Artemis II sequence of events

Artemis II

Artemis II sequence of events

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Artemis II: Calendar

  • All Times in CET.
  • Time format: DD-MM-YYYY HH:MM:SS CET
  • Time conversion: EST+ 6 = CET
  • Pre-Rollout conference: 16-01-2026 18:00:00 CET.
  • Rollout start: 17-01-2026 13:00:00 CET.
  • Crew interview: 17-01-2026 15:00 CET.
  • Crew (4): Commander: Reid Wiseman, Pilot: Victor Glover, Mission Specialists: Jeremy Hansen and Christina Koch
  • Launch pad: KSC Launch pad, LC-39B NASA Kennedy Space Center (KSC) Including weather at KSC).
  • Space Weather
  • Launch windows (2 hours):
      • Friday, 06-02-2026 03:41:00 – 05:41:00 (CET). First option.
      • Saturday, 07-02-2026 04:46:00 – 06:46:00 (CET)
      • Sunday, 08-02-20260 5:20:00 – 07:20:00 (CET)
      • Tuesday, 10-02-2026 06:06:00 – 08:06:00 (CET)
      • Wednesday, 11-02-2026 07:05:00 – 09:05:00 (CET)
      • Friday, 06-03-2026 02:29:00 – 04:29:00 (CET)
      • Saturday, 07-03-2026 02:57:00 – 04:57:00 (CET)
      • Sunday, 08-03-2026 04:56:00 – 06:56:00 (CET)
      • Monday, 09-03-2026 05:52:00 – 07:52:00 (CET)
      • Wednesday, 11-03-2026 06:48:00 – 08:43:00 (CET)
  • Launch Time: DD-MM-YYYY HH:MM:SS CET. Actual. Input for timers. Start Mission Time.
  • Duration: 10 days (expected).
  • Splashdown: 17-02-2026 UU-MM-SS CET. San Diego (expected)
  • Mission Duration: DD-UU-MM-SS

1. Rollout & Pad Operations (in DD-HH-MM-SS)

OK = Successfully completed

  • T-07-12-00-00 Rollout planning briefing OK
  • T-07-06-00-00 Mission rollout authority confirmed OK
  • T-07-00-00-00 Final rollout constraints review OK
  • T-06-18-00-00 Mobile Launcher transport configuration verified OK
  • T-06-15-00-00 Crawler-Transporter systems inspection OK
  • T-06-12-00-00 Vehicle Assembly Building high bay cleared OK
  • T-06-06-00-00 High bay environmental controls stabilized OK
  • T-06-01-00-00 VAB doors opened for Rollout OK
  • T-06-00-45-00 Crawler-Transporter positioned under Mobile Launcher OK
  • T-06-00-30-00 Crawler-Transporter positioning confirmed OK
  • T-06-00-25-00 Jacking and leveling system armed OK
  • T-06-00-20-00 Structural load sensors powered OK
  • T-06-00-15-00 Weather constraints verified OK
  • T-06-00-10-00 Lightning protection systems checked OK
  • T-06-00-07-00 Communications links verified OK
  • T-06-00-05-00 Rollout readiness poll conducted OK
  • T-06-00-02-00 Rollout authorization signed (15-01-2026) OK
  • T-06-00-00-00 Rollout begins from VAB (17-01-2026) OK
  • T-05-23-55-00 Initial crawler motion verified OK
  • T-05-23-50-00 Vehicle clears VAB threshold OK
  • T-05-23-45-00 VAB door closure initiated OK
  • T-05-23-40-00 Transport speed stabilized OK
  • T-05-23-35-00 Structural monitoring active OK
  • T-05-22-00-00 Crawler steering alignment check OK
  • T-05-20-00-00 Mid-rollout inspection completed OK
  • T-05-19-00-00 Thermal gradients reviewed OK
  • T-05-18-00-00 Guidance systems alignment checked OK
  • T-05-17-00-00 Crawler braking test OK
  • T-05-16-00-00 Pad arrival clearance issued OK
  • T-05-14-00-00 Approach corridor verified OK
  • T-05-12-00-00 Vehicle approaches Launch Pad LC-39B. NASA Kennedy Space Center (KSC) OK
  • T-05-11-00-00 Pad hazard area cleared OK
  • T-05-10-30-00 Final crawler positioning OK
  • T-05-10-00-00 Pad interface safety verification OK
  • T-05-09-45-00 Mobile Launcher lowering initiated OK
  • T-05-09-30-00 Mobile Launcher hard-down OK
  • T-05-09-15-00 Load transfer confirmed OK
  • T-05-09-00-00 Vehicle leveling confirmed OK
  • T-05-08-45-00 Pad structural lock pre-check OK
  • T-05-08-30-00 Pad structural locks engaged OK
  • T-05-08-15-00 Structural load re-balance OK
  • T-05-08-00-00 Ground power connected OK
  • T-05-07-45-00 Ground power quality verified OK
  • T-05-07-30-00 Data umbilicals connected OK
  • T-05-07-15-00 Data path validation OK
  • T-05-07-00-00 Environmental control lines attached OK
  • T-05-06-30-00 Environmental flow stabilized OK
  • T-05-06-00-00 Pad safety perimeter verified OK
  • T-05-06-00-00 Emergency Egress, crew access arm tested OK

