ocean Friday, Dec. 9.”


UPDATE from Oct. 6, 2022 — “Inspections Underway for Rocket, Spacecraft Before Setting Launch Date”

At 5:47 pm EDT — “Engineers at NASA’s Kennedy Space Center in Florida are in the process of preparing the Space Launch System (SLS) rocket and Orion spacecraft for the next launch attempt in November for the Artemis I mission. Check-outs conducted this week will allow NASA to finalize the work schedule before rolling SLS and Orion back to Launch Pad 39B.”

“Since resuming work after Hurricane Ian, teams have extended work platforms around SLS and Orion to assess the exterior and access internal components. Exterior inspections will note any foam or cork from the thermal protection system on the rocket or spacecraft that might need to be repaired. Teams will replace the flight batteries for the interim cryogenic propulsion stage and the boosters, as well as the batteries for the flight termination system in the boosters and core stage.”

“Work will also include charging the CubeSats that are equipped to be re-charged and have elected to do so. Inside Orion, work will include replenishing the specimens and batteries for the biology investigations riding within the capsule, as well as recharging the batteries associated with the crew seat accelerometers and space radiation experiments.”

“While teams inside the Vehicle Assemble Building complete check-outs, managers are coordinating with the U.S. Space Force to reserve launch dates on the Eastern Range and working with other parts of the agency to evaluate any potential constraints before NASA sets a target date for the next launch attempt.”

“Although the Kennedy area received minimal impacts from Hurricane Ian, many team members who live farther west experienced larger effects from the storm and are still recovering. Managers are working with teams to ensure they have the time and support needed to address the needs of their families and homes.”


UPDATE from Sept. 30, 2022 — “Teams Confirm No Damage to Flight Hardware, Focus on November for Launch”

At 4:46 pm EDT — “Teams at NASA’s Kennedy Space Center in Florida conducted initial inspections Friday to assess potential impacts from Hurricane Ian. There was no damage to Artemis flight hardware, and facilities are in good shape with only minor water intrusion identified in a few locations. Next, engineers will extend access platforms around the Space Launch System rocket and Orion spacecraft inside the Vehicle Assembly Building (VAB) to prepare for additional inspections and start preparation for the next launch attempt, including retesting the flight termination system.”

“As teams complete post-storm recovery operations, NASA has determined it will focus Artemis I launch planning efforts on the launch period that opens Nov. 12 and closes Nov. 27. Over the coming days, managers will assess the scope of work to perform while in the VAB and identify a specific date for the next launch attempt. Focusing efforts on the November launch period allows time for employees at Kennedy to address the needs of their families and homes after the storm and for teams to identify additional checkouts needed before returning to the pad for launch.”


UPDATE from Sept. 28, 2022 — “Teams Prepare for Hurricane Arrival, Assess Artemis I Forward Plan”

At 9:59 am EDT — “With the Artemis I Space Launch System rocket and Orion spacecraft safety in the Vehicle Assembly Building after rolling back from Launch Pad 39B Monday night, NASA continues to prioritize its employees as Hurricane Ian approaches the Kennedy Space Center area.”

“As part of NASA’s hurricane preparedness protocol, a “ride out” team will remain in a safe location at Kennedy throughout the storm to monitor centerwide conditions. After the storm passes, they will conduct an assessment of facilities, property, and equipment. Once it is safe for additional employees to return to Kennedy, engineers will extend platforms to establish access to the rocket and spacecraft.”

“Managers will review options on the extent of work that will be conducted in the VAB before returning to the launch pad or identifying the next opportunity for launch. Technicians will swap out batteries on the rocket’s flight termination system and retest the system prior to the next launch attempt.”


UPDATE from Sept. 27, 2022 — “Assessment Underway on Electrical System in Vehicle Assembly Building”

At 8:22 pm EDT — “At approximately 11:45 a.m. today, a fire alarm was triggered in the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. The notification came when an arc flash event occurred at a connector on an electrical panel in High Bay 3. A spark landed on a rope marking the boundary of the work area. The rope began to smolder, workers pulled the alarm, and employees evacuated the building safely.”

“The incident occurred on the third floor of F-tower at the Mobile Launcher power connection. Technicians shut down power to the panel, and the center’s emergency responders declared the VAB safe for employees to return to work. There were no reported injuries, and the Artemis I rocket and spacecraft were not at risk.”

“The Artemis I vehicle and mobile launcher entered High Bay 3 earlier this morning after rolling back from Launch Complex 39B in advance of Hurricane Ian, which is expected to bring sustained tropical storm force winds to Kennedy as early as Wednesday evening. Engineers and technicians are evaluating the cause.”


UPDATE from Sept. 27, 2022 — “NASA’s Moon Rocket and Spacecraft Arrive at Vehicle Assembly Building”

At 9:23 am EDT — “At approximately 9:15 a.m. EDT, NASA’s Space Launch System (SLS) rocket and Orion spacecraft for the Artemis I mission were secured inside the Vehicle Assembly Building at the agency’s Kennedy Space Center after a four-mile journey from Launch Pad 39B that began at 11:21 p.m. Monday, Sept. 26 ahead of the arrival of Hurricane Ian.”

“After the storm has passed, teams will conduct inspections to determine impacts at the center and establish a forward plan for the next launch attempt, including replacing the core stage flight termination system batteries and retesting the system to ensure it can terminate the flight if necessary for public safety in the event of an emergency during launch.”


