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MAVEN Orbital Science, Post Siding Spring
bobik
post Mar 4 2017, 07:55 AM
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I must confess that this press release sounds a little bit hyped-up to me. huh.gif Flybys at Phobos of Mars Express are known and science investigations are planned months in advance.
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nprev
post Mar 4 2017, 08:42 AM
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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. smile.gif


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Decepticon
post Mar 4 2017, 05:56 PM
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Are any science observations being done by Maven?

The article doesn't state if it will?
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Explorer1
post Mar 4 2017, 06:45 PM
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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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nprev
post Mar 4 2017, 07:29 PM
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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.


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Paolo
post Sep 21 2018, 05:52 PM
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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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Phil Stooke
post Dec 9 2021, 08:46 AM
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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


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Tom Tamlyn
post Feb 18 2022, 02:57 AM
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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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Hungry4info
post Jun 2 2022, 01:33 AM
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Apparently we almost lost the mission due to an IMU failure.
https://www.space.com/nasa-mars-spacecraft-maven-nearly-lost


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bobik
post Jun 4 2022, 09:41 AM
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They surely took their time to tell the general public about the spacecraft's technical problems. huh.gif
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mcaplinger
post Jun 4 2022, 04:54 PM
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QUOTE (Hungry4info @ Jun 1 2022, 06:33 PM) *
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.


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Explorer1
post Jun 4 2022, 04:54 PM
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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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mcaplinger
post Jun 4 2022, 05:17 PM
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QUOTE (Explorer1 @ Jun 4 2022, 08:54 AM) *
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.


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