2. Pad Activation, Tests & Reviews (in DD-HH-MM-SS)

  • T-05-00-00-00 Pad PIA / PIPA (Pad Interface and Performance Assessment (checks interfaces between SLS/Orion and the launch pad). OK
  • T-05-00-00-00 Booster servicing OK
  • T-05-00-00-00 Integrated vehicle power-up OK
  • T-04-21-00-00 Core Stage avionics pre-power checks OK
  • T-04-18-00-00 Core Stage avionics activated OK
  • T-04-15-00-00 Orion avionics pre-power checks OK
  • T-04-12-00-00 Orion avionics activated OK
  • T-04-09-00-00 Launch Abort System controller checks OK
  • T-04-06-00-00 Launch Abort System power check OK
  • T-04-03-00-00 Guidance system load verification OK
  • T-04-00-00-00 Guidance system initialized OK
  • T-03-21-00-00 Navigation sensor warm-up OK
  • T-03-18-00-00 Navigation sensors calibrated OK
  • T-03-15-00-00 Star tracker alignment test OK
  • T-03-12-00-00 Communications systems checked OK
  • T-03-09-00-00 Voice and telemetry loop tests OK
  • T-03-06-00-00 Flight termination system inspection OK
  • T-03-03-00-00 Range safety data verification OK
  • T-03-00-00-00 RS-25 engine controllers powered OK
  • T-02-21-00-00 ICPS avionics pre-checks OK
  • T-02-18-00-00 ICPS avionics activated OK
  • T-02-15-00-00 Propulsion data validation OK
  • T-02-12-00-00 Integrated systems health check OK
  • T-02-09-00-00 Redundancy failover test OK
  • T-02-06-00-00 Thermal conditioning systems active OK
  • T-02-03-00-00 Countdown clock verification OK
  • T-02-00-00-00 Countdown simulation initiated OK
  • T-01-21-00-00 Ground system redundancy verified OK
  • T-01-18-00-00 Emergency response readiness review OK
  • T-01-15-00-00 Weather rule compliance review OK
  • T-01-12-00-00 Range safety coordination reviewed OK
  • T-01-09-00-00 Launch control system validation OK
  • T-01-06-00-00 Countdown rehearsal completed OK
  • T-01-03-00-00 Open work closeout OK
  • T-01-03-00-00 Flight Readiness Review (FRR) (expected dd-mm-yyyy)
  • T-00-12-00-00 Start Wet Dress Rehearsal (WDR) (expected 02-02-2026) (No crew, hold at T-00-00-00-29)
  • OR
  • T-00-12-00-00 Launch preparations granted (expected dd-mm-yyyy)

