Rev 167 - May 28-June 17, 2012 - Titan T84 and Mimas, Also propellers |
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Rev 167 - May 28-June 17, 2012 - Titan T84 and Mimas, Also propellers |
 May 24 2012, 05:42 PM
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 Member  Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655  |
Latest article is up here
Good close Titan flyby, with more radar coverage and ISS observations, mid-range Mimas imaging, and a followup observation of 'propellers' in the A ring amongst other goodies. Notable that there seem to be astrometric observations from long-range of the smaller moons in the Saturnian system on every orbit - I wonder how constrained the orbital characteristics of these moons now are, and whether this campaign is planned for the rest of the mission? Jase |
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May 24 2012, 11:20 PM
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Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
Great!
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May 24 2012, 11:40 PM
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 IMG to PNG GOD Group: Moderator Posts: 2250 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
QUOTE (jasedm @ May 24 2012, 05:42 PM)  mid-range Mimas imaging In the context of Mimas this is actually a very close flyby - the second closest flyby of the entire mission so far if I remember correctly. And the terrain in view is relatively poorly imaged so this is going to be an interesting flyby. |
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May 24 2012, 11:58 PM
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#4
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
QUOTE (jasedm @ May 24 2012, 12:42 PM) Notable that there seem to be astrometric observations from long-range of the smaller moons in the Saturnian system on every orbit - I wonder how constrained the orbital characteristics of these moons now are, and whether this campaign is planned for the rest of the mission? There can be more interesting results, such as this one, which I noticed cited on wikipedia: http://arxiv.org/abs/astro-ph/0611590 ... but that's from a telescope. Perhaps they've found that it might be worthwhile to do it from Cassini. The discussion include speculation about a source for the Iapetus dark material not included in the conclusions, which have some other interesting tidbits. Repeat with Cassini, and perhaps learn a lot more than simply the orbit with better precision. |
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May 25 2012, 12:17 AM
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 Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Just because I can't get enough of this Mimas shape model, here is an animated gif of preview frames for the upcoming flyby:
http://pirlwww.lpl.arizona.edu/~perry/imag...mas_Preview.gif -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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May 25 2012, 05:33 AM
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#6
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Member Group: Members Posts: 540 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
Nice preview. So, going to fill in that bald spot, then? That should just about do it for Mimas.
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May 27 2012, 03:46 PM
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#7
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
QUOTE (Bjorn Jonsson @ May 25 2012, 12:40 AM) In the context of Mimas this is actually a very close flyby - the second closest flyby of the entire mission so far if I remember correctly. And the terrain in view is relatively poorly imaged so this is going to be an interesting flyby. Agreed - I think the mission planners contend that sub-10,000km is a 'close' flyby, but this one will be a good-gap-filler. We also have 3 flybys of Mimas closer than this upcoming one before mission-end to look forward to. 
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Jun 6 2012, 04:37 PM
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 Member Group: Members Posts: 159 Joined: 4-March 06 Member No.: 694 |
Some good news. The Mimas raw images are now available. They include some Saturn shine images too. It looks like that the entire North Polar area of Mimas will be imaged at high resolution here.
-------------------- I call heaven and earth to witness against you this day, that I have set before thee life and death, the blessing and the curse; therefore choose life, that thou mayest live, thou and thy seed.
- Opening line from episode 13 of "Cosmos" |
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Jun 6 2012, 08:53 PM
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 Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
False colour, two-footprint, NAC view of Mimas, made from CLEAR, GREEN and UV filtered frames:
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Jun 7 2012, 05:28 PM
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#10
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
Great work as always Ian - thanks. I refuse to become blase about the views we're getting every day from Saturn - fabulous stuff.
I noticed a strange landform in one of the craters near the terminator in the raws (see below). This view is cropped from image N00190674, and there seems to be a 'lump' there. Primary illumination is from the 'West' (although I've rotated the image for ease of viewing) Anybody any ideas what it might be? Jase
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Jun 7 2012, 06:24 PM
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 Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
It looks at first glance like material that has slumped out of the smaller tilted crater bisected by the upper edge of your white box, down into the bigger one. Just a guess!
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Jun 7 2012, 07:49 PM
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#12
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Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Do we have coverage of this area from another viewpoint and with a different illumination angle? I also think it looks like slumped material.
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Jun 7 2012, 07:50 PM
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#13
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 Member Group: Members Posts: 754 Joined: 9-February 07 Member No.: 1700 |
I have the same guess as ngunn. Could the 'slump' have been a result of the other impact?
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Jun 7 2012, 08:41 PM
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#14
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Looks like a slump from the mutual rim of Ban (the younger, sharper crater on the left in jasedm's image) and Bors (the older crater). Odd shape I have to admit.
Here is a view from Rev126. Bors and Ban are near the top. You should be able to easily pick out Ban and Bors is next to it to the left.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jun 8 2012, 12:08 PM
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#15
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
Thanks all.
Agreed, it looks like an ice-alanche, but with a big chunk of material having slumped down-gradient as opposed to solely loose 'rubble' Mimas' low gravity coupled with ice at -300 degrees fahrenheit will produce counter-intuitive results I suppose. Some pretty mangled topography in that area! |
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