Some Statistics for Spirit & Oppy, As the journey continues on Mars |
Some Statistics for Spirit & Oppy, As the journey continues on Mars |
Jul 3 2012, 07:24 PM
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#271
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Member Group: Members Posts: 754 Joined: 9-February 07 Member No.: 1700 |
Watching the Curiosity "Dune Buggy" vid got me wondering -- there are lots of examples of wheels spinning in the deep stuff without any actual forward progress. What's the record for a downhill slide by a MER? Could it have happened descending into Victoria Crater?
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Jul 3 2012, 10:23 PM
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#272
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
Watching the Curiosity "Dune Buggy" vid got me wondering -- there are lots of examples of wheels spinning in the deep stuff without any actual forward progress. What's the record for a downhill slide by a MER? Could it have happened descending into Victoria Crater? We did not skid that much in Duck Bay. There was one instance, sol 1305 I think, where we were driving cross slope around 20-25 degrees and we slid sideways unexpectedly. One instance where I remember we did skid was in the approach to the western rim of Santa Maria. We were doing a "K" drive (partly backwards, then do a K turn, AKA three point turn?, and then drive forward to the rim, can't recall the Sol # possibly in the 2500's. I was the RP and we did get unexpected skid in the backwards portion of the drive. It is also difficult to determine how much of the skid is due to actual skidding and what part comes from the fact that the wheel diameter is about 25 cm when driving on soft soil while it is 26.5cm when driving on bedrock (this drive was mostly on bedrock), the difference in diameter stems from whether you include the grousers or not. AFAIK we never driven on terrain that is so steep to cause skidding. Skidding would be worse than 100% slip. When you skid you have completely lost control of the vehicle path. The closest Oppy got to become a rock hugger was Wopmay in Endurance Crater, but even then we were driving cross-slope and managed to drive away. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jul 3 2012, 10:58 PM
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#273
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
Fascinating as always, Paolo, thanks. For the record, Santa Caterina was an area on the N rim of Victoria. Was it the approach to Santa Maria where she skidded/slipped?
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Jul 4 2012, 01:38 AM
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#274
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
Fascinating as always, Paolo, thanks. For the record, Santa Caterina was an area on the N rim of Victoria. Was it the approach to Santa Maria where she skidded/slipped? You are correct. I will edit my post. Thank you for pointing this out. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Aug 17 2012, 07:43 AM
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#275
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Sep 1 2012, 05:46 AM
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#276
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Member Group: Members Posts: 754 Joined: 9-February 07 Member No.: 1700 |
Opportunity has surpassed 35km of travel - universetoday article
QUOTE the Opportunity rover keeps on trucking, and has now exceeded over 35 kilometers (21.75 miles) of driving on its odometer! Quite an accomplishment for the Energizer Bunny of Mars rovers, now operating for 3,057 Martian sols. As the MER team says, “Not bad for a vehicle designed for only about 1 kilometer (.6 miles) of distance and 90 sols (days) of lifetime.”
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Sep 21 2012, 01:09 PM
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#277
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Oct 4 2012, 10:57 AM
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#278
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Senior Member Group: Members Posts: 2920 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Only numbers but well, another achievement: we just passed the 3000 sols after guarenty mark
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Oct 12 2012, 05:09 PM
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#279
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Monthly update:
Compared to previous martian summer, daily energy budget decreased by 10%; considering that Tau and dust factor were almost the same, this suggests further cells/battery degradation. Not sure if this could jeopardize next winter survival but I guess she will need a very good orientation station point in order to stay above 250W/sol... -------------------- I always think before posting! - Marco -
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Oct 13 2012, 12:19 AM
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#280
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
The problem could be calibration. We've seen that before. The tau and dust factor values they give need some model of the dust on the pancam lens. They periodically update that model. I'd be surprized if the batteries degraded that quickly, but who knows...
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Nov 15 2012, 09:17 PM
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#281
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Dec 26 2012, 08:38 AM
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#282
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Jan 15 2013, 10:42 PM
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#283
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Member Group: Members Posts: 194 Joined: 3-January 10 Member No.: 5156 |
-------------------- Need more input ...
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Jan 19 2013, 04:30 PM
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#284
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Jan 19 2013, 05:31 PM
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#285
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Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
Excellent work
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