UPDATE from Sept. 26, 2022 — “Artemis I Moon Rocket Departs Launch Pad 39B Ahead of Hurricane Ian”

At 11:29 pm EDT —At 11:21 p.m. ET Monday, NASA’s Artemis I Moon rocket left launch pad 39B atop the crawler-transporter and began its 4-mile trek to the Vehicle Assembly Building (VAB) at NASA’s Kennedy Space Center in Florida.”

“Managers decided to roll back based on the latest weather predictions associated with Hurricane Ian not showing improving expected conditions for the Kennedy area. The decision allows time for employees to address the needs of their families and protect the integrated rocket and spacecraft system.”


UPDATE from Sept. 26, 2022 — “NASA to Roll Artemis I Rocket and Spacecraft Back to VAB Tonight”

At 10:17 am EDT — “NASA will roll the Artemis I Space Launch System rocket and Orion spacecraft back to the Vehicle Assembly Building on Monday, Sept. 26. First motion is targeted for 11 p.m. EDT.”

“Managers met Monday morning and made the decision based on the latest weather predictions associated with Hurricane Ian, after additional data gathered overnight did not show improving expected conditions for the Kennedy Space Center area. The decision allows time for employees to address the needs of their families and protect the integrated rocket and spacecraft system. The time of first motion also is based on the best predicted conditions for rollback to meet weather criteria for the move.”

“NASA has continued to rely on the most up to date information from the National Oceanic and Atmospheric Administration, U.S. Space Force, and the National Hurricane Center throughout its evaluations and continues to closely monitor conditions for the Kennedy area.”


UPDATE from Sept. 25, 2022 — “Weather Monitoring and Rollback Preparations Continue”

At 9:11 pm EDT/6:41 am IST — “NASA continues to closely monitor the weather forecast associated with Tropical Storm Ian while conducting final preparations to allow for rolling back the Artemis I Space Launch System rocket and Orion spacecraft to the Vehicle Assembly Building.”

“Managers met Sunday evening to review the latest information on the storm from the National Oceanic and Atmospheric Administration, the U.S. Space Force, and the National Hurricane Center and decided to meet again Monday to allow for additional data gathering overnight before making the decision on roll back. NASA continues to prioritize its people while protecting the Artemis I rocket and spacecraft system.”


UPDATE from Sept. 25, 2022 — “NASA Closely Monitoring Weather While Rollback Preparations Continue”

At 10:53 am EDT/8:23 pm IST — “NASA continues to closely monitor the weather forecast associated with Tropical Storm Ian as preparations for rolling back the Space Launch System rocket and Orion spacecraft to the Vehicle Assembly Building continue. The agency is making incremental decisions that prioritize the agency’s people and hardware and its process is in accordance with established NASA policies for tropical storms and hurricanes.”

“The latest information provided by the National Oceanic and Atmospheric Administration, the U.S. Space Force, and the National Hurricane Center indicates a slower moving and potentially more westerly track of the storm than yesterday’s predictions showed, providing more time for the agency’s decision making process and for employees to prioritize their families should the storm impact the Kennedy Space Center area.”

“NASA managers will meet this evening to evaluate whether to roll back or remain at the launch pad to preserve an opportunity for a launch attempt on Oct. 2. The exact time of a potential rollback will depend on future weather predictions throughout the day and could occur Monday or very early Tuesday morning.”


UPDATE from Sept. 24, 2022 — “Artemis I Managers Wave Off Sept. 27 Launch, Preparing for Rollback”

At 9:56 am EDT/7:26 pm IST — “NASA is foregoing a launch opportunity Tuesday, Sept. 27, and preparing for rollback, while continuing to watch the weather forecast associated with Tropical Storm Ian. During a meeting Saturday morning, teams decided to stand down on preparing for the Tuesday launch date to allow them to configure systems for rolling back the Space Launch System rocket and Orion spacecraft to the Vehicle Assembly Building. Engineers deferred a final decision about the roll to Sunday, Sept. 25, to allow for additional data gathering and analysis. If Artemis I managers elect to roll back, it would begin late Sunday night or early Monday morning.”

“The agency is taking a step-wise approach to its decision making process to allow the agency to protect its employees by completing a safe roll in time for them to address the needs of their families while also protecting for the option to press ahead with another launch opportunity in the current window if weather predictions improve. NASA continues to rely on the most up to date information provided by the National Oceanic and Atmospheric Administration, U.S. Space Force, and the National Hurricane Center.”


UPDATE from Sept. 23, 2022 — “Teams Monitoring Weather While Protecting Option for Artemis I Launch”

At 7:54 pm EDT/5:24 am IST — “NASA is monitoring the forecast associated with the formation of a tropical depression in the Caribbean Sea while in parallel continuing to prepare for a potential launch opportunity on Tuesday, Sept. 27 during a 70-minute window that opens at 11:37 a.m. EDT.

“Managers are initiating activities on a non-interference basis to enable an accelerated timeline for rolling back to the Vehicle Assembly Building (VAB) to protect the rocket, should it be necessary. Discussions about whether to remain at the launch pad or roll back to the VAB are on-going and based on the latest forecast predictions. NASA will make a decision on whether to remain at the launch pad or roll back using incremental protocols to take interim steps necessary to protect people and hardware with a final decision anticipated no later than Saturday. The step-wise decision making process over the next day lets the agency protect its employees by completing a safe roll in time for them to address the needs of their families, while allowing flexibility to hold the launch window should weather predictions improve.”

