Perseverance valley |
Perseverance valley |
Jul 4 2017, 05:11 AM
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#1
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Member Group: Members Posts: 362 Joined: 13-April 06 From: Malta Member No.: 741 |
Time for another topic, me thinks.
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Jul 19 2017, 04:31 PM
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#2
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
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Jul 24 2017, 04:42 AM
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#3
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Member Group: Members Posts: 807 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
We're starting to see some clouds as we head towards winter. Here's an navcam animation from 4793: This is a stretched difference of each frame from the average of the frames. Hi Fred, The originals have that bright 'half moon' in the lower third of the frames (which I think you chopped off) What is that bright area? -------------------- CLA CLL
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Jul 24 2017, 02:02 PM
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#4
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
Hi Fred, The originals have that bright 'half moon' in the lower third of the frames (which I think you chopped off) What is that bright area? It is caused by the dust of times. ;-) The small hood we have in front optical element only partly occludes the Sun. Therefore, even when the Sun is outside the field of view it will illuminate the dust which causes diffusion and enters the optical path. Most of the dust was accumulated around Sol 1200+ (2007) but during the years the wide have cleaned up the front elements quite a bit. 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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