Mercury Flyby 3 |
Mercury Flyby 3 |
Sep 30 2009, 03:56 PM
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#61
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Classic. I'm very happy that their latest release is of this cool-looking double-ring basin, which was only half-seen on the previous flyby. -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Sep 30 2009, 04:34 PM
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#62
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
That just clinches it: there's an alien ship out there, tailing our spaceprobes, with a load of mischevious, drunk, giggling ET teenagers inside it, just waiting to fire their "Put little toy alien spacecraft into safe mode at just the worst possible moment!" ray at them...
Pesky alien kids!!! -------------------- |
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Sep 30 2009, 04:46 PM
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#63
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... 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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Sep 30 2009, 06:57 PM
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#64
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Member Group: Members Posts: 118 Joined: 18-November 07 Member No.: 3964 |
Yes, back in the old days, we didn't know to fear safe modes during flybys. But this time I did...
Was it actually first safe mode event for MESSENGER? |
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Oct 1 2009, 12:31 AM
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#65
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Member Group: Members Posts: 316 Joined: 1-October 06 Member No.: 1206 |
Some nice crater chains approx radial to that double ringed basin.
Does it have a name? P |
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Oct 1 2009, 12:41 AM
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#66
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Great reprojs, Phil!
Noticed a crater that's apparently been buried by a lava flow (arrowed). -------------------- 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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Oct 1 2009, 12:44 AM
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#67
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
Yes, and a similarly buried big double-ring basin near the top of the same image.
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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Oct 1 2009, 12:53 AM
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#68
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
I was struck by this one's symmetry...didn't have much time to melt down the rim walls, did it? Interesting.
-------------------- 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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Oct 1 2009, 07:17 AM
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#69
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
it will be nice when the images get here
http://pds-imaging.jpl.nasa.gov/Admin/reso..._messenger.html and i can remove the stripe from my map |
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Oct 1 2009, 01:46 PM
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#70
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Member Group: Members Posts: 214 Joined: 30-December 05 Member No.: 628 |
OK, no serious harm done this time but I sure hope there won't be a flyby #4 in March 2011.
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Guest_Sunspot_* |
Oct 1 2009, 01:49 PM
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#71
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Guests |
Maybe this story can shed some light on it? http://science.nasa.gov/headlines/y2009/29sep_cosmicrays.htm More cosmic rays.
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Oct 1 2009, 02:59 PM
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#72
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
OK, no serious harm done this time but I sure hope there won't be a flyby #4 in March 2011. I suspect they'll disable a bunch of fault handling before executing the MOI burn, the same way New Horizons plans to disable most of onboard fault protection during the Pluto flyby. -------------------- |
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Oct 1 2009, 03:05 PM
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#73
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Yeah -- fault handling on gravity assist flybys or opportunistic encounters is way, way different than for planned science flybys. Remember how OSIRIS on Rosetta safed before the Steins flyby, and how Dawn safed during its Mars flyby. On such encounters science is way, way down the list compared to spacecraft health. If the flyby is just for science, as with NH at Pluto and Mariner 10's Mercury flybys, then they disable a lot of the fault protection.
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Oct 1 2009, 03:07 PM
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#74
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Member Group: Members Posts: 214 Joined: 30-December 05 Member No.: 628 |
Galactic cosmic rays could have impacted the spacecraft at any time, regardless of its position relative to the planet.
The fact that this event came just as Messenger entered Mercury's shadow offers a strong hint that it was somehow related to that transition. That said, I guess some of those 7000+ stored flyby commands could have been corrupted by a CR incident, and we would not have discovered it until it came time to execute them. Note - This was WRT Sunspot's earlier post. The subsequent posts are acknowledged with some relief. |
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Oct 1 2009, 03:15 PM
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#75
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
That said, I guess some of those 7000+ stored flyby commands could have been corrupted by a CR incident, and we would not have discovered it until it came time to execute them. Commands are not typically as data intensive as science data so it's cheap to have several backup copies of them onboard. That goes for the flight software itself. There are ways very high priority maneuvers can be protected against memory and even processor trips via cosmic rays and several computers with redundant processing is one for example. -------------------- |
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