Rev 138 - Sep 13-Oct 4, 2010 - Titan T72 |
Rev 138 - Sep 13-Oct 4, 2010 - Titan T72 |
Sep 15 2010, 06:29 PM
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#1
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Senior Member Group: Members Posts: 1426 Joined: 26-July 08 Member No.: 4270 |
A nice shot of Janus.
http://saturn.jpl.nasa.gov/multimedia/imag...3/N00163151.jpg Some more (severe) data drop outs v_v. http://saturn.jpl.nasa.gov/multimedia/imag...2/N00163150.jpg -------------------- -- Hungry4info (Sirius_Alpha)
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Sep 15 2010, 06:37 PM
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#2
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Unlike MER, Cassini doesn't release raw images if their first transmission had data gaps; JPL holds back release of any Cassini images with data dropouts, in the hopes that Cassini will be able to retransmit the data. Once in a while, Cassini empties its data recorders (usually but not always in preparation for a targeted flyby) and then JPL has to give up on getting better versions of the images, with the result that you'll suddenly see a big batch of images with data dropouts and old dates hit the raw images website.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Sep 16 2010, 06:29 PM
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#3
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Newbie Group: Members Posts: 17 Joined: 4-March 10 Member No.: 5240 |
Cassini empties the recorders every few days, and almost never retransmits data. Retransmission is a planned, automatically-play-back-twice practice that's reserved for Titan and icy satellite encounters. You're probably seeing the difference between data the DSN sends to JPL immediately, and the "bested" data. There is some level of error correcting that the DSN can do, to recover packets corrupted in transmission, which they can't do on the fly. That is usually available a few days after the bits hit the ground. The really ratty data is probably from downlinks where the conditions were so bad that no amount of reprocessing and error correction can help.
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Sep 18 2010, 03:37 AM
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#4
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Newbie Group: Members Posts: 19 Joined: 17-June 09 Member No.: 4825 |
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Sep 18 2010, 04:22 AM
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#5
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Sep 18 2010, 10:44 AM
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#6
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
But I would just like to ask, is there be a version with less .jpg compression? Those artifacts are in the raw jpegs, not caused by output compression setting so no. -------------------- |
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Sep 18 2010, 11:59 AM
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#7
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Newbie Group: Members Posts: 19 Joined: 17-June 09 Member No.: 4825 |
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Sep 18 2010, 01:00 PM
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#8
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Solar System Cartographer Group: Members Posts: 10157 Joined: 5-April 05 From: Canada Member No.: 227 |
But wait six months and you'll have the 'real' raws with no compression!
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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Sep 18 2010, 01:41 PM
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#9
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
For this particular observation that works out to 10 months.
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Sep 18 2010, 08:48 PM
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#10
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
for the image "dione_20100903.jpg"
"But I would just like to ask, is there be a version with less .jpg compression?" they are not all that bad , i have seen far,far worse in some of the celestia add on's ( some so bad i want to reject them ) but if you want here is a copy that i removed most from (as always, there is always a trade off with sharpness so...) |
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Oct 9 2010, 04:15 PM
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#11
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Member Group: Members Posts: 910 Joined: 4-September 06 From: Boston Member No.: 1102 |
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Oct 10 2010, 08:05 AM
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#12
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
I'm reckoning (without checking any simulators) that there are 6, and anticlockwise from bottom left they are:
Epimetheus, Daphnis, Pan, Janus, Enceladus and Atlas Couldn't spy any more..... |
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Oct 22 2010, 05:44 PM
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#13
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
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