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Post Block Island Meteor Studies (The Western Route), The 6th Leg in our Zig Zag Journey to Endeavour Crater
Tesheiner
post Sep 19 2009, 04:15 PM
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QUOTE (Bill @ Sep 19 2009, 10:14 AM) *
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 ? unsure.gif


The former. It answers my question from some days ago.

QUOTE (brellis @ Sep 19 2009, 05:57 PM) *
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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Stu
post Sep 19 2009, 05:02 PM
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Some lovely blocks around the edge of the latest crater in Oppy's tour...

http://twitpic.com/ibf9b


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CosmicRocker
post Sep 20 2009, 04:40 AM
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QUOTE (Tesheiner @ Sep 19 2009, 11:15 AM) *
... 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.


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djellison
post Sep 20 2009, 07:16 AM
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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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HughFromAlice
post Sep 20 2009, 11:48 AM
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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.

Attached Image
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Stu
post Sep 20 2009, 11:59 AM
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Definitely not a "rock garden" to wander into...

Attached Image


Fascinating geology here tho...


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HughFromAlice
post Sep 20 2009, 02:03 PM
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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.

Attached Image


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 - sad.gif )
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dvandorn
post Sep 20 2009, 04:05 PM
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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


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HughFromAlice
post Sep 20 2009, 10:44 PM
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QUOTE (dvandorn @ Sep 21 2009, 01:35 AM) *
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 -
Attached Image


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 -
Attached Image
.....
Attached Image


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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Juramike
post Sep 20 2009, 11:51 PM
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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?)


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serpens
post Sep 21 2009, 04:51 AM
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QUOTE (HughFromAlice @ Sep 20 2009, 11:44 PM) *
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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Stu
post Sep 21 2009, 05:58 AM
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3d view...

Attached Image


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Ant103
post Sep 21 2009, 07:44 AM
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The Sol 2010 panoramic view :


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RobertEB
post Sep 21 2009, 01:08 PM
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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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Airbag
post Sep 21 2009, 05:56 PM
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QUOTE (djellison @ Sep 17 2009, 01:46 AM) *
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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