NASA is targeting windows between March 6 and March 11, 2026 following Artemis II wet dress rehearsal challenges.
CAPE CANAVERAL, FL — NASA has officially moved the target launch for Artemis II, the first crewed mission of the Artemis program, to no earlier than March 2026. The decision follows the conclusion of the mission’s first Wet Dress Rehearsal (WDR), which successfully validated several systems but uncovered technical hurdles that require additional troubleshooting.
The Purpose of the Test
The Wet Dress Rehearsal is a “full-up” prelaunch simulation designed to stress-test the Space Launch System (SLS) rocket, the Orion spacecraft, and ground systems under flight-like conditions—without actually igniting the engines.
Key Technical Challenges Encountered
While teams successfully filled the massive tanks of both the SLS core stage and the Interim Cryogenic Propulsion Stage (ICPS) with over 700,000 gallons of propellant, the countdown was not without its complications:
- Hydrogen Leakage: Engineers spent hours managing a liquid hydrogen leak at a core stage interface. The leak required multiple pauses to warm hardware and allow seals to reseat.
- Automatic Halt: The ground launch sequencer automatically stopped the clock at T-5 minutes 15 seconds after detecting an increase in the hydrogen leak rate.
- Orion Valve Adjustments: Closeout operations for the Orion capsule took longer than anticipated, including a necessary “retorque” of a valve associated with the crew module hatch pressurization.
- Environmental & Comms Issues: Ground teams dealt with intermittent audio dropouts and the impacts of recent Florida cold weather on various cameras and ground equipment.
Despite the delays, the test successfully demonstrated updated Orion closeout purge procedures. Teams used breathing air instead of gaseous nitrogen in the “White Room,” a move designed to enhance safety for the ground crew and the four astronauts who will eventually board the capsule.
Looking Ahead: The Road to March
NASA Administrator Jared Isaacman confirmed that the agency will now pivot to a March launch window, forgoing the remaining opportunities in February to ensure all anomalies are resolved.
| Next Steps | Action Item |
| Data Review | Comprehensive analysis of all sensor data from the WDR. |
| Mitigation | Troubleshooting the hydrogen leak interface and communication dropouts. |
| Repairs | Completing hardware updates at Pad 39B. |
| Retesting | Conducting at least one additional Wet Dress Rehearsal. |
| Launch | Targeting windows between March 6 and March 11, 2026. |
The Artemis II crew—NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with CSA astronaut Jeremy Hansen—have been released from their pre-launch quarantine and will re-enter isolation approximately two weeks before the new March target date.