“NASA is grateful to its agency partners at NOAA, United State Space Force and the National Hurricane Center for giving us the highest quality products to protect our nation’s flight test to return us to the Moon.”


UPDATE from Sept. 21, 2022 — “Artemis Cryogenic Demonstration Test Concludes, All Objectives Met”

At 4:59 pm EDT/2:29 am IST — “The launch director has confirmed all objectives have been met for the cryogenic demonstration test, and teams are now proceeding with critical safing activities and preparations for draining the rocket’s tanks. After encountering a hydrogen leak early in the loading process, engineers were able to troubleshoot the issue and proceed with the planned activities.”

“The four main objectives for the demonstration included assessing the repair to address the hydrogen leak identified on the previous launch attempt, loading propellants into the rocket’s tanks using new procedures, conducting the kick-start bleed, and performing a pre-pressurization test. The new cryogenic loading procedures and ground automation were designed to transition temperature and pressures slowly during tanking to reduce the likelihood of leaks that could be caused by rapid changes in temperature or pressure. After encountering the leak early in the operation, teams further reduced loading pressures to troubleshoot the issue and proceed with the demonstration test. The pre-pressurization test enabled engineers to calibrate the settings used for conditioning the engines during the terminal count and validate timelines before launch day to reduce schedule risk during the countdown on launch day.”

“Teams will evaluate the data from the test, along with weather and other factors, before confirming readiness to proceed into the next launch opportunity. The rocket remains in a safe configuration as teams assess next steps.”


UPDATE from Sept. 21, 2022 — “CAPSTONE Team Makes Progress Toward Recovery Operation”

At 4:09 pm EDT/1:39 am IST — “Over the past week, the CAPSTONE spacecraft was able to improve thermal conditions for the propellant and other critical systems while maintaining positive power generation. The operations team has been performing ground and spacecraft testing in preparation for an attempt to stop CAPSTONE’s spin. This operation would return the spacecraft to normal status and will be attempted when preparations and testing are complete.”


UPDATE from Sept. 21, 2022 — “Pre-Pressurization Test Complete”

At 4:03 pm EDT/1:33 am IST — “Launch controllers have completed the pre-pressurization test, obtaining pressure and temperature level readings as desired. Controllers are continuing with the procedures for today’s test, gathering additional data.”


UPDATE from Sept. 21, 2022 — “ICPS Liquid Hydrogen in Replenish, Teams Moving Ahead with Pre-Press Test”

At 3:37 pm EDT/1:07 am IST — “Launch controllers have reached the replenish phase of liquid hydrogen loading operations for the interim cryogenic propulsion stage of the Space Launch System rocket and are continuing operations to load liquid oxygen into the upper stage. Teams are moving into operations to conduct a pre-pressurization test, in which engineers will bring the core stage liquid hydrogen tank up to the pressure level it will experience just before launch while engineers calibrate the settings for conditioning the engines at a higher flow rate, as will be done during the terminal count on launch day. The pre-pressurization test is expected to last about an hour.”


UPDATE from Sept. 21, 2022 — “Liquid Hydrogen in Replenish, Teams Move Ahead with ICPS Loading”

At 1:35 pm EDT/11:05 pm IST — “The Space Launch System’s core stage liquid hydrogen tank is now full and is being replenished as some of the supercold propellant boils off. Since resuming liquid hydrogen fast fill operations, the rate of the hydrogen leak at the tail service mast umbilical quick disconnect has remained within allowable rates. The core stage liquid oxygen tank also is in the replenish phase.”

“Teams are pressing ahead with operations to load propellants into the interim cryogenic propulsion stage of the rocket. Once liquid hydrogen and liquid oxygen loading on the stage reach the replenish phase, the pre-press test, one of the objectives for today’s demonstration, will occur.”

“The pre-pressurization test will bring the core stage liquid hydrogen tank up to the pressure level it will experience just before launch while engineers calibrate the settings for conditioning the engines at a higher flow rate, as will be done during the terminal count on launch day.”


UPDATE from Sept. 21, 2022 — “Artemis Cryogenic Test: Core Stage LH2 Underway; LOX Fill and Engine Bleed Test Complete”

At 12:24 pm EDT/9:54 pm IST — “Fast fill continues for the Space Launch System (SLS) rocket’s core stage liquid hydrogen (LH2) tank at a reduced pressure as teams monitor the area where the hydrogen leak was detected. Fast fill is complete for the core stage liquid oxygen (LOX) tank and engineers have completed the engine bleed test, which flows supercold LH2 to the four RS-25 engines, bringing their temperature down to the conditions required for launch.”


UPDATE from Sept. 21, 2022 — “Liquid Hydrogen Filling Operations Resume”

At 11:40 am EDT/9:10 pm IST — “Teams have resumed the flow of liquid hydrogen into the core stage after warming up the quick disconnect, or interface where the fuel feed line connects to the rocket, to reseat the connection as part of their troubleshooting plan to fast fill the propellant.”


