Artemis I launch updates: Saturday launch scrubbed after reoccurring liquid hydrogen leak
It comes after the launch was scrubbed Monday due to an engine problem.
NASA kicked off Monday its plan to send an unmanned space capsule into the moon’s orbit, marking the initial launch in an ambitious plan to establish a long term presence on the moon for scientific discovery and economic development.
The space capsule, called Artemis I, will travel for roughly 40 days -- reaching as close as 60 miles from the moon, and then 40,000 miles above the moon when orbiting over its dark side -- before landing in the Pacific Ocean off the coast of San Diego.
After the launch was scrubbed, the next attempt will occur Sept. 3.
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Artemis still on track to launch Saturday
NASA officials announced Friday that Artemis I is still on track to launch Saturday afternoon between 2:17 p.m. ET and 4:17 p.m. ET.
Jeremy Parsons, deputy manager of exploration ground systems at the Kennedy Space Center, said pre-launch tests and checks are "proceeding right on schedule."
Melody Lovin, launch weather officer at the U.S. Space Force, said the weather forecast is currently a 60% go overall and 80% toward the end of the two-hour window, If the launch needs to be delayed until Monday, the forecast is a 70% go.
"I do not expect weather to be a showstopper by any means for either launch window," she said.
Artemis launch attempt still a-go for Saturday
The Artemis I launch attempt is still planned for Saturday from 2:17-4:17 p.m. ET, NASA officials said during a press conference Thursday.
"We're comfortable with our risk posture," Artemis mission manager Mike Serafin said. "That said, there's no guarantee that we're going to get off on Saturday, but we're going to try."
If not Saturday, the next launch attempt would be Monday from 5:12 p.m.-6:42 p.m. ET, officials said. Tuesday could also be an option, after which the next earliest launch attempt would be Sept. 19, Serafin said.
Sunday is no longer a backup option because the spacecraft would fly into an eclipse scenario, which would not allow it to get the power it needs from the sun.
If the launch is Saturday, the mission will be 37 days long, with the splashdown on Oct. 11, Serafin said.
-ABC News' Gio Benitez and Meredith Deliso
Artemis not launching Friday due to weather, NASA says
NASA officials said the Artemis I new launch date that was initially scheduled for Friday had to be moved due to bad weather.
The weather is 60% no go for Friday but looks to be more favorable Saturday.
"Looking forward to Saturday, weather would be a little bit different than what we experienced yesterday," Mark Berger, launch weather officer with the U.S. Space Force's 45th Weather Squadron, said during a media briefing Tuesday. "We will have a fairly strong onshore flow, and so that does favor showers and possibly a few thunderstorms moving in from the coast during the morning and early afternoon hours."
He added, "I'm optimistic that we'll have at least some clear air to work with during the afternoon to count on Saturday."
The window for launch on Saturday kicks off at 2:17 p.m. ET and ends at 4:17 p.m. ET. If need be, the launch can be pushed back to Monday.
If the launch does not occur by Monday, Artemis I will have to roll back to the Vehicle Assembly Building and won’t be able to launch until later in September.
This is because the flight termination batteries, which allow Artemis to be blown up if it veers off course, run low after 25 days.
-ABC News' Gio Benitez and Gina Sunseri
Problem with Artemis engine may have actually been faulty sensor: Officials
The issue with an engine on Artemis I that led to the launch on Monday being scrubbed may not have been an engine issue at all.
NASA officials said Monday that engine three did not chill down to a temperature of 500 degrees Rankine, or 40 degrees Fahrenheit, which is needed for ignition, compared to the other three engines.
However, John Honeycutt, manager of the Space Launch System Program from Marshall Space Flight Center, said the problem may have actually come from a faulty sensor, rather than the engine not cooling down enough.
"I think we've got enough data to put the story together but we've still got to go put the pieces together," Honeycutt said Tuesday.
'We don't launch until it's right,' says NASA administrator
NASA Administrator Bill Nelson defended the scrubbing of the Artemis I launch, saying the launch shouldn't take place until the team is sure it's ready.
"We don't launch until it's right," he said during an interview on NASA TV Monday morning.
"There are certain guidelines. And I think it's just illustrative that this is a very complicated machine, a very complicated system, and all those things have to work, and you don't want to light the candle until it's ready to go."
Nelson said the engineers will continue to "stress" and "test" the rocket to make sure it's ready by the next attempt, which is Sept. 2.
Earlier in the day, Nelson had welcomed several Biden administration officials, including Vice President Kamala Harris and second gentleman Doug Emhoff, to the Kennedy Space Center ahead of the launch.
He said the vice president has been briefed and the White House will continue to receive regular updates.