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Artemis Stuff

#11
Yazata Offline
The Artemis I vehicle is fully assembled in the Vertical Assembly Building at Cape Canaveral. This particular SLS (the first one built) is slated to hurl an uncrewed Orion capsule around the Moon and back early next year. Then Artemis II will fly crew on the same path around the Moon. Then apparently Artemis III will go for a lunar landing, assuming that the Human Landing System is available by then. The SLS is so expensive that they will only be able to fly them at a cadence of about one a year. So Artemis I in 2022, Artemis II in 2023, and (ideally) Artemis III in 2024. (Everyone expects the human landing to slide.)


[Image: ywmpTeUe?format=jpg&name=small]
[Image: ywmpTeUe?format=jpg&name=small]

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#12
C C Offline
(Nov 11, 2021 08:46 PM)Yazata Wrote: [...] The SLS is so expensive that they will only be able to fly them at a cadence of about one a year. So Artemis I in 2022, Artemis II in 2023, and (ideally) Artemis III in 2024. (Everyone expects the human landing to slide.)

https://pbs.twimg.com/card_img/145881178...name=small

Yep, they moved the latter two up one year respectively. Bezos truly did do his part to assist any Beijing space-race, manned lunar goals.

https://www.techtimes.com/articles/26777...rliest.htm

excerpts: . . . NASA Administrator Bill Nelson has said that targeting 2024 to bring astronauts back to the moon is not really feasible.

The delays brought about by the ongoing COVID-19 pandemic as well as the lawsuit filed by Blue Origin against NASA have contributed to the change in the moon landing goal.

The Artemis program's first test flight, Artemis 1, is still scheduled to launch next February. However, the launch of the second test flight, Artemis 2, has been delayed from 2023 to 2024.

[...] NASA has decided to move the moon landing goal of the Artemis program from 2024 to 2025 at the earliest.
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#13
Yazata Offline
Here's an excellent Artemis infographic by Tony Bela

It shows the latest SuperHeavy booster configuration and the recently announced lengthened 'Depot' Starship variant that will remain in orbit as it receives fuel and oxidizer from the tanker variants. The HLS (and other deep space variants) will dock with it and get refueled in Earth orbit. An orbital gas station!


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#14
Yazata Offline
Artemis 1 is scheduled to launch on SLS's first flight for an uncrewed trip around the Moon on Monday August 29 at 5:33 AM PDT, 8:33 AM EDT, 12:33 UTC. It should be a sight to see, and I'm definitely getting up for that one.

SLS has a takeoff thrust of 39,440 Kn (kilonewtons), while Saturn V had 35,100 Kn, thus making SLS the most powerful rocket ever to achieve orbit (if it succeeds).

(But not the most powerful rocket ever to lift off from Earth. The Soviet N-1 Moon rocket had 45,400 Kn, but never succeeded in reaching orbit. They all blew up and the program was cancelled.)

... of course there's that Big Shiny Rocket coming (someday), that the FAA is currently slow-walking for a launch license, which should have 72,000 Kn.

But SLS will hold the record for a while... It still should be very cool to see a rocket that big take off.

https://nextspaceflight.com/launches/details/115

Here's a graphic that was shown at one of the Artemis press briefings, that shows the various parts of the Gateway lunar orbital space station and who is manufacturing what.

It looks like they will be leaning on Falcon Heavy to launch the various bits. The SpaceX "logistics module" is the previously announced Dragon XL supply capsule, which apparently will remain attached to Gateway for long periods and serve as another module, periodically swapped out for new ones arriving from Earth full of stuff. The smaller HTV-XG is another smaller supply capsule, to be designed and manufactured in Japan by JAXA.


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#15
Yazata Offline
Well Artemis 1 is still on track to launch two weeks from today, August 29. And NASA is talking about rolling it out to the pad tomorrow. There should be livestreams of the rollout in the usual places, starting with NASA Live.

https://twitter.com/NASAGroundSys/status...6550918145

NASA photos of the "Big Orange Rocket". (The orange color is spray foam insulation on the cryo tanks. The Space Shuttle main tank used the same insulation.)


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[Image: FaNENBHWIAE4GaD?format=jpg&name=900x900]




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[Image: FaNs7eYXgAAS4vt?format=jpg&name=900x900]

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#17
Yazata Offline
Artemis 1 is still on for tomorrow morning at 8:33 AM EDT, 5:33 AM PDT, 12:33 UTC

There will be many livestreams, the 'from the horse's mouth' one will be nasa's below. (The European Space Agency will have their own stream as well for you Euros.)

Keep in mind that this is a huge super-complex rocket, so there will be a significant risk that the countdown aborts tonight.

You will find real time updates on these twitter feeds

https://twitter.com/NASA

Exploration Ground System has the best status updates prior to launch

https://twitter.com/NASAGroundSys


https://www.youtube-nocookie.com/embed/CMLD0Lp0JBg

(nasa photo)


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[Image: FbQd7hNXwAIa_yZ?format=jpg&name=4096x4096]

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#18
Yazata Offline
Scrubbed for Monday, due to one of the engines failing to chill down to the correct cryogenic temperature. Also rain storm heading in. So they decided to call it.

The next opportunity will be Friday Sept 2
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#19
RainbowUnicorn Offline
thought i was in luck to see it launch, then the counter said going live in 4 days
so that's 2/9
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#20
Yazata Offline
As of now, the Artemis-1 SLS launch is still on for Saturday Sept 3 at 2:17 PM EDT, 18:17 UTC, 11:17 AM PDT

The biggest difficulty on Monday was engine #3 failing to chill down to engine ignition temperature. SLS uses liquid hydrogen as fuel and it's just a few degrees above absolute zero (so cold it has quantum effects). If fluid that cold flows into unprepared turbopumps, they are apt to break. So the turbomachinery has to be precooled down to cryo temperatures.

On Monday one of the temperature sensors indicated engine #3 wasn't cold enough. But upon review, other indicators suggested that the engine might have been colder than that one sensor indicated. So they have come around to the theory that the problem is a bad sensor. Unfortunately, replacing the sensor will require tearing into the bottom of the rocket and they don't want to roll it back to the VAB. So they are gonna wing it and simply start the engine chill process sooner to help ensure the engine gets colder.

https://www.nasa.gov/nasalive

Destination Moon!

(nasa photo)


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[Image: Fbsh25EXwAAcL_k?format=jpg&name=large]

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