Cassini "Kodak Moments" |
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Cassini "Kodak Moments" |
 Dec 3 2008, 02:58 PM
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#106
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Senior Member  Group: Members Posts: 1101 Joined: 14-October 05 From: Seattle Member No.: 530  |
Is Cassini on the right side of things? Checked Emily's tour page and it looked like it passed Titan just before this period, and hit periapsis just afterward. So I guess that narrows my question down to... is Titan on the night side of Saturn?
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Dec 3 2008, 05:57 PM
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#107
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Senior Member Group: Members Posts: 4514 Joined: 5-April 05 From: Canada Member No.: 227 |
At some point we'll see ring shadows on Titan as well, not to mention on all the other moons. In fact it's going to be a complete shadow-fest around the equinox.
Phil -------------------- ... because the Solar System ain't gonna map itself.
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Dec 3 2008, 08:15 PM
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#108
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 Member Group: Members Posts: 135 Joined: 23-August 06 From: Vriezenveen, Netherlands Member No.: 1067 |
QUOTE (volcanopele @ Dec 3 2008, 12:49 AM)  The only problem is that none of these eclipses are total. They are better described as transits rather than eclipses, as each of these moons are smaller than the sun from Titan's perspective. I never called the transits of the shadows of Saturn's satellites on Titan eclipses  When Dione is in Titan's shadow, that will be a full eclipse. |
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Dec 20 2008, 02:30 AM
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#109
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Junior Member Group: Members Posts: 35 Joined: 28-September 05 From: Seattle, WA Member No.: 514 |
QUOTE (CAP-Team @ Dec 2 2008, 01:39 PM) 25 and 26 july 2009 will be very exciting, on those days, the shadows of several of Saturn's satellites will cast their shadow on Titan! 1. Dione: 25 july 2009 13:21 UT 2. Tethys: 25 july 2009 13:40 UT (partial) ... On 3 August, Dione will be in Titan's shadow (full eclipse) [attachment=16684:titaneclipse.jpg] Here's a comprehensive table of mutual events of the Saturnian satellites during the 2009 equinox: ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/485/293/tab4-7.dat (I haven't checked it to see if there are any overlapping events that produce two shadows on a single satellite--seems possible, but unlikely.) I've produced a patch for Celestia that depicts eclipse (and transit  ) shadows more realistically. Due to a bug in the current Celestia release, the shadow in your attached image is much too dark. It should look more like this:
The patch accurately calculates the maximum depth of the shadow and its umbra/antumbra size. There's more about it in this thread on the Celestia forum: http://www.shatters.net/forum/viewtopic.php?f=10&t=13323 As fun as it is to mess with this stuff on a computer, I'm really hoping that Cassini will be able to get some real images of some of these events. --Chris |
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Dec 23 2008, 08:32 AM
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#110
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 Member Group: Members Posts: 521 Joined: 20-April 05 From: Poland Member No.: 299 |
-------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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Dec 23 2008, 09:31 AM
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#111
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 Senior Member Group: Members Posts: 3534 Joined: 1-October 05 From: Croatia Member No.: 523 |
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Jan 10 2009, 09:12 AM
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#112
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 Senior Member Group: Moderator Posts: 2817 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I have to admit, this image is pretty cool:
http://saturn.jpl.nasa.gov/multimedia/imag...6/N00127583.jpg The shadow of Epimetheus on the outer A ring. Acquired Jan. 8. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jan 10 2009, 01:25 PM
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#113
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 Senior Member Group: Members Posts: 2248 Joined: 15-January 05 From: center Italy Member No.: 150 |
QUOTE (volcanopele @ Jan 10 2009, 10:12 AM) The shadow of Epimetheus on the outer A ring. Acquired Jan. 8.   -------------------- - Marco -
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May 12 2011, 03:11 PM
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#114
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Senior Member Group: Members Posts: 2248 Joined: 15-January 05 From: center Italy Member No.: 150 |
Sorry for using an old thread, I think today's APOD picture is worth a colorized version:
-------------------- - Marco -
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May 12 2011, 04:29 PM
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#115
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Senior Member Group: Members Posts: 3534 Joined: 1-October 05 From: Croatia Member No.: 523 |
See also my version posted earlier, based on a low res Saturn crescent composite.
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Lo-Fi Version | Time is now: 22nd May 2013 - 05:08 AM |
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