Perseverance Launch & Cruise |
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Perseverance Launch & Cruise |
 Feb 15 2021, 08:51 PM
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#61
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 Senior Member  Group: Members Posts: 2083 Joined: 13-February 10 From: Ontario Member No.: 5221  |
I think it is just a generic point near the centre of the ellipse. The real landing will deviate somewhat in both entry point and trajectory through the atmosphere, as well as the direction onboard navigation takes it when firing the thrusters. Definitely smart enough not to land on a giant slope!
P.S. my own question for anyone in the know: any plans on MRO attempting imaging like MSL, or does the bent-pipe relay attitude preclude it this time around? I could really use a new avatar.... |
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Feb 15 2021, 09:21 PM
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#62
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Member Group: Members Posts: 122 Joined: 19-June 07 Member No.: 2455 |
QUOTE (Explorer1 @ Feb 15 2021, 01:51 PM)  I think it is just a generic point near the centre of the ellipse. The real landing will deviate somewhat in both entry point and trajectory through the atmosphere, as well as the direction onboard navigation takes it when firing the thrusters. Definitely smart enough not to land on a giant slope! P.S. my own question for anyone in the know: any plans on MRO attempting imaging like MSL, or does the bent-pipe relay attitude preclude it this time around? I could really use a new avatar.... PlanetFest 21 happened this weekend (run by the Planetary Society) and there was an amazing talk by Rob Manning of the details of the landing. The ellipse (which this time is really a circle) they could come down in is about the size of Manhattan but the expectations are that the lander would emerge in powered descent somewhere near the center of it which is somewhat near the delta but below it in the crater. The onboard navigation system is designed to locate the closest safe spot to where it figures out it is and aim for that. He said that they determined there were safe spots to be found at all parts of the ellipse within close proximity. Eventually that talk will be posted to the Planetary Society's Youtube page so watch for it. The engineering he described is amazing. He also said that MRO will be tasked with not only going after a shot of the lander on the parachute but also during the actual powered landing as well if they can get lucky. |
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Feb 15 2021, 11:46 PM
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#63
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
QUOTE (Explorer1 @ Feb 15 2021, 12:51 PM) any plans on MRO attempting imaging like MSL At the L-30 briefing they said yes - infact, they're going to try and do it a little later during EDL - so you'll have the powered descent vehicle flying below the parachute and backshell. Fingers crossed. |
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Feb 16 2021, 03:13 AM
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#64
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 Member Group: Members Posts: 219 Joined: 14-November 11 From: Washington, DC Member No.: 6237 |
QUOTE (Art Martin @ Feb 15 2021, 04:21 PM) ... about the size of Manhattan ... I was curious:
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Feb 17 2021, 12:41 AM
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#65
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Can someone give any more detailed insight on how exactly does the TRN work ? Are they aiming for a safe spot at the center of the landing ellipse, or any safe spot ?
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Feb 17 2021, 02:00 AM
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#66
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Senior Member Group: Members Posts: 2511 Joined: 13-September 05 Member No.: 497 |
QUOTE (MahFL @ Feb 16 2021, 04:41 PM) ...how exactly does the TRN work ? Are they aiming for a safe spot at the center of the landing ellipse, or any safe spot ? It has a catalog of multiple safe spots within the ellipse and guides toward the closest one based on imaging. See https://www.jpl.nasa.gov/news/a-neil-armstr...mars-2020-rover and https://trs.jpl.nasa.gov/handle/2014/46186 -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Feb 17 2021, 03:35 AM
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#67
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Thank you for the links, now I have a good understanding.
Less than 2M miles to go now.... |
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Feb 18 2021, 12:41 AM
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#68
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Less than 1M miles to go now.
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Feb 18 2021, 12:49 AM
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#69
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Member Group: Members Posts: 154 Joined: 8-June 04 Member No.: 80 |
I know MRO will be able to act as a relay for Perseverance during landing. Will Mars Odyssey or MAVEN be available as well?
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Feb 18 2021, 01:00 AM
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#70
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
QUOTE (pioneer @ Feb 18 2021, 01:49 AM) I know MRO will be able to act as a relay for Perseverance during landing. Will Mars Odyssey or MAVEN be available as well? I think TGO is recording during the landing, later other orbiters are making passes, there are 5 orbiters that can relay rover data. |
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Feb 18 2021, 02:50 AM
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#71
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
MRO will be doing bent-pipe realtime relay ( which is a new feature on MRO thanks to a software update )
MAVEN will be doing canister mode recording for later return to Earth. See pages 23 and 43 of the Landing Press Kit https://www.jpl.nasa.gov/news/press_kits/ma...g_press_kit.pdf |
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Feb 18 2021, 03:01 AM
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#72
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 Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
Does anyone know of a Jezero map using the same coordinates as this landing zone map that was presented today:
Knowing the origin of those coords we could probably translate into lat,long... |
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Feb 18 2021, 03:49 AM
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#73
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
That's not a map of the surface - that's a map of a plan through deep space. The spacecraft actively flies its way through entry to target the center of the ellipse. You can't translate that entry mapping image onto a surface map.
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Feb 18 2021, 04:34 AM
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#74
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Solar System Cartographer Group: Members Posts: 10154 Joined: 5-April 05 From: Canada Member No.: 227 |
Right - it's showing where the entry target point is on a plane perpendicular to the approach vector.
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 PD: 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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Feb 18 2021, 05:21 AM
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#75
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
I see; thanks.
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