Post Block Island Meteor Studies (The Western Route), The 6th Leg in our Zig Zag Journey to Endeavour Crater |
Post Block Island Meteor Studies (The Western Route), The 6th Leg in our Zig Zag Journey to Endeavour Crater |
Sep 19 2009, 04:15 PM
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#31
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Does anybody understand something about the name of the craters here ? For tosol they plan : 02010 p2410.20 0 0 0 0 0 0 pancam_Nereus_11x2_L257R2 02010 p2559.23 0 0 0 0 0 0 pancam_Nereus_ejecta_L234567Rall Is Nereus the new name of Dolphin or the name of the next small crater on the way ? The former. It answers my question from some days ago. Regarding the color panoramic in Ant's post 25, what causes the dark marks along the path? Does the rover stop at regular intervals during a drive? How does that work with the auto-nav update? Apologies as I presume this has been answered, but my searches don't lead me to it. The marks come from the wheels' surface which is not uniform. Let's see if I can find a picture... |
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Sep 19 2009, 05:02 PM
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#32
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
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Sep 20 2009, 04:40 AM
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#33
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
... The marks come from the wheels' surface which is not uniform. Let's see if I can find a picture... This picture is probably a good example. Each wheel's tread pattern contains what has sometimes been called a "star pattern." It occurs once on each wheel's circumference and serves to punctuate what would otherwise be monotonous and mostly featureless tracks in the soil. The patterns create repetitive features in the rover's wheel tracks that are useful for auto-navigation and other functions. -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Sep 20 2009, 07:16 AM
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#34
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
The star patttern isn't there for fun though, it's where the wheels were bolted down onto the lander deck for launch, cruise and landing.
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Sep 20 2009, 11:48 AM
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#35
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Member Group: Members Posts: 237 Joined: 22-December 07 From: Alice Springs, N.T. Australia Member No.: 3989 |
Interesting rocks - so here's a b/w stitch of 4 left pancam images Sol 2010. Enhanced the originals to bring out as much detail as I could, although posted here at 15% below full res to get under the 1 Meg limit.
They've all been taken through basically the same filter (754/3nm - red) - so haven't gone beyond black and white. Hope jpegs taken through other filters are available soon as this set would be good fun to make a colour pic out of. |
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Sep 20 2009, 11:59 AM
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#36
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
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Sep 20 2009, 02:03 PM
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#37
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Member Group: Members Posts: 237 Joined: 22-December 07 From: Alice Springs, N.T. Australia Member No.: 3989 |
Decided to colourize it anyway - sort of how I imagine it might look! If I had a bit more time I would get rid of the white areas on the rocks as they should be coloured.
Stu - loved your anaglyph..... as always! You wouldn't want to be wandering around in your spacesuit amongst that lot during the night without a really good torch! (Rip - ) |
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Sep 20 2009, 04:05 PM
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#38
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
Hmmm... not only are there two specific types of rocks in the B&W images, one appearing white and the other appearing darker gray, there are several rocks in the image which show both rock types within the same rock. You can see in several rocks a contact between the light and darker rock types. And in a couple of cases, the faces are oriented exactly the same on both sides of the contact, so this can't just be an artifact of illumination angle.
I will say that there seems to be absolutely no difference in how the two different types of rocks have weathered -- i.e., those rocks which exhibit contacts don't exhibit weathering differences on the different sides of the contacts. So, whatever is causing the albedo difference is not changing the overall softness of the rocks. I'd have to think this shows some form of compositional change. This is the first place in a while where I wish the APXS and the Mossbauer were still working as quickly as they did a couple of years ago... -the other Doug -------------------- The trouble ain't that there is too many fools, but that the lightning ain't distributed right. -Mark Twain
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Sep 20 2009, 10:44 PM
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#39
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Member Group: Members Posts: 237 Joined: 22-December 07 From: Alice Springs, N.T. Australia Member No.: 3989 |
two specific types of rocks in the B&W images, can't just be an artifact of illumination angle. I wish the APXS and the Mossbauer were still working - the other Doug You've made an interesting point Doug. It was this sort of rock that made me think that the whiteness was probably due to an artifact of camera exposure or illumination. (Plus I only know a very little about geology!) 1 - But when I relook at things in the light of your comments and come across this ... the white area on the top of the taller rock in the front 2 - then I get what you mean. The slab behind it...... does it look to you as if it could be made up of two different rock types? It is certainly an interesting place. It would have been great to stop, but having just been to Teishner's lastest map, it looks as if Sol 2011 may have taken us past here. |
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Sep 20 2009, 11:51 PM
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#40
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
I'm not sure, but I strongly suspect it might be an effect of sun angle glinting off flat surfaces of the rock.
(The shadows indicate we are looking close to the direction of the sun.) It'd be neat if there were observations done at a different time....(are there?) -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Sep 21 2009, 04:51 AM
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#41
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Senior Member Group: Members Posts: 1043 Joined: 17-February 09 Member No.: 4605 |
But when I relook at things in the light of your comments and come across this ... the white area on the top of the taller rock in the front I don't see any difference other than angle of illumination. if it was indeed a compositional change then it should be evident in the side of the rock closest to us. |
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Sep 21 2009, 05:58 AM
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#42
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
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Sep 21 2009, 07:44 AM
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#43
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Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
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Sep 21 2009, 01:08 PM
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#44
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Junior Member Group: Members Posts: 57 Joined: 17-May 06 From: Houston, Texas Member No.: 776 |
Quote removed - Mod
The rocks look like they are full of blueberries. I wish they could take a closer look at those layered rocks. -------------------- |
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Sep 21 2009, 05:56 PM
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#45
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Member Group: Members Posts: 408 Joined: 3-August 05 Member No.: 453 |
Nope - but UMSF, as ever, sent Birthday Cards to Cornell and JPL. I can personally vouch for the fact that the 3rd anniversary card enjoys pride of place in the middle of the table in one of the Ops rooms in Cornell. And many of you will like this - overheard during last Monday's Opportunity SOWG: "Drive, baby, drive!". All systems normal (including that one wheel's motor current) except for the mini-TESS' still present dust layer of course. They will leave the aperture open and hope to just get lucky one day with the wind coming from *just* the right direction to blow at least some of the dust off the mirror. Batteries also in great shape still. Expect plenty more Westward travel before turning South, but that is not a surprise of course. Airbag |
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