Southward from San Antonio to the Next Waypoint |
Southward from San Antonio to the Next Waypoint |
Apr 8 2010, 06:10 PM
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#61
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Junior Member Group: Members Posts: 82 Joined: 22-July 05 From: Portugal Member No.: 445 |
well... then maybe they want to take a close look at what exact conditions tripped the embedding detector so they can avoid more occurrences like these.
Guess I'm hoping all is right and just trying to think at positive scenarios. Slow days like today at the forum mars section with no progress and no pictures really bring the marsaholic withdrawall synptoms to light and give a glimpse of what it'll be like once these wonders stop roving. |
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Apr 8 2010, 06:43 PM
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#62
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Looking for something to do on Mars? Rove over the latest HiRISE releases, or, better yet, wander through the CTX archive (http://bit.ly/csbOd9) -- nobody is paying much attention to those and there are boatloads of stunning photos.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Apr 8 2010, 09:58 PM
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#63
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Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
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Apr 9 2010, 12:07 AM
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#64
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Member Group: Members Posts: 236 Joined: 5-June 08 From: Udon Thani Member No.: 4185 |
Guess I'm hoping all is right and just trying to think at positive scenarios. see http://marsrovers.jpl.nasa.gov/mission/sta...tml#opportunity QUOTE OPPORTUNITY UPDATE: Sharp Turns Make Driving Difficult - sols 2200-2204, April 2-6, 2010:
Opportunity had a couple of difficult moves this week. After taking some time to recharge her batteries, the rover attempted a drive on Sol 2202 (April 4, 2010). That drive stopped after the initial arc turn due to elevated current draw in the motors on the right side of the rover. The rover is between two ripples with the space in between forming a bowl. The rover had to push harder on the right to make the sharp turn. Conservatively-set current limits stopped the drive, as a way for controllers on the ground to assess the driving conditions before proceeding. With everything looking okay, another drive on Sol 2204 (April 6, 2010), was commanded. It too began with a short, sharp arc. This time the drive stopped after a short distance because of wheel slip exceeding the limit of 40 percent. Again ground controllers assessed the conditions and found no problems. With these sharp turns, the rover's wheels must impart more thrust. When the wheel thrust exceeds the shear strength of the terrain, slip occurs. Opportunity will drive again on Sol 2206 (April 8, 2010). This time the rover is already aligned with the drive direction, so no sharp turns are needed. Extra slip checks will be performed to make sure there are no terrain issues. As of Sol 2204 (April 6, 2010), the solar array energy production was 235 watt-hours with an atmospheric opacity (tau) of 0.371 (from Sol 2199) and a dust factor of 0.500. Total odometry is 20,247.56 meters (20.25 kilometers, or 12.58 miles). |
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Apr 9 2010, 12:24 AM
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#65
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Thanks, Geert. All is well. -------------------- 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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Apr 9 2010, 05:45 AM
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#66
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Yep. The drive was successful and 50m were covered during 2206.
But the images are still unavailable. |
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Apr 9 2010, 07:31 AM
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#67
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
IIRC, Spirit RF died right after a sharp turn. May be the problem has nothing to do with the sharp turn but, I still don't understand why we're still using this manoeuver instead of backing off a bit and use a smoother turn.
Sorry if my remark is a bit "sharp" (ok, I'm a back seat driver etc) but I've been afraid since march 12th 2006 using this manoeuver again. Is the current rise showing I've been right? -------------------- |
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Guest_Sunspot_* |
Apr 9 2010, 07:47 AM
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#68
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Guests |
Its been offline for as long as 10 days before.
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Apr 9 2010, 08:02 AM
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#69
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
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Apr 9 2010, 10:55 AM
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#70
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Yep, good point Doug!
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Apr 11 2010, 08:54 AM
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#71
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Thread bump, althought there's not so much to discuss given the lack of images. The official website is not updating too so my guess it that the issue should be in the common feed from JPL (assuming that common point exists).
Meanwhile, just say that the drive on sol 2208 was executed and another 55m were added to the odometer. Here are some navcam thumbnails from the tracking website. |
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Apr 11 2010, 10:01 AM
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#72
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Member Group: Members Posts: 239 Joined: 18-December 07 From: New York Member No.: 3982 |
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Apr 11 2010, 10:16 AM
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#73
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
I did the same thing (similar result) to obtain a polar view and see if it was not too bad to use on "fine tuning" the rover position on the map. The mobility info from the tracking site is not perfect and usually there are a few meters difference wrt the position I get by means of mosaics registration on the map.
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Apr 11 2010, 03:18 PM
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#74
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
I noticed that the pancam drive direction images are aimed to the east.
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Apr 11 2010, 04:14 PM
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#75
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Solar System Cartographer Group: Members Posts: 10190 Joined: 5-April 05 From: Canada Member No.: 227 |
Yes, they just bypassed a clump of larger drifts.
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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