Rev 149 - May 30-Jun 29, 2011 - Helene, Distant Iapetus, mutual events |
Rev 149 - May 30-Jun 29, 2011 - Helene, Distant Iapetus, mutual events |
Jun 21 2011, 11:30 AM
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#61
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
"Anyone know if VIMS also got images?"
It's highly probable. VIMS worked together with ISS almost every close flyby . This was for example case of last Helene flyby and results has similarly bad alignment. -------------------- |
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Jun 21 2011, 01:10 PM
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#62
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Junior Member Group: Members Posts: 76 Joined: 19-October 05 Member No.: 532 |
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Jun 21 2011, 01:32 PM
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#63
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
Anyone else reminded of Clarke's novel, A Fall of Moondust ?
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Jun 22 2011, 02:38 PM
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#64
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Junior Member Group: Members Posts: 33 Joined: 25-March 10 Member No.: 5281 |
Eyes on the Solar System has predicted trajectory (but not pointing) for this - and looking at the geometry, I think it's the limb of Saturn, The 'darkness' you have, is the night side of Saturn. C/A was well after that and the dark side of Saturn was no longer in the FOV. Yes, the bright patch definitely is the Saturnian limb. Coincidentally, the limb is right at the terminator too. |
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Jun 22 2011, 03:06 PM
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#65
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
-------------------- |
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Jun 22 2011, 03:42 PM
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#66
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Member Group: Members Posts: 399 Joined: 28-August 07 From: San Francisco Member No.: 3511 |
High praise for that high phase... WOW !
-------------------- 'She drove until the wheels fell off...'
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Jun 22 2011, 04:45 PM
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#67
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
Stanley Kubrick would be envious.
-------------------- If Occam had heard my theory, things would be very different now.
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Jun 22 2011, 05:53 PM
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#68
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
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Jun 27 2011, 01:24 AM
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#69
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
The distant view from January essentially shows the same side of Helene, albeit illuminated from the opposite angle:
http://photojournal.jpl.nasa.gov/catalog/PIA12758 Now, the caption states that this is the trailing hemisphere, which I *think* is a mistake; the 'Eyes on the Solar System' simulation and the mini-atlas suggest that this is actually the leading hemisphere. Here are two shots from the January and June flybys side-by-side: ...and here is a rough version of the two combined, showing the entirety of the leading hemisphere: -------------------- |
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Jun 27 2011, 09:24 AM
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#70
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Fantastic finding!
From this angle Helene looks like heart, what it is not very surprising, when one come to realize, that Helen was beautiful Troy's princess. -------------------- |
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Jun 27 2011, 06:14 PM
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#71
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
...and here is a rough version of the two combined, showing the entirety of the leading hemisphere: Great finding, I made another version with different hue illuminations (some distorsion in the polar regions of older image was necessary in order do better match features, probably due to slight difference in the Cassini "latitude"): What an incredible body! -------------------- I always think before posting! - Marco -
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Jun 27 2011, 06:29 PM
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#72
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Solar System Cartographer Group: Members Posts: 10153 Joined: 5-April 05 From: Canada Member No.: 227 |
Very nice, Dilo!
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 PD: 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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Jul 1 2011, 03:58 PM
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#73
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
I concur with Phil: Dilo, that was a really good idea to colourise the two halves in different hues; both informative and eye-catching!
Phil, as an expert in small heavenly bodies, do you agree that this is indeed the leading hemisphere of Helene? -------------------- |
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Jul 3 2011, 05:39 PM
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#74
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Junior Member Group: Members Posts: 22 Joined: 6-March 10 From: London, Ontario, CANADA Member No.: 5247 |
Great finding, I made another version with different hue illuminations (some distorsion in the polar regions of older image was necessary in order do better match features, probably due to slight difference in the Cassini "latitude") Beautiful composite! Note that the darker surface that appears to be eroding into the lighter gullies has some relief: The darker surface is exposed mostly in the ridges and appears competent -relative to the gullies it has been around for awhile. Perhaps this implies that if the leading surface of Helene is being coated, it is not a continuous process but is instead episodic. If a `weathering' rate could be determined then a limit on the age of the last `coating' event could be estimated. -pjam -------------------- "We absolutely must leave room for doubt or there is no progress and there is no learning." -Richard P. Feynman
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Jul 4 2011, 10:16 AM
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#75
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
This flyby made me go back and take another look at the images Cassini took from last year's encounter. I decided to stack the Saturn-shine pictures, resulting in a reasonable enhancement of the facing hemisphere:
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