UPDATE from Sept. 21, 2022 — “Hydrogen Leak Detected During Slow Fill Operations”

At 10:14 am EDT/7:44 pm IST — “Launch controllers have detected a hydrogen leak in a cavity in the tail service mast umbilical and have stopped flowing the propellant to the rocket while they troubleshoot the issue. Engineers will warm up the quick disconnect, or interface where the fuel feed line connects to the rocket, to attempt to reseat it.”


UPDATE from Sept. 21, 2022 — “Artemis Cryogenic Test: Core Stage LOX Fast Fill Underway, Proceeding Toward LH2 Slow Fill”

At 9:13 am EDT/6:43 pm IST — “Fast fill is underway for the Space Launch System (SLS) rocket’s core stage liquid oxygen (LOX) tank. Next, teams will transition from slow fill to fast fill for the liquid hydrogen (LH2) tank and initiate, or “kick start,” the engine bleed, which will begin flowing supercold LH2 to start cooling the four RS-25 engines down to the temperature conditions required for launch.”


UPDATE from Sept. 21, 2022 — “Core Stage Liquid Oxygen Chilldown Complete, Slow Fill Underway”

At 8:47 am EDT/6:17 pm IST — “After chilling the lines for liquid oxygen (LOX), teams have begun the slow fill phase to load LOX into the Space Launch System (SLS) rocket’s core stage and have started chilling down the transfer line for the liquid hydrogen (LH2). Once LOX slow fill is complete, teams will transition to fast fill operations. Once the LH2 chilldown operations are complete, slow fill of liquid hydrogen will begin.”


UPDATE from Sept. 21, 2022 — “Launch Director Gives “Go” to Begin Cryogenic Operations, NASA TV Coverage Underway”

At 7:32 am EDT/5:02 pm IST — “Artemis Launch Director Charlie Blackwell-Thompson has given the “go” to officially begin loading propellants into the Space Launch System rocket as part of today’s Artemis I cryogenic demonstration test. Weather remains favorable for the test.”

“Tanking operations will begin with chilldown of the core stage liquid oxygen transfer line.”

NASA TV coverage is underway.


UPDATE from Sept. 20, 2022 — “Preparations Continue, Key Milestones for Artemis I Demonstration Test”

At 7:44 pm EDT/5:14 am IST — “As the countdown continued Tuesday toward the cryogenic demonstration test, teams conducted final closeouts at the pad and performed other preparations for the test. Work will continue through the night, and all non-essential personnel will leave Launch Pad 39B by 3:40 a.m. EDT Wednesday. The launch director is expected to give a “go” to begin loading cryogenic propellants into the rocket at approximately 7 a.m. Although the countdown clock is ticking down to a simulated liftoff time of 3:40 p.m., the test is planned to conclude around 3 p.m. after the teams have met the objectives and will not go into the terminal count phase of the launch countdown. Teams may extend the duration of the test should circumstances warrant it.”

“The launch countdown contains “L Minus” and “T Minus” times. “L minus” indicates how far away we are from liftoff in hours and minutes. “T minus” time is a sequence of events that are built into the launch countdown. Pauses in the countdown, or “holds,” are built into the countdown to allow the launch team to target a precise launch window, and to provide a cushion of time for certain tasks and procedures without impacting the overall schedule. During planned holds in the countdown process, the countdown clock is intentionally stopped and the T- time also stops. The L- time, however, continues to advance.”Below are some of the key events that take place at each milestone after the countdown begins.

  • L-9 hours, 40 minutes and counting
    • 6 a.m.: Built in countdown hold begins (L-9H40M – L-7H10M) 
    • 6 a.m.: Launch team conducts a weather and tanking briefing (L-9H40M – L-8H50M) 
    • 7 a.m.: Launch team decides if they are “go” or “no-go” to begin tanking the rocket (L-8H40M) 
    • 7:25 a.m. Core Stage LOX transfer line chilldown (L-8H15M – L-8H) 
  • L-8 hours and counting
    • 7:40 a.m.: Core stage LOX main propulsion system (MPS) chilldown (L-8H – L-7H20M) 
    • 8:20 a.m.: Core stage LOX slow fill (L-7H20M – L-7H5M) 
    • 8:20 a.m.: Core Stage LH2 transfer line chilldown (L-7H20M – L-7H10M) 
    • 8:30 a.m.: Core Stage LH2 slow fill start (L-7H10M – L-6H10M) 
    • 8:40 a.m.: Core Stage LOX fast fill (L-7H5M – L-4H15M) 
    • 9:30 a.m.: Core Stage LH2 fast fill (L-6H10M – L-5H5M) 
    • 9:40 a.m.: Engine bleed kick start (L-6H)
    • 10:20 a.m.: ICPS LH2 ground support equipment (GSE) and tank chilldown (L-5H20M – L-5H) 
    • 10:35 a.m.: Core Stage LH2 topping (L-5H5M – L-5H)
  • L-5 hours and counting
    • 10:40a.m.: Core Stage LH2 replenish (L-5H – cutoff) 
    • 10:40a.m.: Core stage 90-minute bleed valve timer start (L-5H)
    • 10:40a.m.: ICPS LH2 fast fill start (L-5H – L-4H) 
    • 11:25 a.m.: Core stage LOX topping (L-4H15M– L-4H) 
    • 11:40 a.m.: Core Stage LOX replenish (L-4H – cutoff) 
    • 11:40 a.m.: ICPS LOX MPS chilldown (L-4H– L-3H45M) 
    • 11:55 a.m.: ICPS LOX fast fill (L-3H45M– L-3H) 
    • 11:55 a.m.: ICPS LH2 tank topping start (L-3H45M – L-2H55M)
  • L-3 hours and counting
    • 12:15 p.m.: ICPS LH2 replenish (L-3H25M – cutoff) 
    • 12:50 p.m.: Core stage LH2 Pre-press test (L-2H50M) — approximately one hour
    • 1:10 p.m.: ICPS LOX topping (L-2H30M – L-2H10M) 
    • 1:30 p.m.: ICPS LOX replenish (L-2H10M – cutoff) 
    • 3 p.m.: Cutoff and critical safing (L-40M)

