NASA rover reboots twice over Easter weekend |
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NASA rover reboots twice over Easter weekend |
 Apr 19 2009, 01:35 AM
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#16
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Member  Group: Members Posts: 204 Joined: 29-June 05 Member No.: 421  |
QUOTE (ilbasso @ Apr 18 2009, 08:03 PM)  Can someone please explain in clearer English this extract from the above-referenced update: "no sol number for Spirit corresponded to April 2, 2009, using the criterion of the date in Los Angeles at local solar noon on Mars"? A solar day on mars is a bit longer than a day on earth -- about 24 hours 39 minutes (per wikipedia -- http://en.wikipedia.org/wiki/Timekeeping_on_Mars). When they convert Martian sols to Earth dates, they are saying they take the date as the date in Los Angeles at the time of solar noon for the rover. With the slightly longer Martian day, it must have worked out that noon on sol 1865 landed just before midnight on April 1st while noon on sol 1866 landed in the wee hours of the morning on April 3, twenty-four and a half hours later (or so). --Travi |
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Apr 19 2009, 01:56 AM
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#17
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 Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Travi, thanks. Had to read that twice before I got it, but makes sense.
-------------------- 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 19 2009, 08:23 PM
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#18
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 Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
QUOTE (tfisher @ Apr 18 2009, 08:35 PM) A solar day on mars is a bit longer than a day on earth -- about 24 hours 39 minutes... Since an Earth day has 1440 minutes and a Mars day is 39 minutes longer than an Earth day, there are about 38 Earth days for every 37 Mars sols.* So it makes mathematical sense that when corresponding Earth days to Martian sols, a day needs to be "lost" every 37 sols. *1440/39 = 36.92 (That's the extent of my math prowess, no orbital calculations for me!  )
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Apr 20 2009, 06:31 PM
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#19
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
Speaking of reboots - the raw image pipeline just flushed
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| Guest_Sunspot_* |
Apr 20 2009, 06:34 PM
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#20
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Guests |
...still alive then?
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Apr 20 2009, 07:29 PM
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#21
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
No commanded remote sensing, but downlinking of older data is occurring on the PCDB
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Apr 20 2009, 07:38 PM
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#22
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
QUOTE (djellison @ Apr 20 2009, 08:31 PM) Speaking of reboots - the raw image pipeline just flushed Ahh! Now I can have my mars fix!
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Apr 20 2009, 08:07 PM
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#23
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 Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
Well, to look on the bright side: looks like these kind of delays mean the rovers have time to send back plenty of old navigation images.
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Apr 21 2009, 02:32 AM
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#24
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 Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
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Apr 21 2009, 02:45 AM
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#25
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Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
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Apr 21 2009, 02:56 AM
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#26
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Hmm indeed. Hope we're not heading into the land of complex/unusual failure modes that systems advanced in years too often enter. (The last years of both the F-4 & the C-141 were often quite bizarre in this regard...)
-------------------- 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 21 2009, 09:11 PM
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#27
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Emily posted updated information in the Planetary Society blog: Spirit Update: Generally healthy, but "amnesiac?"
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Apr 21 2009, 10:39 PM
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#28
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Member Group: Members Posts: 530 Joined: 21-March 06 From: Canada Member No.: 721 |
Speaking of failing brains, I read that 3 times before I parsed anything but "Emily Post updated the information..."
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