Astrobotic PM-1 mission, CLPS mission with NASA and commercial payloads |
Astrobotic PM-1 mission, CLPS mission with NASA and commercial payloads |
Feb 4 2022, 03:12 AM
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#1
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
I am starting a new thread for this mission which should fly this year.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 9 2024, 08:05 AM
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#2
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
Update #6:
"An ongoing propellant leak [...]" "[...] in a stable sun pointing state for approximately 40 more hours, [...]" https://twitter.com/astrobotic/status/1744543629392134194 Anything known about what caused this propellant leak? Thorsten |
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Jan 9 2024, 04:41 PM
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#3
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Anything known about what caused this propellant leak? I haven't heard anything, and there is not much public detail about Peregrine's propulsion system. But it started right after the system was pressurized and was large enough to disturb blankets. I can think of three root causes: 1) damage during launch vibration (hopefully unlikely since the spacecraft was vibe-tested); 2) propellant migration causing a small explosion that blew a hole in the plumbing; 3) pressure regulator failure leading to overpressurization. Assuming https://www.nasa.gov/stmd-game-changing-dev...in-space-talos/ describes what they ended up flying, the main engines were MON-25/MMH biprops but how the attitude-control thrusters (presumably monoprops) were tied in, I have not seen. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Jan 9 2024, 06:55 PM
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#4
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Member Group: Members Posts: 684 Joined: 24-July 15 Member No.: 7619 |
snip 1) damage during launch vibration (hopefully unlikely since the spacecraft was vibe-tested) snip I wonder if there might be an unexpected resonance- e.g. when the SpaceX Falcon Heavy launches from Kennedy Space Center, the Vehicle Assembly Building 'squeals' because it randomly has a resonant frequency with the Merlin engine exhaust. Sorta makes sense that the first actual lift off a brand-new rocket is when you actually find out about the sounds and launchpad acoustics. |
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Jan 9 2024, 07:27 PM
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#5
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Sorta makes sense that the first actual lift off a brand-new rocket is when you actually find out about the sounds and launchpad acoustics. Normally all of that is determined by analysis and then the testing is done with a lot of extra margin to cover all uncertainties. https://blogs.sw.siemens.com/simcenter/spac...oustic-testing/ And it's not like Vulcan is that different than Atlas in that regard. What is a little odd is that Peregrine was supposed to be launched with two prototype Kuiper satellites, but after all of the delays, those were launched separately. There didn't seem to be any place to put them on the Centaur, but it seems implausible that they changed the configuration enough to impact Peregrine unfavorably. If Astrobotic decides this was a vibe-induced failure, I'm sure there will be some finger-pointing. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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