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The Top of Vera Rubin Ridge Part 2, Site 67-, sol 1944-, 24 Jan 2018-
jvandriel
post Jun 21 2018, 09:28 PM
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The Navcam L view on Sol 2087.

Jan van Driel

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jccwrt
post Jun 21 2018, 10:27 PM
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And the drive-direction mosaic:

Vera Rubin Ridge - Curiosity
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fredk
post Yesterday, 12:51 AM
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I'm not sure which sol we hit tau > 8 in Gale, but on 2086 the sun was still visible in MR:
http://mars.jpl.nasa.gov/msl-raw-images/ms...040C00_DXXX.jpg
I'm guessing that frame was without solar ND filter, since several frames around that sol show almost nothing and presumably did use the ND filter. So the sun wasn't very bright, as you'd expect for a roughly e^{-8} ~ 1/3000 attenuation.
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marsophile
post Yesterday, 02:48 AM
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http://redplanet.asu.edu/?p=29635

Plan to use chemcam on the dusty air.
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jccwrt
post Yesterday, 04:21 AM
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QUOTE (fredk @ Jun 21 2018, 06:51 PM) *
I'm not sure which sol we hit tau > 8 in Gale, but on 2086 the sun was still visible in MR:
http://mars.jpl.nasa.gov/msl-raw-images/ms...040C00_DXXX.jpg
I'm guessing that frame was without solar ND filter, since several frames around that sol show almost nothing and presumably did use the ND filter. So the sun wasn't very bright, as you'd expect for a roughly e^{-8} ~ 1/3000 attenuation.


The most recent frame for tau measurement that had been downlinked when that press release came out was on Sol 2079, so either it was estimated from a thumbnail image or the landscape images from sols 2084/2085. You can barely see the sun in the Sol 2085 right MastCam image (I was only able to see the right half of the disk), so I wouldn't be surprised if the tau measurement of 8 was from an earlier sol. It looks closer to Opportunity's last image from Meridiani Planum, but I don't know how the two rovers' ND filters compare to one another.
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jvandriel
post Yesterday, 02:03 PM
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The MASTcam L view on Sol 2084-2087.

Jan van Driel

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jvandriel
post Yesterday, 02:53 PM
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and the Navcam L view on Sol 2086.

Jan van Driel

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jvandriel
post Today, 01:45 PM
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The Navcam L view on Sol 2089.

Jan van Driel

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mcaplinger
post Today, 03:16 PM
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QUOTE (jccwrt @ Jun 21 2018, 08:21 PM) *
I don't know how the two rovers' ND filters compare to one another.

The filters are basically the same (440 nm and 880 nm centers, ND5 neutral density) but obviously the cameras are quite different in their pixel size, f/number, and quantum efficiency.

But without knowing the exposure times of the images (alas, not available until PDS archiving AFAIK) it's tough to figure out the radiometry.


--------------------
Disclaimer: This post is based on public information only. Any opinions are my own.
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