Moon, at 20.17 the launch of Artemis 1 DIRECT – Space & Astronomy was retried

At the Kennedy Space Center in Florida, operations have resumed in light of the launch of the Artemis 1 mission, the first unmanned test flight that paves the way for the return of man with the first woman to the moon. After days of frantic work in which technicians stopped analyzing launch data last Monday, the expected “launch” from NASA came to the new attempt scheduled for Saturday, September 3, within a two-hour launch window that will open at 20:17 – Italian time. The latest weather report predicts favorable conditions at 60%, but there are many unknowns.

The countdown has resumed, but the hydrogen loading has stopped
The countdown resumed as planned and in the meantime the loading of liquid oxygen also resumed, after a short interruption, possibly due to the high level in the launcher tank 39B. However, in the meantime, the loading of liquid hydrogen in the central stage of the SLS rocket stopped due to a leak. This was announced by NASA, according to which the problem was found in a different part from the part that forced on August 29 to postpone the launch.

“Go” when loading fuel
Meanwhile, launch director Charlie Blackwell Thompson gave the final green light to load propellant for the Space Launch System (SLS) rocket for the unmanned Artemis 1 mission to the moon.

Unknown
“There is no guarantee that we will take off on Saturday, but we will be there and we will try,” Mike Sarafin, director of the mission, told a news conference. In fact, this weekend’s retry launch includes a “marginal increase in risk,” which NASA administrators deemed acceptable: Data analysis in recent days indicates that the anomalous temperature of one of the rocket engines found on Monday was not due to A real engine problem but due to a sensor malfunction which will be ignored on Saturday. To avoid new unexpected events, engine cooling procedures will be started 30-45 minutes earlier than expected, in order to have more time to reach temperature. Meanwhile, the loss of hydrogen detected during missile loading is still being monitored: for now it has been fixed and does not appear to cause room temperature problems, but the teams will continue to monitor the situation on Saturday during propellant loadings. So the procedures have been updated in the last few hours and the launch timing has been improved. Once Orion is turned on, the countdown is also restarted.

The latest weather forecast for Saturday projects favorable conditions at 60%, with a gradual improvement of up to 80% by the end of the launch window. However, it is estimated that in a couple of hours there will be 46 moments in which it is possible to pause for a few seconds for launch due to the presence of space debris or satellites of the Starlink constellation along the trajectory of the SLS rocket.

Hopefully, Artemis will have about 38-39 days to test the technologies needed to fly around the Moon and return safely to Earth. It is scheduled to return on October 11 with a layover off the California coast. On the other hand, if the launch goes down again, due to weather or some unforeseen technical factor, there may be new launch chances on Monday 5th September (with 70% favorable weather) and again on Tuesday 6th September. If the Artemis 1 launch fails by Tuesday, the SLS will likely have to leave the launch pad and return to the Integration Building (Vab) to replace the batteries for the safety system that interrupts the flight in the event of an emergency. termination system).