Rev 201 and T98, Looking for changes in Ontario Lacus |
Rev 201 and T98, Looking for changes in Ontario Lacus |
Jan 30 2014, 03:18 AM
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#1
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Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
T98 flyby description is up http://saturn.jpl.nasa.gov/mission/flybys/titan20140202/ . This occurs during rev 201 http://www.ciclops.org/view/7796/Rev201?js=1 and features radar views of Ontario Lacus.
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Feb 1 2014, 05:21 AM
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#2
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Newbie Group: Members Posts: 17 Joined: 30-November 12 From: Washington, DC Member No.: 6773 |
Pretty excited for this flyby!
I just put together these two views of Titan, from January 26th: Above and Below Titan's Atmosphere #6 -------------------- Val Klavans
Co-Producer of In Saturn's Rings | Space Image Processor | Astronomy Communicator | Guitarist |
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Feb 1 2014, 12:37 PM
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#3
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
And here's my own rendering of the three CB3 frames:
Thanks to the wonders of Celestia, I was able to animate the flyby, and point out some of the primary science objectives: http://www.youtube.com/watch?v=1i1obyesxFs -------------------- |
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Feb 2 2014, 02:03 AM
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#4
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
for any that do not know
there is a celestia SPICE thread for Cassini over here http://forum.celestialmatters.org/viewtopi...?f=18&t=590 it is an ongoing update , right now it is through feb7 ( the default celestia cassini mesh is mis rotated by x=90 deg ) |
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Feb 4 2014, 12:31 PM
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#5
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Member Group: Members Posts: 238 Joined: 15-January 13 Member No.: 6842 |
A snapshot during the approach to Titan, Feb 1st 2014. Filters used in this RGB composite: CB3 (red) and MT1 (blue) with synthetic green channel. Second image is in visible light.
I wonder is the methane spectrum absorbtion (shown as reddish part of the atmosphere) at the pole is due to methane evaporating from the surface lakes? -------------------- Curiosity rover panoramas: http://www.facebook.com/CuriosityRoverPanoramas
My Photosynth panoramas: http://photosynth.net/userprofilepage.aspx...;content=Synths |
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Feb 4 2014, 04:46 PM
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#6
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
This is a rather crude, but reasonably effective attempt at coaxing out detail in the northernmost latitudes, especially just south of the bright evaporite deposits:
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Feb 4 2014, 10:19 PM
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#7
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Member Group: Members Posts: 315 Joined: 1-October 06 Member No.: 1206 |
Dumb question: does the south have a bright polar cap like this (I dont remember seeing such a clear ISS image of the south) and if so does it have the same relationship to lake basins full or otherwise?
Actually can anyone direct me a a map of putative southern lake basins? I dont mean Ontario, I mean the ones that a currently dry. P |
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Feb 4 2014, 10:34 PM
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#8
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
A quick google search turned up this:
http://www.google.co.uk/url?sa=i&rct=j...391639165393287 The brighter area is closer to the pole than the one big southern lake, Ontario. EDIT : I think there is a map of putative southern paleolake basins somewhere in the latest 2014 LPSC abstracts. Sorry not to be more help - it's late. |
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Feb 5 2014, 05:11 AM
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#9
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Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
Recent topographic maps of Titan's polar regions highlight the now dry south polar basins. http://www.jhuapl.edu/newscenter/pressrele...0515_image3.asp
The topic was discussed a bit in this forum as well. http://www.unmannedspaceflight.com/index.php?showtopic=6142 |
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Feb 5 2014, 06:37 AM
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#10
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
EDIT : I think there is a map of putative southern paleolake basins somewhere in the latest 2014 LPSC abstracts. It's figure 1 in the first abstract in the 'Titan Lakes' session. The Palaeobasins are coloured purple. Here again is the link that machi posted: http://www.hou.usra.edu/meetings/lpsc2014/...Abstracts/view/ |
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Feb 5 2014, 12:06 PM
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#11
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Member Group: Members Posts: 315 Joined: 1-October 06 Member No.: 1206 |
Thanks everyone - very interesting - the 2014 LPSC abstracts will keep me busy for ages!
Wow - tentative detection of waves on Punga Mare! http://www.hou.usra.edu/meetings/lpsc2014/pdf/1947.pdf Double wow - putative tidal races in the 'throat of Kraken' http://www.hou.usra.edu/meetings/lpsc2014/pdf/1476.pdf Have there been any southern lakes other than Ontario formally named? p |
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Feb 5 2014, 05:38 PM
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#12
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Note also this one:
Hofgartner J. D. * Hayes A. G. Lunine J. I. Zebker H. Stiles B. et al. The Case of Titan’s Mysterious New Island: Analysis of Anomalously Bright Features Observed in the Cassini T92 SAR Pass Over Titan’s Ligeia Mare [#1841] Anomalous features were detected in Ligeia Mare that were not in any preceding nor subsequent observations. They are unique on Titan or transient in nature. I note that this feature appeared in SAR with illumination angle 6 degrees off nadir - exactly the same distance from the specular point as for the VIMS putative waves observation. There is no mention that they might have the same explanation, however, even though the two abstracts have authors in common. I couldn't follow the discussion on quasi-specular reflection well enough to know if they ruled out localised 6 degree waves for the SAR observation. |
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Feb 6 2014, 01:40 AM
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#13
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Member Group: Members Posts: 315 Joined: 1-October 06 Member No.: 1206 |
Ok, having now read Dr. Lorenz's paper, and knowing that he contributes here, I'd like to ask a few questions!
Figure 2 of the paper, the blowup of the 'throat' area between the two Kraken basins not only shows the throat, but on the promontory to its west, what looks like multiple islands separated by narrow channels all the way to the 'mainland'. Surely these constrictions have the potential to generate even bigger tidal races? Also - has the 'mare' on the equatorside of the southern Kraken basin been named? P |
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Feb 6 2014, 08:45 AM
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#14
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
I may be wrong but in general I doubt that authors will be willing to discuss their work here before presenting at the conference. After that though let's hope they do.
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Feb 6 2014, 02:50 PM
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#15
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Talking about an active area of research is a double-edged sword. On the positive side, it's always fun to openly discuss work and learn ways to improve and collaborate. On the other hand, you are tipping your hand early and opening up to other groups "scooping" your work. (Yes, even in here, that stuff happens.)
That being, said, the story of the "Mystery Island" is going to be very interesting to follow. (full disclosure, I am in the author list). Jason is doing a very careful, thorough, and collaborative analysis on an interesting observation. This will be a good story on not only the results, but also the process of discovery and analysis. Here is the link to the abstract: Hofgartner et al., LPSC 2014, Abstract 1841: http://www.hou.usra.edu/meetings/lpsc2014/pdf/1841.pdf -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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