3. Launch Day Countdown & Crew (in DD-HH-MM-SS)

  • T-00-12-00-00 Pad cryogenic systems chill
  • T-00-10-00-00 Cryogenic loading approved
  • T-00-09-30-00 Transfer line conditioning
  • T-00-09-00-00 LOX tank chill-down
  • T-00-08-30-00 LH2 tank chill-down
  • T-00-08-00-00 ICPS chill-down completed
  • T-00-08-00-00 LOX slow fill initiated
  • T-00-07-45-00 LOX level verification
  • T-00-07-30-00 LH2 slow fill initiated
  • T-00-07-15-00 LH2 temperature trending
  • T-00-07-00-00 ICPS propellant slow fill
  • T-00-06-00-00 Tank ullage monitoring
  • T-00-05-00-00 Slow fill completion confirmed
  • T-00-04-30-00 Fast fill prep briefing
  • T-00-04-00-00 Pad cleared for crew arrival
  • T-00-03-45-00 White Room configured
  • T-00-03-30-00 Crew suit-up initiated
  • T-00-03-15-00 Crew medical checks completed
  • T-00-03-00-00 Crew transport to launch complex
  • T-00-02-50-00 Crew convoy security confirmed
  • T-00-02-45-00 Crew arrival at pad
  • T-00-02-35-00 Crew safety briefing
  • T-00-02-30-00 Crew elevator ascent begins
  • T-00-02-20-00 Crew reaches White Room
  • T-00-02-15-00 Crew ingress into Orion
  • T-00-02-05-00 Seat ingress verification
  • T-00-02-00-00 Crew seated and secured
  • T-00-01-55-00 Restraint checks complete
  • T-00-01-50-00 Crew communications check
  • T-00-01-45-00 Cabin close-out inspection
  • T-00-01-40-00 Hatch closure initiated
  • T-00-01-37-00 Hatch seal verification
  • T-00-01-35-00 Cabin leak check
  • T-00-01-32-00 Cabin pressure stabilization
  • T-00-01-30-00 Orion internal power confirmed
  • T-00-01-15-00 Final tank topping
  • T-00-01-00-00 Launch Abort System armed
  • T-00-00-50-00 Guidance alignment update
  • T-00-00-45-00 Weather final briefing
  • T-00-00-40-00 Range final status
  • T-00-00-33-00 Autonomous countdown sequencer enabled
  • T-00-00-20-00 Ground systems launch config
  • T-00-00-15-00 Mission Management Team poll
  • T-00-00-10-00 Terminal countdown initiated
  • T-00-00-05-00 Engine controller final checks
  • T-00-00-00-29 Stop when Wet Dress Rehearsal (WDR) (02-02-2026 expected)
  • T-00-00-02-00 Launch Readiness Review (LRR)
  • T-00-00-02-00 Polling: Go / No-Go for Launch

4. Launch & Ascent (MET in DD-HH-MM-SS)

  • 00-00-00-00 Launch commit executed
  • 00-00-00-03 Vehicle internal power transition
  • 00-00-00-06 Hydrogen burn-off igniters activated
  • 00-00-00-07 RS-25 engine ignition sequence
  • 00-00-00-08 Engine health verification
  • 00-00-00-10 Liftoff (launch) (Step 1)
  • 00-00-00-15 Hold-down post release
  • 00-00-00-20 Vehicle clears launch tower
  • 00-00-00-25 Guidance closed-loop control
  • 00-00-00-30 Roll maneuver initiated
  • 00-00-00-40 Roll maneuver complete
  • 00-00-00-45 Pitch program initiated
  • 00-00-01-10 Throttle bucket entry
  • 00-00-01-20 Maximum dynamic pressure
  • 00-00-01-40 Throttle recovery
  • 00-00-02-00 Booster tailoff
  • 00-00-02-10 Solid Rocket Booster separation (Step 2)
  • 00-00-02-20 Booster clearance confirmed
  • 00-00-03-30 Core Stage guidance update
  • 00-00-06-00 Mixture ratio adjustment
  • 00-00-08-00 Core Stage propellant depletion prediction
  • 00-00-08-20 Core stage Main Engine Cutoff (MECO) (Step 3)
  • 00-00-08-25 Thrust termination confirmed
  • 00-00-08-30 Core Stage separation
  • 00-00-08-50 Separation dynamics damped
  • 00-00-09-00 ICPS ignition
  • 00-00-12-00 Parking orbit insertion burn complete
  • 00-00-18-00 Stable parking orbit achieved

