Spring at Cape York, Sol 2947 (after Greeley Haven) - sol 3040 |
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Spring at Cape York, Sol 2947 (after Greeley Haven) - sol 3040 |
 Jul 5 2012, 02:02 AM
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#226
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 Senior Member  Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197  |
QUOTE (ngunn @ Jul 4 2012, 05:55 AM)  (I assume those are at one Earth year intervals.) They are really just random grabs spread out from Sol 2 to the present. -------------------- If Occam had heard my theory, things would be very different now.
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Jul 5 2012, 05:48 AM
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#227
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 Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Grasberg1
Sol3001: Via Odyssey Ah! Did you see what I did there?!  
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Jul 5 2012, 10:14 AM
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#228
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 Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
QUOTE (ElkGroveDan @ Jul 5 2012, 03:02 AM) They are really just random grabs spread out from Sol 2 to the present. Well you luckily managed to sample aphelion and perihelion well enough to show the periodic variation. I'd really love to see a full 8 year movie. I was wondering whether such a movie would also show the variations in atmospheric opacity, or is that somehow normalised out in the imaging process? |
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Jul 5 2012, 04:08 PM
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#229
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 Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
I have assembled all of the pancam tau images (4779!) I could find.
 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 5 2012, 04:26 PM
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#230
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Senior Member Group: Members Posts: 2998 Joined: 30-October 04 Member No.: 105 |
QUOTE (mhoward @ Jul 4 2012, 11:27 AM) So I guess we've answered that question: no, there is not any type of MER image that we find uninteresting Think "analemma"...  (Attached is a view facing north and about 45 degrees up, with the sun images from sols 2816-2914.) --Bill -------------------- |
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Jul 5 2012, 05:23 PM
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#231
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 Member Group: Members Posts: 206 Joined: 15-August 07 From: Shrewsbury, Shropshire Member No.: 3233 |
QUOTE (RoverDriver @ Jul 5 2012, 05:08 PM) I have assembled all of the pancam tau images (4779!) I could find. Paolo Has a sunspot ever been seen in a pancam tau image? I remember in about 1976 seeing a large sunspot using my naked eye when the sun was close to the horizon. I wonder if that sunspot would have been visible in a pancam tau image? |
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Jul 5 2012, 06:44 PM
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#232
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (PaulM @ Jul 5 2012, 09:23 AM) Has a sunspot ever been seen in a pancam tau image? I remember in about 1976 seeing a large sunspot using my naked eye when the sun was close to the horizon. I wonder if that sunspot would have been visible in a pancam tau image? I hope not. The IFOV (instantaneous field of view, the field of view of 1 pixel) is about 50" (arc seconds), the sun spot would need to be be quite big! Pancam Tau are taken usually around 1100-1200, so no atmospheric magnification. 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 5 2012, 07:22 PM
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#233
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
QUOTE (RoverDriver @ Jul 5 2012, 05:08 PM) I have assembled all of the pancam tau images (4779!) I could find. Hey, that's great! Thanks. But with sooooo many images the seasonal 'breathing' though quite apparent is almost imperceptibly slow. |
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Jul 5 2012, 07:23 PM
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#234
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
QUOTE (Astro0 @ Jul 4 2012, 09:48 PM) Ah! Did you see what I did there?! I see so many little veins in Grasberg that Carly Simon could write a song about it. -------------------- If Occam had heard my theory, things would be very different now.
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Jul 5 2012, 07:24 PM
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#235
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (ngunn @ Jul 5 2012, 11:22 AM) Hey, that's great! Thanks. But with sooooo many images the seasonal 'breathing' though quite apparent is almost imperceptibly slow.OK, I will see what I can do. 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 5 2012, 07:25 PM
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#236
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 Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
Thanks for that solar compilation, Paolo. There should be several transits visible, but I haven't inspected each of the 4779 frames yet!
Back to what Oppy's up to now, here's a pancam anaglyph showing the "mini-notch" to our NE:
It looks like a fair bit of relief, which bodes well for relief at the real notch (Whim Creek). |
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Jul 5 2012, 07:30 PM
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#237
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
QUOTE (RoverDriver @ Jul 5 2012, 08:24 PM) OK, I will see what I can do. Hey, wait a minute, don't you have a rover to drive? 
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Jul 5 2012, 07:48 PM
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#238
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (fredk @ Jul 5 2012, 11:30 AM) Hey, wait a minute, don't you have a rover to drive? I wish, my next shift is on 7/18! I had some spare time while waiting for one more simulation to complete, so I gathered the data and used whirlgif to generate the animation. 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 5 2012, 11:27 PM
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#239
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
This is an animation of 747 frames that are separated by a bit more than 1 Sol. The variation in size of the Sun is now clearly visible.
 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 6 2012, 12:04 AM
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#240
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
OK, more fun with the tau images. For each of the tau images I binarized the images (fixed threshold @127) and counted the white pixels, finally, from the area I computed teh diameter. The attached plot shows the variation of Sun diameter vs Sol. Pretty crude and it shows, but it gives an idea of the variation.
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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