MAVEN Orbital Science, Post Siding Spring |
MAVEN Orbital Science, Post Siding Spring |
Mar 4 2017, 07:55 AM
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#16
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Member Group: Members Posts: 257 Joined: 28-October 12 Member No.: 6732 |
I must confess that this press release sounds a little bit hyped-up to me. Flybys at Phobos of Mars Express are known and science investigations are planned months in advance.
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Mar 4 2017, 08:42 AM
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#17
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Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Perhaps a bit. It certainly seems like it's getting a fair amount of attention from the world press. However, I can also see why they might want that, and it's an interesting story in its own right for people who do not ordinarily pay much attention to robotic spaceflight.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Mar 4 2017, 05:56 PM
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#18
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Senior Member Group: Members Posts: 1278 Joined: 25-November 04 Member No.: 114 |
Are any science observations being done by Maven?
The article doesn't state if it will? |
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Mar 4 2017, 06:45 PM
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#19
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Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
It was observed in ultraviolet in December 2015, 500 kilometres away: http://mars.nasa.gov/news/2016/maven-obser...far-ultraviolet
Not sure if they'll do any new measurements this time; how far will this flyby be in distance? |
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Mar 4 2017, 07:29 PM
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#20
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Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Not sure. Phobos' orbital velocity is a bit more than 2.1 km/sec, and the press release says that the avoidance maneuver allows MAVEN to miss the intersect point by 2.5 min so...minimum 315 km? That doesn't account for MAVEN's own velocity at this point in its elliptical orbit, though.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Sep 21 2018, 05:52 PM
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#21
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
MAVEN Selfie Marks Four Years in Orbit at Mars
I seem to remember there was a topic about spacecraft selfies, but I can't find it anymore |
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Dec 9 2021, 08:46 AM
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#22
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Solar System Cartographer Group: Members Posts: 10256 Joined: 5-April 05 From: Canada Member No.: 227 |
Poor old MAVEN doesn't get much love here, because it doesn't produce images. Except when it does. Here's a great new one from the IUVS instrument.
https://lasp.colorado.edu/home/maven/2021/1...card-from-mars/ And see more here: https://lasp.colorado.edu/home/maven/scienc...ing-highlights/ 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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Feb 18 2022, 02:57 AM
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#23
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Member Group: Members Posts: 447 Joined: 1-July 05 From: New York City Member No.: 424 |
After hunting down the Ingenuity presentation on Day 1 of the recent MPEAG meeting, I started listening to a lively MAVEN presentation by PI Shannon Curry. The video is on this page, https://mepag.jpl.nasa.gov/meetings.cfm, and her presentation starts at about 3:15. Really interesting.
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Jun 2 2022, 01:33 AM
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#24
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Senior Member Group: Members Posts: 1453 Joined: 26-July 08 Member No.: 4270 |
Apparently we almost lost the mission due to an IMU failure.
https://www.space.com/nasa-mars-spacecraft-maven-nearly-lost -------------------- -- Hungry4info (Sirius_Alpha)
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Jun 4 2022, 09:41 AM
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#25
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Member Group: Members Posts: 257 Joined: 28-October 12 Member No.: 6732 |
They surely took their time to tell the general public about the spacecraft's technical problems.
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Jun 4 2022, 04:54 PM
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#26
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Senior Member Group: Members Posts: 2547 Joined: 13-September 05 Member No.: 497 |
Apparently we almost lost the mission due to an IMU failure. I have no inside knowledge about this, but I suspect that the media reports have been somewhat modulated for dramatic effect. IMU problems and subsequent use of all-stellar mode is pretty old news. See "Verification of Mars Odyssey All-Stellar Attitude Determination Ten Years After Launch", Gingerich et al, 2015, https://ieeexplore.ieee.org/document/7119001 (paywalled, but available at https://www.researchgate.net/publication/30...rs_after_launch ) The wrinkle for MAVEN was that they had some failures that required some ground-commanded manipulation of onboard redundancy. On previous missions, the transition to all-stellar could be done in a more leisurely and measured fashion. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Jun 4 2022, 04:54 PM
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#27
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Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
MAVEN is not like a lander with regular releases of imagery, so it's much easier to conceal issues; I think that because the spacecraft was quickly saved, but then had to spend a lot of time finding new ways to operate and maintain attitude before science could begin, media attention would not have been very useful. Though we are only speculating on why it was hush-hush for so long.
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Jun 4 2022, 05:17 PM
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#28
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Senior Member Group: Members Posts: 2547 Joined: 13-September 05 Member No.: 497 |
Though we are only speculating on why it was hush-hush for so long. FWIW this was mentioned in the MEPAG report from about a month ago. https://www.lpi.usra.edu/mepag/meetings/mep...anson_Meyer.pdf slide 6. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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