5. Earth Orbit, TLI & Lunar Flyby (MET in DD-HH-MM-SS)

  • 00-00-30-00 Orbit phasing setup
  • 00-01-00-00 Systems stabilization in orbit
  • 00-01-30-00 Post-insertion systems checkout
  • 00-01-50-00 Trans Lunar Injection (TLI) readiness review
  • 00-00-00-00 Perigee raise maneuver (Step 4)
  • 00-00-00-00 Apogee raise burn to high Earth orbit (Step 5)
  • 00-02-30-00 Orion separation from ICPS followed by Proximity Operations Demonstration (plus manual handling qualities assessment for up to 2 hours, testing) (Step 6)
  • 00-00-00-00 Perigee raise burn
  • 00-00-00-00 Orion Upper Stage Separation (USS) separation (USS) burn (Step 7)
    00-00-00-00 Perigee raise burn (Step 8)
  • 00-02-00-00 Trans Lunar Injection (TLI) burn initiated
  • 00-02-10-00 Mid-burn guidance update
  • 00-02-20-00 Trans Lunar Injection (TLI) burn completed (Step 9)
  • 00-02-25-00 Trajectory verification
  • 00-00-00-00 Apogee raise burn to high Earth orbit (begin 23,5 hour checkout of spacecraft)
  • 00-02-30-00 ICPS shutdown
  • 00-00-00-00 Perigee raise burn
  • 00-02-45-00 Orion attitude acquisition
  • 00-03-00-00 Orion autonomous flight established
  • 00-00-00-00 Outbound transit to Moon. Outbound Trajectory Correction (OTC)  for Lunar free return trajectory. Travel time 4 days (Step 10)
  • 01-00-00-00 Translunar coast operations
  • 02-00-00-00 Mid-course correction executed
  • 03-00-00-00 Navigation solution update
  • 04-00-00-00 Lunar approach targeting
  • 04-01-00-00 Lunar far-side tracking
  • 04-02-00-00 Lunar Flyby. Closest approach to Moon (10.427 km) (Step 11)
  • 04-03-00-00 Free-return energy confirmation
  • 04-04-00-00 Lunar gravity assist complete
  • 04-06-00-00 Free-return trajectory confirmed
  • 00-00-00-00 Trans-Earth Return. Return Trajectory Correction (RTC) burns as necessary to aim to Earth’s atmosphere (Step 12)
Dashboard

6. Earth Return, Entry & Splashdown (MET in DD-HH-MM-SS)

  • 05-00-00-00 Earth return coast begins
  • 07-00-00-00 Entry targeting refinement
  • 08-00-00-00 Entry corridor verification
  • 09-12-00-00 Crew cabin configured for entry
  • 09-18-00-00 Service Module (SM) separation prep (Step 13)
  • 09-22-00-00 Service Module separation executed
  • 09-23-00-00 Attitude reorientation for entry
  • 10-00-00-00 Entry interface (Step 14)
  • 10-00-00-40 Plasma onset
  • 10-00-01-00 Communications blackout begins
  • 10-00-02-00 Peak deceleration
  • 10-00-03-00 Peak aerodynamic heating
  • 10-00-05-00 Lift modulation guidance
  • 10-00-06-00 Communications blackout ends
  • 10-00-07-30 Drogue deployment command
  • 10-00-08-00 Drogue parachutes deployed
  • 10-00-09-30 Vehicle stabilized
  • 10-00-10-00 Main parachute deployment
  • 10-00-11-00 Main parachutes inflated
  • 10-00-13-00 Descent rate stabilized
  • 10-00-15-00 Splashdown (San Diego) (Step 15)

Personnel

Artemis II Crew

  • Reid Wiseman – Commander (NASA) – born 1975.
  • Victor Glover – Pilot (NASA) – born 1976.
  • Christina Koch – Mission Specialist (NASA) – born 1979.
  • Jeremy Hansen – Mission Specialist (Canadian Space Agency) – born 1976.

Artemis II Ground Team

  • John Honeycutt – Artemis II mission management team chair
  • Charlie Blackwell-Thompson – Artemis launch director, Exploration Ground Systems
  • Jeff Radigan – Artemis II lead flight director, Flight Operations Directorate
  • Lili Villarreal – landing and recovery director, Exploration Ground Systems
  • Jacob Bleacher – chief exploration scientist, Exploration Systems Development Mission Directorate
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