
NASA / Ben Smegelsky
NASA Eyes Next Wet Dress Rehearsal for Artemis II (News Release)
NASA is targeting Thursday, February 19, as the tanking day for the second wet dress rehearsal ahead of the agency’s Artemis II test flight.
Over the weekend, teams replaced a filter in ground support equipment that was suspected of reducing the flow of liquid hydrogen during a February 12 partial fueling test. The test provided enough data to allow engineers to plan towards a second wet dress rehearsal this week. Engineers have reconnected the line with the new filter and are reestablishing proper environmental conditions.
The wet dress rehearsal will run the launch team as well as supporting teams through a full range of operations, including loading cryogenic liquid propellant into the SLS (Space Launch System) rocket’s tanks, conducting a launch countdown, demonstrating the ability to recycle the countdown clock, and draining the tanks to practice scrub procedures.
Launch controllers will arrive to their consoles in the Launch Control Center at NASA’s Kennedy Space Center in Florida at 6:40 p.m. EST on February 17 to begin the nearly 50-hour countdown. The simulated launch time is 8:30 p.m. on February 19, with a four-hour window for the test. While the Artemis II crew is not participating in the test, a team of personnel will go to the launch pad to practice Orion closeout operations, including closing the spacecraft’s hatches.
During the rehearsal, the team will execute a detailed countdown sequence. Operators will conduct two runs of the last ten minutes of the countdown, known as terminal count. They will pause at T-1 minute and 30 seconds for up to three minutes, then resume until T-33 seconds before launch and pause again.
After the pause, the team will recycle the clock back to T-10 minutes and conduct a second terminal countdown to just inside of T-30 seconds before ending the sequence. This process simulates real-world conditions, including scenarios where a launch might be scrubbed due to technical or weather issues.
While NASA will not set a formal launch date until after a successful rehearsal and data reviews, the agency has been evaluating in recent weeks if there are additional days that would be suitable for launch and found an extra opportunity during the first week of March. However, managers have determined that March 6 is the earliest opportunity for launch that allows for a second wet dress rehearsal, sufficient time for data review, and time to transition the launch pad, rocket and spacecraft to launch operations.
A 24/7 live stream of the rocket at the pad remains online. During the upcoming wet dress rehearsal, NASA will provide a separate feed with additional camera views on the day of fueling and share updates via the agency’s Artemis blog.
Source: NASA.Gov
















