Post-Conjunction at Home Plate North, Getting ready to leave |
Post-Conjunction at Home Plate North, Getting ready to leave |
Dec 29 2008, 05:05 AM
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#31
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
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Dec 29 2008, 06:04 AM
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#32
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
Perhaps it's premature to join the cheerleaders, but are these rovers fortunate, or what? Can someone toss us a bone, for crying out loud?
-------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Dec 29 2008, 02:27 PM
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#33
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
While still waiting for new Whr figures, just one remark for those comparing the two navcams I posted before. The idea was to have a reference picture together with the latest image to be sure what we were seeing was real and not an image artifact. If anybody wants to make comparisions about dust levels on them, remember that the first picture was taken about one year ago and not last week.
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Dec 29 2008, 06:01 PM
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#34
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Member Group: Members Posts: 133 Joined: 3-June 06 From: the jungle of Nool Member No.: 799 |
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Guest_Oersted_* |
Dec 29 2008, 11:29 PM
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#35
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Guests |
But Horton, that comparison is not with an image taken after the possible cleaning event, is it?
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Dec 30 2008, 12:10 AM
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#36
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Member Group: Members Posts: 133 Joined: 3-June 06 From: the jungle of Nool Member No.: 799 |
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Dec 31 2008, 02:00 PM
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#37
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
The 1772 R2 pancam image when posted hopefully will show more change. Here is a gif flick between the sol 1761 and 1772 'dust_motion' pancams -------------------- |
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Dec 31 2008, 03:51 PM
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#38
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Something's definitely happened, but those few cells visible in the Pancam frames are less convincing that the large streaks across the right rear array on the Navcam shots.
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Dec 31 2008, 03:55 PM
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#39
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
I think that this pancam is pointed at the rear of the right side array which shows very little change compared to other parts shown in the navcam image.
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Dec 31 2008, 04:04 PM
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#40
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
I think that this pancam is pointed at the rear of the right side array which shows very little change compared to other parts shown in the navcam image. That is correct. This pancam subframe was used to compare its vew with the same pancam subframe we captured during the first attempt to drive uphill. 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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Dec 31 2008, 11:11 PM
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#41
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Junior Member Group: Members Posts: 63 Joined: 18-November 08 Member No.: 4490 |
I was wondering - as you know, Spirit is trying to climb up a fairly steep slope. Looking at the direction of the dust streaks as it appears to "clear", could that be consistant with mechanical vibration aiding the clearance, or is that not possible - so this is purely the wind doing the work? To what extent could the clearing be an optical illusion - ie, when there is bright light fully reflected by the panels, they appear dusty, when not, the dusty patterns on the dark panels stand out..
Just my 2 cents.. |
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Dec 31 2008, 11:43 PM
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#42
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Member Group: Members Posts: 206 Joined: 15-August 07 From: Shrewsbury, Shropshire Member No.: 3233 |
I was wondering if the dust movement was caused by a Marsquake.
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Jan 1 2009, 12:15 AM
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#43
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Member Group: Members Posts: 293 Joined: 22-September 08 From: Spain Member No.: 4350 |
But Mars crust is dead, and probably a quake strong enough to shake the rover would make a lot of dust go airborne over Gusev.
A very small vibration can't be the solution, or that shaking mode they tried to clean the MiniTES mirror would have been enough. |
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Jan 1 2009, 12:51 AM
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#44
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Member Group: Members Posts: 206 Joined: 15-August 07 From: Shrewsbury, Shropshire Member No.: 3233 |
But Mars crust is dead, and probably a quake strong enough to shake the rover would make a lot of dust go airborne over Gusev. The Viking seismometer did not detect any Marsquakes. However as this abstract makes clear the seismometer was not very sensitive and only worked on none windy days: http://adsabs.harvard.edu/abs/1979GeoRL...6..368G It is stated in this article that a picture taken by MRO may be evidence of a Marsquake: http://www.universetoday.com/2008/03/03/hi...ches-in-action/ |
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Jan 1 2009, 08:41 AM
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#45
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Member Group: Members Posts: 293 Joined: 22-September 08 From: Spain Member No.: 4350 |
There must be a minimum seismic level the MER can directly sense if it tries to.
Would the vibration trigger the dust devil capture program if it was running (and would the microscope be able to capture movement if it was looking)? About the avalanches, I remember from high school geology that thermal expansion, abrasion, frost weathering, weight removal or even haloclastia or chemical weathering could be involved. |
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