UPDATE from Sept. 19, 2022 — “Artemis I Cryogenic Demonstration Test on Track for Wednesday”

At 7:51 pm EDT/5:21 am IST — “NASA remains on track for an Artemis I cryogenic demonstration test on Wednesday, Sept. 21. In the days since the previous launch attempt, teams have analyzed the seals that were replaced on an interface for the liquid hydrogen fuel line between the Space Launch System (SLS) rocket and the mobile launcher and adjusted procedures for loading cryogenic, or supercold, propellants into the rocket. Engineers identified a small indentation found on the eight-inch-diameter liquid hydrogen seal that may have been a contributing factor to the leak on the previous launch attempt.”

“With new seals, updated cryogenic procedures, and additional ground software automation, teams are now preparing to demonstrate the updates under the same cryogenic conditions the rocket will experience on launch day. During the demonstration, the four main objectives include assessing the repair to address the hydrogen leak, loading propellants into the rocket’s tanks using the new procedures, conducting the kick-start bleed, and performing a pre-pressurization test.”

“Based on recent engineering assessments, the new cryogenic loading procedures and ground automation will transition temperatures and pressures more slowly during tanking to reduce the likelihood of leaks that could be caused by rapid changes in temperature or pressure. After the liquid hydrogen tank transitions from the slow fill phase to fast fill, teams will initiate, or “kick-start,” the flow of liquid hydrogen through the engines to begin conditioning, or chilling them down, for launch. After both tanks have reached the replenish phase, the pre-pressurization test will bring the liquid hydrogen tank up to the pressure level it will experience just before launch while engineers calibrate the settings for conditioning the engines at a higher flow rate, as will be done during the terminal count. Performing the pressurization test during the demonstration will enable teams to dial-in the necessary settings and validate timelines before launch day, reducing schedule risk during the launch countdown.”

“Call to stations for the demonstration occurred at 5 p.m. EDT Monday. The launch director is expected to give a “go” to begin loading cryogenic propellants into the rocket at approximately 7 a.m. Wednesday. The test is planned to conclude around 3 p.m. after the teams have met the objectives and will not go into the terminal count phase of the launch countdown. Teams may extend the duration of the test should circumstances warrant it.”

“During the test, teams will load propellants into both the core stage and upper stage tanks, and Orion and the SLS boosters will remain unpowered. Meteorologists currently predict favorable weather for the test with a 15% chance of lightning within 5 nautical miles of the area, which meets criteria required for the test, and will continue to monitor expected conditions.”

“NASA Television will provide live coverage with commentary of the demonstration beginning at 7:15 a.m. Sept. 21. Continuous live video of the Artemis I rocket and spacecraft at Launch Pad 39B remains available on the Kennedy Newsroom YouTube Channel.”


UPDATE from Sept. 12th, 2022 — “NASA Adjusts Dates for Artemis I Cryogenic Demonstration Test and Launch; Progress at Pad Continues”

At 6:41 pm EDT/4:11 am IST — “NASA has adjusted the targeted dates for a cryogenic demonstration test and to the next launch opportunities for Artemis I, the first integrated flight test of the Space Launch System rocket and Orion spacecraft beyond the Moon. The agency will conduct the demonstration test no earlier than Wednesday, Sept. 21, and has updated its request for a launch opportunity Sept. 27, with a potential backup opportunity of Oct. 2 under review.”

“The updated dates represent careful consideration of multiple logistical topics, including the additional value of having more time to prepare for the cryogenic demonstration test, and subsequently more time to prepare for the launch. The dates also allow managers to ensure teams have enough rest and to replenish supplies of cryogenic propellants.”

“NASA and SpaceX also continue to target no earlier than 12:45 p.m. EDT Monday, Oct. 3, for the launch of the agency’s Crew-5 mission to the International Space Station. Teams are working the upcoming commercial crew launch in parallel to the Artemis I planning and both launch schedules will continue to be assessed over the coming weeks. NASA and SpaceX will review the Artemis I and Crew-5 prelaunch processing milestones to understand any potential impacts. The agency’s Crew-4 return will continue to be planned following a short handover on the space station with Crew-5.”

“Over the weekend, Artemis I teams completed repair work to the area of a hydrogen leak, reconnecting the ground- and rocket-side plates on the quick disconnect for the liquid hydrogen fuel feed line where two seals were replaced last week. This week, teams will conduct tests at ambient conditions to ensure there is a tight bond between the two plates before testing again during the cryogenic tanking demonstration, and begin preparations for the test. During the demonstration, launch controllers will load supercold liquid oxygen and liquid hydrogen into the core stage and interim cryogenic propulsion stage of the SLS rocket. The demonstration will allow teams to confirm the hydrogen leak has been repaired, evaluate updated propellant loading procedures designed to reduce thermal and pressure-related stress on the system, conduct a kick-start bleed test, and evaluate pre-pressurization procedures.”

