Journey to Mt Sharp - Part 3: Cooperstown to Kimberley - Waypoint 3, Sol 453 [Nov14,'13] to 595 [Apr9,'14] |
Journey to Mt Sharp - Part 3: Cooperstown to Kimberley - Waypoint 3, Sol 453 [Nov14,'13] to 595 [Apr9,'14] |
Jan 14 2014, 04:53 PM
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#241
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
Absolutely fascinating, mars_armer. So I guess that explains the need for 5 degrees of freedom for the arm - that's the minimum that gives you complete position and pointing control for the turret (up to various limitations, of course).
It looks like the series is continuing: http://mars.jpl.nasa.gov/msl-raw-images/pr...FHAZ00216M_.JPG This would make a very cool animation... |
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Jan 14 2014, 05:16 PM
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#242
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Member Group: Members Posts: 215 Joined: 23-October 12 From: Russia Member No.: 6725 |
-------------------- My blog on Patreon
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Jan 14 2014, 05:54 PM
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#243
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
Once you choose a position for the turret and a direction for the camera to point, there are exactly four sets of joint angles that can put the turret in that position/orientation. The four solutions come from a choice of elbow up/down and wrist up/down. dear old Denavit-Hartenberg matrix inversion... |
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Guest_Actionman_* |
Jan 15 2014, 05:57 PM
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#244
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Guests |
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Jan 15 2014, 06:02 PM
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#245
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
I think something got broken off that bit of the rock and rolled to Solander Point to become Pinnacle Island.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 16 2014, 04:58 PM
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#246
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Member Group: Members Posts: 219 Joined: 14-November 11 From: Washington, DC Member No.: 6237 |
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Jan 17 2014, 02:44 PM
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#247
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 17 2014, 04:02 PM
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#248
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Member Group: Members Posts: 215 Joined: 23-October 12 From: Russia Member No.: 6725 |
-------------------- My blog on Patreon
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Jan 17 2014, 04:44 PM
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#249
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
That looks like a conglomerate rock, but instead of being a matrix with rounded streambed-like inclusions (as we saw at Hottah) it looks like a lot of sharper fragments, arranged willy-nilly like a "dog's breakfast" and with far more inclusions than matrix. I'd even be thinking breccia, but the clasts are a lot sharper and flatter than I would normally expect to see in a breccia.
The individual shards of rock appear to be layered as well -- very fine layers, when you look at the scale of the image. Oh, little rock, what stories do you have to tell? -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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Jan 17 2014, 05:01 PM
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#250
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
That is a cool rock, well spotted. I'd call those bright things "laths" and if it were on Earth I'd suspect an igneous or metamorphic rock and not a sedimentary rock right away. But this is Gale so....I don't know.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jan 17 2014, 10:03 PM
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#251
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Senior Member Group: Members Posts: 1057 Joined: 17-February 09 Member No.: 4605 |
I gather this is a float rock? Feldspar?
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Jan 17 2014, 10:54 PM
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#252
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Member Group: Members Posts: 155 Joined: 8-February 04 From: Phoenix, AZ USA Member No.: 9 |
... I'd call those bright things "laths" and if it were on Earth I'd suspect an igneous or metamorphic rock and not a sedimentary rock right away... Laths like these! These are typically plagioclase feldspar phenocrysts in a rock that formed from a slowly cooled magma. Hmmm, felsic/intermediate and deeper crustal, not your usual Mars float! -------------------- Tim Demko
BioLink site |
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Jan 18 2014, 12:08 AM
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#253
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
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Guest_Actionman_* |
Jan 18 2014, 12:34 AM
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#254
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Guests |
Another photo is posted ChemCam Sol 514 Zelenyikot.
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Jan 18 2014, 12:40 AM
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#255
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Laths like these! These are typically plagioclase feldspar phenocrysts in a rock that formed from a slowly cooled magma. Hmmm, felsic/intermediate and deeper crustal, not your usual Mars float! I always, always try to avoid making mineral diagnoses with only photographic evidence. One thing can look a lot like another thing. ChemCam had one of the laths in its crosshairs; if it's feldspar, we'll find out sooner or later. But I'm not gonna call it feldspar until somebody shows me a honking huge amount of aluminum and calcium or sodium. -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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