Southward from San Antonio to the Next Waypoint |
Southward from San Antonio to the Next Waypoint |
Apr 2 2010, 03:38 AM
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Member Group: Members Posts: 139 Joined: 14-October 05 From: Toronto, Canada Member No.: 529 |
It seems about the right time to start a new thread as we have now turned East to Endeavour.
Hope no one minds... -------------------- -- Robin
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Apr 8 2010, 06:10 PM
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#2
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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 9 2010, 12:07 AM
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#3
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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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