“NASA is continuing to respect the Eastern Range’s process for review of the agency’s request for an extension of the current testing requirement for the flight termination system and is providing additional information and data as needed. In parallel, the agency is continuing preparations for the cryogenic demonstration test and potential launch opportunities, should the request be approved.”

Specific times for the potential launch opportunities are as follows:

  • Sept 27: 70-minute launch window opens at 11:37 am EDT; landing on Nov. 5
  • Under review – Oct. 2: 109-minute launch window opens at 2:52 pm; landing on Nov. 11

UPDATE from Sept. 9th, 2022 — “Teams Replace Seals on Artemis I Moon Rocket, Prepare for Tanking Test”

At 5:10 pm EDT/2:40 am IST — “After disconnecting the ground and rocket-side plates on the interface, called a quick disconnect, for the liquid hydrogen fuel feed line, teams have replaced the seals on the Space Launch System rocket’s core stage associated with the liquid hydrogen leak detected during the Artemis I launch attempt Sept. 3.”

“Both the 8-inch line used to fill and drain liquid hydrogen from the core stage and the 4-inch bleed line used to redirect some of the propellant during tanking operations were removed and replaced this week.”

“Coming up, technicians will reconnect the umbilical plates and perform inspections over the weekend before preparing for a tanking demonstration as soon as Saturday, Sept. 17. This demonstration will allow engineers to check the new seals under cryogenic, or supercold, conditions as expected on launch day and before proceeding to the next launch attempt.”

“During the operation, teams will practice loading liquid hydrogen and liquid oxygen in the rocket’s core stage and interim cryogenic propulsion stage and getting to a stable replenish state for both propellants. Teams will confirm the leak has been repaired and also perform the kick-start bleed test and a pre-pressurization test, which will validate the ground and flight hardware and software systems can perform the necessary functions required to thermally condition the engines for flight. Following the test, teams will evaluate the data along with plans for the next launch opportunity.”


UPDATE from Sept. 8th, 2022 — “Repair Work Underway, Preparations Continue for Next Launch Opportunity”

At 7:00 pm EDT/4:30 am IST — “Engineers are making progress in repairing the area where a liquid hydrogen leak was detected during the Artemis I launch attempt on Sept. 3, and NASA is preserving options for the next launch opportunity as early as Friday, Sept. 23.”

“Technicians constructed a tent-like enclosure around the work area to protect the hardware and teams from weather and other environmental conditions at Launch Pad 39B. They have disconnected the ground- and rocket-side plates on the interface, called a quick disconnect, for the liquid hydrogen fuel feed line, performed initial inspections, and began replacing two seals – one surrounding the 8-inch line used to fill and drain liquid hydrogen from the core stage, and another surrounding the 4-inch bleed line used to redirect some of the propellant during tanking operations. The SLS rocket and Orion spacecraft are in good condition while remaining at the launch pad.”

“Once the work is complete, engineers will reconnect the plates and perform initial tests to evaluate the new seals. Teams will check the new seals under cryogenic, or supercold, conditions no earlier than Sept. 17 in which the rocket’s core stage and interim cryogenic propulsion stage will be loaded with liquid oxygen and liquid hydrogen to validate the repair under the conditions it would experience on launch day. Engineers are in the process of developing a full plan for the checkouts.”

“NASA has submitted a request to the Eastern Range for an extension of the current testing requirement for the flight termination system. NASA is respecting the range’s processes for review of the request, and the agency continues to provide detailed information to support a range decisions.”

“In the meantime, NASA is instructing the Artemis team to move forward with all preparations required for testing, followed by launch, including preparations to ensure adequate supplies of propellants and gases used in tanking operations, as well as flight operations planning for the mission.”

NASA has requested the following launch opportunities:

  • Sept 23: Two-hour launch window opens at 6:47 am EDT/4:17 pm IST; landing on Oct. 18
  • Sept. 27: 70-minute launch window opens at 11:37 am EDT/9:07 pm IST; landing on Nov. 5

“NASA’s teams internally are preparing to support additional dates in the event flexibility is required. The agency will evaluate and adjust launch opportunities and alternate dates based on progress at the pad and to align with other planned activities, including DART’s planned impact with an asteroid, the west coast launch of a government payload, and the launch of Crew-5 to the International Space Station.”


UPDATES from Sept. 8th, 2022

At 6:35 pm EDT/4:05 am IST — NASA preparing for the Artemis I SLS moon rocket launch today at 11 am EDT (15:00 UTC)/8:30 pm IST. We’ll be adding rocket launch updates to this post as soon as we get them from NASA’s Twitter handler.


Updates from Sept. 6, 2022

At 6:31 pm EDT/4:01 am IST — “After standing down on the Artemis I launch attempt Saturday, Sept. 3 due to a hydrogen leak, teams have decided to replace the seal on an interface, called the quick disconnect, between the liquid hydrogen fuel feed line on the mobile launcher and the Space Launch System (SLS) rocket while at the launch pad.”

