Artemis II sequence of events

Artemis II sequence of events

EXPECTED

Preparations

  • Expected.

Less than two months before launch (dd-mm-yyyy)

Less than two days before opening launch window (hh:mm)

Advice: All times in CET (00:00).

Opening launch window: CET Countdown to opening launch window:

  • 48:00 Launch Teams (LT, LCT) arrive at their stations at Launch Control Center (LCC, KSC, FL).
  • 45:00 Start countdown to opening launch window.
  • Etc.

Less than an hour before launch (T-minus in mm:ss)

Countdown T-minus

  • 20:00 Launch Management Team (LMT): Decision: Go for terminal count.
  • 10:00 Ground Launch Sequencer (GLS) initiates terminal count (T-10M). GLS does the countdown.
  • 06:00 Ground Launch Sequencer (GLS) gives a Go for Core Stage tank Pressurisation (brings tanks to flight levels).
  • 06:00 Orion ascent pyros are armed (T-6M).
  • 06:00 Orion set to internal power (T-6M)
  • 05:57 Core stage LH2 terminate replenish (T-5M57S).
  • 05:00 GLS gives a Go for Flight Termination System (FTS) to Arm (align the firing chain for a destruction of the vehicle in flight when needed).
  • Etc.

1. Launch

Kennedy Space Center, Florida, USA

  • Flight Day 0
  • Event: Launch
  • Date: 01-01-2024
  • Launch time: xxday 00-00-2024 at hh:mm:ss CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Distance to Moon: 238,855 miles

2. Low Earth Orbit

European Service Module deploys solar arrays

  • Flight Day 0
  • Event: Low Earth Orbit
  • Date: 01-01-2024
  • Time: CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

3. Perigee Raise Maneuvre

Interim Cryogenic Propulsion propels Orion to a higher orbit

  • Flight Day 0
  • Event: Perigee Raise Maneuvre
  • Date: 01-01-2024
  • Time: CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

4. Apogee Raise Burn

Second burn to high Earth orbit for 42-hour system checkout

  • Flight Day 0
  • Event: Apogee Raise Burn
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

5. Separation

Interim Cryogenic Propulsion System separates from Orion

  • Flight Day 0
  • Event: Separation
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

6. Translunar injection

Orion’s European Service Module main engine fires to propel the spacecraft to the Moon

  • Flight Day 0
  • Event: Translunar injection
  • Date: 00-00-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:01:30 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

7. Outbound coasting phase

Four-day trip to lunar orbit with European Service Module correcting the trajectory.

  • Flight Day x
  • Event: Outbound coasting phase
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles
  • Flight Day x
  • Event: Outbound coasting phase
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles
  • Flight Day x
  • Event: Outbound coasting phase
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles
  • Flight Day x
  • Event: Outbound coasting phase
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

8. Lunar flyby

7500 km from the Moon’s surface

  • Flight Day x
  • Event: Lunar flyby
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

9. Return to Earth

Four-day trip with Return Trajectory Corrections supplied by Orion’s European Service Module auxiliary engines

  • Flight Day x
  • Event: 
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles
  • Flight Day x
  • Event: 
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles
  • Flight Day x
  • Event: 
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles
  • Flight Day x
  • Event: 
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

10. Service Module separation

European Service Module and Crew Module Adaptor separate from Crew Module.

  • Flight Day x
  • Event: Service Module separation
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

11. Crew Module Reentry

European Service Module and Crew Module Adaptor burn up

  • Flight Day x
  • Event: Crew Module Reentry
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles

12. Splashdown

Pacific Ocean

  • Flight Day x
  • Event: Splashdown
  • Date: 01-01-2024
  • Time: 00:00 CET
  • Mission Elapsed Time: 00:00:00 (dd:hh:mm)
  • Velocity: 2,000 miles/hour
  • Distance from Earth: 20,000 miles
  • Distance to Moon: 200,000 miles
Artemis
Artemis
Artemis II trajectory basics
Artemis II trajectory basics

Footnote