From Concepción to the "Twin Craters", and beyond... |
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From Concepción to the "Twin Craters", and beyond... |
 Mar 30 2010, 12:51 AM
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#166
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Member  Group: Members Posts: 567 Joined: 4-September 06 From: Boston Member No.: 1102  |
Dust death trap--no way!
-------------------- Floyd
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Mar 30 2010, 01:24 AM
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#167
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 Senior Member Group: Moderator Posts: 6474 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
My sediments exactly. (insert snare-drum rim shot here!)
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Mar 30 2010, 05:04 AM
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#168
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 Senior Member Group: Members Posts: 2164 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
Aręte is a geomorphology term with glacial implications. It is a ridge formed between two cirques or two U-shaped glacial valleys. As such, it is probably inappropriate to use it to describe the ridge between these two craters.
-------------------- ...Tom (thinks he should use more emoticons)
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Mar 30 2010, 05:29 AM
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#169
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 The Poet Dude Group: Moderator Posts: 5546 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
QUOTE (Bobby @ Mar 30 2010, 12:24 AM)  How safe does it look like for the Rover to go inside this crater to investigate any exposed bedrock??? About as safe as it looks for Kevin Bacon to walk across a stretch of open desert...  QUOTE (nprev @ Mar 30 2010, 02:24 AM) My sediments exactly. (insert snare-drum rim shot here!) You should be ashamed of that... -------------------- |
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Mar 30 2010, 12:13 PM
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#170
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Senior Member Group: Members Posts: 2253 Joined: 30-October 04 Member No.: 105 |
There isn't a name for a terrestrial equivalent to this feature. What we have here is a feature created by the combination of two ejecta curtains being simultaneously emplaced. We probably need to draw from whatever terminology has been created to describe crater ejecta features-- I shudder to think at the Latin/Greek/archaicEnglish that would get cobbled together for that term.
"Isthmus" is as good as anything. But in keeping with naval terminology, p'haps it can be called a gangplank? --Bill -------------------- |
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Mar 30 2010, 01:21 PM
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#171
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 Member Group: Members Posts: 316 Joined: 1-May 06 From: Scotland (Ecosse, Escocia) Member No.: 759 |
I do believe "Septum" is the correct term , as I said in Post 152. Septum is used in lunar morphology, and also terrestrial volcanic craters. If you Googgle "septum crater" you will find several examples of this usage.
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Mar 30 2010, 03:28 PM
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#172
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Senior Member Group: Members Posts: 4512 Joined: 5-April 05 From: Canada Member No.: 227 |
Don't worry, people - soon the wretched feature will be far behind us.
Phil -------------------- ... because the Solar System ain't gonna map itself.
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Mar 30 2010, 05:19 PM
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#173
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 Senior Member Group: Members Posts: 1967 Joined: 28-December 04 Member No.: 132 |
QUOTE (kenny @ Mar 30 2010, 08:21 AM) I do believe "Septum" is the correct term... Septum is used in lunar morphology...
"The elongate crater Torricelli near the north margin of Mare Nectaris was probably formed by two simultaneous impacts as indicated by the partly developed septum at A."http://history.nasa.gov/SP-362/ch7.2.htm |
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Mar 30 2010, 06:17 PM
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#174
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Senior Member Group: Moderator Posts: 4160 Joined: 19-April 05 From: .br at .es Member No.: 253 |
QUOTE (Phil Stooke @ Mar 30 2010, 05:28 PM) Don't worry, people - soon the wretched feature will be far behind us. Actually, it already is by a few meters, because Opportunity is now positioned at the east crater. Pictures should be available soon. |
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Mar 30 2010, 07:10 PM
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#175
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Senior Member Group: Members Posts: 2253 Joined: 30-October 04 Member No.: 105 |
Sounds like a good plan. The ejecta is eroded, the rock in the southwall is not in-situ bedrock but exhumed ejecta. Nothing to see, move along folks. We'll get the images downlinked. Eventually.
However, just for curiosity, it would be nice to have a Pancam set of the mysterious prancha de grupo between the craters... --Bill -------------------- |
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Mar 30 2010, 07:52 PM
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#176
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 Senior Member Group: Members Posts: 2736 Joined: 17-January 05 Member No.: 152 |
I have to say this is one of the prettiest craters we've visited - here's east twin:
http://qt.exploratorium.edu/mars/opportuni...I4P1977R0M1.JPG Drive direction pancams are looking SE, but could this be a reason to linger: is that a piece of impactor just inside the near rim? http://qt.exploratorium.edu/mars/opportuni...I4P1977R0M1.JPG Also notice the big, tall pile of ejecta at the far end of the isthmus/septum/gangplank. |
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Mar 30 2010, 08:04 PM
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#177
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 Senior Member Group: Members Posts: 2929 Joined: 4-November 05 From: North Wales Member No.: 542 |
A really fine set of images from a much more satisfying vantage point than the previous stop: should make a spectacular panorama (as Stu prophesied). Definitely one for the full treatment and a place on the wall. The septum will be immortalised - septum in saeculo saeculorum!
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Mar 30 2010, 08:49 PM
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#178
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 Junior Member Group: Members Posts: 39 Joined: 19-August 09 From: Dallas Member No.: 4905 |
QUOTE (fredk @ Mar 30 2010, 01:52 PM) I have to say this is one of the prettiest craters we've visited[...] There is a look at Eastern Twin with tracks leading to previous vintage point by Western Twin  |
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Mar 30 2010, 09:47 PM
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#179
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The Poet Dude Group: Moderator Posts: 5546 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Not a bad view after all...
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Mar 30 2010, 09:51 PM
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#180
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The Poet Dude Group: Moderator Posts: 5546 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
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