“Performing the work at the pad requires technicians to set up an enclosure around the work area to protect the hardware from the weather and other environmental conditions, but enables engineers to test the repair under cryogenic, or supercold, conditions. Performing the work at the pad also allows teams to gather as much data as possible to understand the cause of the issue. Teams may return the rocket to the Vehicle Assembly Building (VAB) to perform additional work that does not require use of the cryogenic facilities available only at the pad.”

“To meet the current requirement by the Eastern Range for the certification on the flight termination system, NASA would need to roll the rocket and spacecraft back to the VAB before the next launch attempt to reset the system’s batteries.”

“Additionally, teams will also check plate coverings on other umbilical interfaces to ensure there are no leaks present at those locations. With seven main umbilical lines, each line may have multiple connection points.”


Coverage from Sept. 3rd, 2022

At 7:24 am EDT/4:54 pm IST — “Engineers detected a liquid hydrogen leak in a quick disconnect cavity and have stopped flowing the propellant to the core stage while they troubleshoot. Launch controllers are attempting to warm up the quick disconnect to attempt to reseat it to get a tight seal. Liquid oxygen flow is continuing.”

At 8:09 am EDT/5:39 pm IST — “Launch controllers have resumed flow of liquid hydrogen to the core stage after warming up a quick disconnect in the engine section where a hydrogen leak was detected in the cavity between the ground and flight side plates of the quick disconnect. Teams warmed up the quick disconnect to attempt to reseat it and set a proper seal.”

At 8:53 am EDT/6:23 pm IST — “As engineers increased the pressure on the flow of liquid hydrogen into the core stage, a leak reoccurred. Engineers will attempt to reseat the seal in the quick disconnect cavity where the leak has been detected. This time they will stop flowing liquid hydrogen to the tank, close the valve used to fill and drain it, then increase pressure on a ground transfer line using helium to to try to reseal it.”

At 9:23 am EDT/6:53 pm IST — “Launch controllers have started flowing liquid hydrogen to the core stage again after troubleshooting the reoccurrence of a leak. This time engineers attempted to reseat the seal in a quick disconnect cavity where the leak occurred by applying pressure to it with helium.”

At 9:36 am EDT/7:06 pm IST — “A liquid hydrogen leak has reoccurred again in a cavity between the ground and flight side plates of a quick disconnect in the engine section. Teams are discussing additional troubleshooting efforts.”

At 10:12 am EDT/7:42 pm IST — “Engineers are continuing troubleshooting efforts to address a liquid hydrogen leak in a cavity in the quick disconnect where the flight side and ground side plates join. They once again will attempt to warm up the quick disconnect to try to reset the seal.”

“The liquid oxygen tank of the core stage is full and is being replenished as some of the super cooled propellant boils off.”

At 10:18 am EDT/7:48 pm IST — “After warming up the area of the liquid hydrogen leak, engineers are once again flowing liquid hydrogen to the core stage.”

At 10:28 am EDT/7:58 pm IST — “After the third troubleshooting attempt, the liquid hydrogen leak has occurred again. Teams are discussing next steps.”

BIG UPDATE at 11:22 am EDT/8:52 IST — The launch has been postponed again at approx. 11:17 a.m. EDT/8:74 pm IST due to a leak supply side of the 8-inch quick disconnect while attempting to transfer fuel to the rocket.

“Teams encountered a liquid hydrogen leak while loading the propellant into the core stage of the Space Launch System rocket. Multiple troubleshooting efforts to address the area of the leak by reseating a seal in the quick disconnect where liquid hydrogen is fed into the rocket did not fix the issue. Engineers are continuing to gather additional data.”

“After standing down on today’s Artemis I launch attempt when engineers could not overcome a hydrogen leak in a quick disconnect, an interface between the liquid hydrogen fuel feed line and the Space Launch System (SLS) rocket, mission managers met and decided they will forego additional launch attempts in early September.”

“Over the next several days, teams will establish access to the area of the leak at Launch Pad 39B, and in parallel conduct a schedule assessment to provide additional data that will inform a decision on whether to perform work to replace a seal either at the pad, where it can be tested under cryogenic conditions, or inside the Vehicle Assembly Building.”

“To meet the requirement by the Eastern Range for the certification on the flight termination system, currently set at 25 days, NASA will need to roll the rocket and spacecraft back to the VAB before the next launch attempt to reset the system’s batteries. The flight termination system is required on all rockets to protect public safety.”

“During today’s launch attempt, engineers saw a leak in a cavity between the ground side and rocket side plates surrounding an 8-inch line used to fill and drain liquid hydrogen from the SLS rocket. Three attempts at reseating the seal were unsuccessful. While in an early phase of hydrogen loading operations called chilldown, when launch controllers cool down the lines and propulsion system prior to flowing super cold liquid hydrogen into the rocket’s tank at minus 423 degrees F, an inadvertent command was sent that temporarily raised the pressure in the system. While the rocket remained safe and it is too early to tell whether the bump in pressurization contributed to the cause of the leaky seal, engineers are examining the issue.”

“Because of the complex orbital mechanics involved in launching to the Moon, NASA would have had to launch Artemis I by Tuesday, Sept. 6 as part of the current launch period. View a list of launch windows here.”

