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T16 (July 22, 2006) |
 Jul 10 2006, 12:26 AM
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 Senior Member  Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110  |
Cassini will leave the ring plane on this orbit. It will be nice to see the rings again.
The view from Solar System Simulator on July 24 http://space.jpl.nasa.gov/cgi-bin/wspace?t...=1&showsc=1 |
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| Guest_AlexBlackwell_* |
Jul 14 2006, 11:09 PM
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Guests |
The T16 Mission Description document is now online (1.2 Mb PDF).
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| Guest_AlexBlackwell_* |
Jul 17 2006, 08:56 PM
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The T16 flyby page is now online.
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Jul 18 2006, 12:49 AM
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 Junior Member Group: Members Posts: 98 Joined: 29-July 05 From: Amsterdam, NL Member No.: 448 |
This T16 flyby is scheduled to have an altitude of only 950km, which is markedly lower than previous ones. In the past, the Cassini team has been reluctant to perform such a low pass due to fears of friction and drag from Titan’s enormous atmosphere. I haven't been following the "Significant Event Reports" page on the Cassini website lately--are they no longer concerned with these possible effects?
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| Guest_AlexBlackwell_* |
Jul 18 2006, 12:59 AM
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#5
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QUOTE (NMRguy @ Jul 17 2006, 02:49 PM)  This T16 flyby is scheduled to have an altitude of only 950km, which is markedly lower than previous ones. In the past, the Cassini team has been reluctant to perform such a low pass due to fears of friction and drag from Titan’s enormous atmosphere. I haven't been following the "Significant Event Reports" page on the Cassini website lately--are they no longer concerned with these possible effects? There will always be a little apprehension at the lower altitudes but, among other things, T16 is a near-polar pass, which mitigates the risk somewhat. There was some discussion of this in another thread ("Cassini Tour Tweaks - Titan >950 Km"). |
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| Guest_Sunspot_* |
Jul 23 2006, 12:01 PM
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#6
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Pictures are up......
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Jul 23 2006, 04:07 PM
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 Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
ummmm...not good...
http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=79647  We are also a bit into unchartered territory here. This is our first Titan flyby with the illuminated view visible after the flyby. This was just the first of the two Titan-dedicated downlinks so hopefully the rest of our outbound mosaic will be returned, but as I noted above, the over-exposure of the mt1 frames is a tad worrisome... Also, since we are seeing our outbound frames, this does bode well for RADAR, so hopefully they got their data. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jul 23 2006, 05:16 PM
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Founder Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Almost certainly just crap processing of the JPG's before going on line. Jason will be able to give us more details ( maybe ) but they're likely to be able to pull something out of that lot.
Doug |
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Jul 23 2006, 05:26 PM
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#9
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
QUOTE (volcanopele @ Jul 23 2006, 10:07 AM) ummmm...not good... http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=79647 We are also a bit into unchartered territory here. This is our first Titan flyby with the illuminated view visible after the flyby. This was just the first of the two Titan-dedicated downlinks so hopefully the rest of our outbound mosaic will be returned, but as I noted above, the over-exposure of the mt1 frames is a tad worrisome... Also, since we are seeing our outbound frames, this does bode well for RADAR, so hopefully they got their data. Yes, there should be good radar, and it may explain some of this imaging. The closest image I could find was ~26,000 km, and the first release jumps from ~30km to over 100,00km. There were some scheduled gaps, and the Cassini Event log said that the data was being transmitted on a priority bases. |
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Jul 23 2006, 05:57 PM
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 Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
QUOTE (djellison @ Jul 23 2006, 06:16 PM) Almost certainly just crap processing of the JPG's before going on line. I'm not so sure about that... There are images that have a rather large dynamic range clipped off, some are plain overexposed like come CB3 filtered frames and some are just wasted like this one. Notice it's not white so it's not due to the raw histogram stretching. You think that after 16 flybys they'd nail Titan's brightness through various filters vs. phase angles. -------------------- |
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Jul 24 2006, 02:45 AM
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 Member Group: Members Posts: 345 Joined: 2-May 05 Member No.: 372 |
QUOTE (djellison @ Jul 23 2006, 01:16 PM) Almost certainly just crap processing of the JPG's before going on line. Jason will be able to give us more details ( maybe ) but they're likely to be able to pull something out of that lot. Doug Tired, Doug? You seem to be replying to Jason. 
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Jul 24 2006, 03:00 AM
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Solar System Cartographer Group: Members Posts: 10265 Joined: 5-April 05 From: Canada Member No.: 227 |
Well, a bit of a mosaic (so far?)
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 PDF: 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 24 2006, 04:35 AM
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#13
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Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Well, as you can see from the images Phil put together, we got some of the images right, in fact we got most just fine. But some of the images are over-exposed (meaning it isn't just a problem with the histogram stretching). Regardless, since some of the images look okay, perhaps I can do something with them.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jul 24 2006, 11:36 AM
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#14
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
"ummmm...not good..."
Um... I think those pictures (which are only selected pics in the sequences) are intentionally overexposed so as to get good signal-to-noise in the near-terminator regions. |
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Jul 24 2006, 12:02 PM
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#15
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Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
QUOTE (edstrick @ Jul 24 2006, 12:36 PM) I think those pictures (which are only selected pics in the sequences) are intentionally overexposed so as to get good signal-to-noise in the near-terminator regions. That sounds plausible. Though, looking at the raws themselves - it only turned out useful at the upper half of the images, not that much territory. Contrast is bound to be very low anyway due to the low sun elevation there.I'm looking forward to RADAR guys releasing bits of the newest swath. Hopefully some interesting stuff will 'crop up' 
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