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Winter Quarters, at Low Ridge Haven
djellison
post Jul 11 2006, 07:39 PM
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Of you go and listen to the Squyres Q'n'A tongue.gif ...the question was asked back in September. The rover's don't care what sol it is, but the scripts on the ground do...and they've been edited to do 4 digit sol numbers.

Doug
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mhoward
post Jul 11 2006, 08:09 PM
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QUOTE (diane @ Jul 11 2006, 07:22 PM) *
I'm a bit more worried about 1024.


Oh, that's bad. smile.gif
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Tesheiner
post Jul 11 2006, 08:24 PM
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OT: What about MMB and S1K, Mike?
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mhoward
post Jul 11 2006, 08:52 PM
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QUOTE (Tesheiner @ Jul 11 2006, 08:24 PM) *
OT: What about MMB and S1K, Mike?


You know, I'm not entirely sure; I don't think there are any problems there, but I suppose it's getting to the point where I better check on it soon smile.gif

It's a nice problem to have - rovers that stay working for more than 1000 sols!
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djellison
post Jul 11 2006, 08:52 PM
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Until Pathfinder, 1000 sols+ was the norm wink.gif

Doug
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tedstryk
post Jul 12 2006, 11:25 AM
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Very true. We often forget Pathfinder was only a test mission, since it was launched even after the mission it was Pathfinding for was cancelled.


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hendric
post Jul 12 2006, 03:23 PM
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Just as a matter of comparison, here's the "lifetime" of the Viking landers:

CODE
Viking 1:
  Landed:          July 20, 1976
  Comms lost:      Nov. 11, 1982
  Earth days:      2305
  Mars Sols:       2247

Viking 2:
  Landed:          September 3, 1976
  Comms lost:      April 11, 1980
  Earth days:      1316
  Mars Sols:       1283

Data taken from www.solarviews.com


Go Sol 1300!!!


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"The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke
Mother Nature is the final inspector of all quality.
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mhoward
post Jul 12 2006, 03:41 PM
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What I love about this forum is that people actually take time to look up stuff like that.

I would say the Viking guantlet has been thrown down, then. Go MER!
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climber
post Jul 12 2006, 04:27 PM
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QUOTE (hendric @ Jul 12 2006, 05:23 PM) *
Just as a matter of comparison, here's the "lifetime" of the Viking landers:

CODE
Viking 1:
  Landed:          July 20, 1976
  Comms lost:      Nov. 11, 1982
  Earth days:      2305
  Mars Sols:       2247

Viking 2:
  Landed:          September 3, 1976
  Comms lost:      April 11, 1980
  Earth days:      1316
  Mars Sols:       1283

Data taken from www.solarviews.com


Go Sol 1300!!!


As Spirit will be 900 Sols old in 3 more sols, I was going to open up a topic about longevity and this sort of things. So fell free to move this if you want to.
My thinking was if this is fair to compare :
1- Landers versus Rovers
2- Flight-by Spacecrafts versus orbiting (specialy aerobraking ones)
3- Solar powered versus nuclear (hendric : your source for Vikings come from a site called "solarviews". For a nuclear powered spacecraft that's interesting blink.gif )
Another matter would be to compare designated life versus actual (Spirit is now 10 time), distance (Oppy is nearly 15 times), N° of pictures.
Anyhow, I guess we'll all want to celebrate the 10 times duration of Spirit. If Steve Squyres was to get such a boost he would be around in another 750-800 years! Not sure the rovers will be dead by then biggrin.gif


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ToSeek
post Jul 12 2006, 04:44 PM
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QUOTE (diane @ Jul 11 2006, 07:22 PM) *
I'm a bit more worried about 1024.


Most values stay on byte boundaries, so a value expected to exceed 255 (the one-byte limit) would most likely be stored in two bytes, which would mean we're good through Sol 65,535.
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diane
post Jul 12 2006, 05:00 PM
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QUOTE (ToSeek @ Jul 12 2006, 12:44 PM) *
Most values stay on byte boundaries, so a value expected to exceed 255 (the one-byte limit) would most likely be stored in two bytes, which would mean we're good through Sol 65,535.

A byte is whatever the designer says it is, and sometimes a specialized register such as a clock will be trimmed to the expected range of values. (I'm not going to show my age by reminiscing about machines with 6-bit bytes. Or machines that used 48 bits for a clock that was stored in a 64-bit word.)

That said, such designs typically show up in manufactured items, where economies of scale and planned obsolesence can make such short-sightedness pay off. I remember more than one experience of buying a new hard drive only to find that my PC's BIOS wouldn't address its whole capacity. It seems that the BIOS chip designers always incremented the sector address register size by two bits.
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Guest_Oersted_*
post Jul 12 2006, 06:35 PM
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Well, these rovers still need to travel many times as far to beat the mark of the very first robotic rovers, way back from the early 1970's...

http://en.wikipedia.org/wiki/Lunokhod
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djellison
post Jul 12 2006, 09:48 PM
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wink.gif

I think it's fair to say that those three are all different, and similarly different, and certainly it's fair to classify the third as a 'good candidate'

Doug
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jamescanvin
post Jul 13 2006, 12:22 AM
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One time limit on the rovers is the use of a 9 digit time in the image filenames.

If my maths is right then 1,000,000,000 seconds after 1/1/2000 11:58:55.816 UTC is on 9/9/2031.

That's sol 9841 for Spirit and 9820 for Oppy. Mark you calenders!

James


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ToSeek
post Jul 13 2006, 06:56 PM
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QUOTE (jamescanvin @ Jul 13 2006, 12:22 AM) *
One time limit on the rovers is the use of a 9 digit time in the image filenames.

If my maths is right then 1,000,000,000 seconds after 1/1/2000 11:58:55.816 UTC is on 9/9/2031.

That's sol 9841 for Spirit and 9820 for Oppy. Mark you calenders!

James


I'm hoping by that time there will be repairmen on Mars. wink.gif
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