See the latest tweets from NASA:


UPDATE from Sept. 2nd, 2022

Following the Artemis I pre-launch briefing, meteorologists with the U.S. Space Force Space Launch Delta 45 predict a 60% chance of favorable weather conditions at the beginning of the two-hour launch window that opens at 2:17 p.m. EDT Sept 3, increasing to an 80% chance of favorable weather conditions toward the later part of the window. The primary weather concern for the two-hour launch window remains scattered rain showers. The weather guidelines for NASA’s Artemis I flight test identify conditions to launch the agency’s Space Launch System (SLS) and Orion spacecraft.

“Teams will continue working their way through the countdown conducting planned health checks on SLS and Orion systems. The mission management team will meet early in the morning, Saturday, Sept. 3 and give the final determination for a “go” or “no-go” decision to begin tanking operations.”

“The uncrewed flight test will test SLS and Orion as an integrated system, demonstrating the performance of the rocket and testing the spacecraft’s capabilities as it journeys about 40,000 miles beyond the Moon over the course of about six weeks.”

“The first in an increasingly complex series of missions, Artemis I will pave the way for long-term lunar exploration, providing the foundation for extending human presence to the Moon and beyond.”


UPDATE from Sept. 1st, 2022

The Artemis I mission management team met this afternoon to review the status of the operations and have given a “go” for a Sept. 3 launch attempt of the Space Launch System rocket and Orion spacecraft. Since the previous launch attempt on Monday, Aug. 29, teams have updated procedures, practiced operations and refined timelines.

“Over the last day, teams worked to fix a leak on the tail service mast umbilical by replacing a flex-hose and a loose pressure sensor line, as the likely the source of the leak. Teams also retorqued, or tightened, the bolts surrounding that enclosure to ensure a tight seal when introducing the super-cooled propellants through those lines. While there was no leak detected at ambient temperatures, teams will continue to monitor during tanking operations.”

“Teams will adjust the procedures to chill down the engines, also called the kick start bleed test, about 30 to 45 minutes earlier in the countdown during the liquid hydrogen fast fill phase for the core stage. This will to allow for additional time to cool the engines to appropriate temperatures for launch.”

A new tweet from NASA on Sept. 1st, 2022 at 3:45 am IST.


UPDATE from Aug. 31st, 2022, at 5:00 pm IST

NASA moves the next Artemis I rocket launch attempt to September 3rd, 2022.

Mission managers met Tuesday to discuss data and develop a forward plan to address issues that arose during an Aug. 29 launch attempt for the flight test. During that launch attempt, teams were not able to chill down the four RS-25 engines to approximately minus 420 degrees F, with engine 3 showing higher temperatures than the other engines. Teams also saw a hydrogen leak on a component of the tail service mast umbilical quick disconnect, called the purge can, and managed the leak by manually adjusting propellant flow rates.

“In the coming days, teams will modify and practice propellant loading procedures to follow a procedure similar to what was successfully performed during the Green Run at NASA’s Stennis Space Center in Mississippi. The updated procedures would perform the chilldown test of the engines, also called the kick start bleed test, about 30 to 45 minutes earlier in the countdown during the liquid hydrogen fast fill liquid phase for the core stage.”

“Teams also are configuring platforms at Launch Pad 39B to enable engineers access to the purge can on the tail service mast umbilical. Once access is established, technicians will perform assessments and torque connection points where necessary.”

Meteorologists with the U.S. Space Force Space Launch Delta 45 predict a 60% chance of favorable weather conditions for an Artemis I launch attempt during a two-hour window that opens at 2:17 p.m. EDT Saturday, Sept. 3. While rain showers are expected in the area, they are predicted to be sporadic during the launch window.

“Today, engineers are implementing plans approved at yesterday’s mission management team meeting to address issues that arose during a launch attempt Aug. 29. The mission management team will reconvene Thursday, Sept. 1 to review data and overall readiness — NASA subsequently will hold a status update at 6 p.m. EDT.”

The countdown for launch is scheduled to resume Saturday at 4:37 a.m., at the L-9 hour, 40 minutes are planned to hold in the countdown where managers receive a weather briefing and conduct a poll on whether to proceed with propellant loading operations. Launch controllers do not need to begin the initial 46-hour, 10-minute countdown again because many of the configurations needed for launch are already in place.

Read NASA’s tweet.


UPDATE from Sept. 29th, 2022

NASA had to postpone its preparations due to an engine bleed issue, which caused the agency to postpone the launch of its massive next-generation Space Launch System (SLS) rocket. Read NASA’s tweet.

At around 8:34 am ET/6:04 pm IST, the launch director called off the Artemis I launch attempt. The NASA Artemis mission, which seeks to return people to the Moon by 2025, includes SLS as a crucial element. The massive rocket will transport the Orion crew capsule, which is expected to launch in 2024 and carry its first humans.

“Launch controllers were continuing to evaluate why a bleed test to get the RS-25 engines on the bottom of the core stage to the proper temperature range for liftoff was not successful and ran out of time in the two-hour launch window,” the agency said in a blog post.

At around 8:33 am ET/6:03 pm IST, the SLS was scheduled to launch, but NASA decided it would not be able to do so. The third engine’s failure to achieve the required temperature range for a launch was determined by NASA experts. According to the agency, the rocket is still in “stable, safe condition.”

The next attempt is planned for Friday, September 2nd, at 12:48 PM ET/10:18 pm IST. If the launch is successful, Orion will land in the ocean on October 11 after a 39-day journey. A third launch window will open on Monday, September 5th, if it doesn’t launch by that time.