The Big One, My latest (and last for a while!) mosaic... |
The Big One, My latest (and last for a while!) mosaic... |
Mar 5 2007, 04:04 PM
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#1
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
I started working on the following mosaic on the 22nd of February, and just over 10 days later, it is finally completed. At times it was an extremely frustrating process indeed; however, as each tile fitted together and more of the finished composite was revealed, I grew ever more excited.
Now it is with a big sigh of relief that I can finally reveal Saturn as she presented herself to Cassini on the evening of the 20th of February, 2007: I dedicate this image to all the great folks here on UMSF who have greatly enriched my enjoyment of space exploration. Enjoy! Ian. -------------------- |
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Dec 5 2007, 11:52 PM
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#2
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
I've reprocessed the colours in this mosaic in light of the official Photojournal release, which only covers the bottom-left corner of the entire view:
Unfortunately, it seems as if the centre tile is over-exposed to the point of saturation, although I haven't yet looked at the PDS release to see if that is indeed the case. Ian. -------------------- |
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Dec 6 2007, 09:56 AM
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#3
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Unfortunately, it seems as if the centre tile is over-exposed to the point of saturation, although I haven't yet looked at the PDS release to see if that is indeed the case. This data is not yet available on the PDS (scheduled for January 2008), but unfortunately all evidence points out to the actual raw data being overexposed as well. How they couldn't figure out a correct exposure for a low phase view of a well characterized target puzzles me (all the more because gaseous objects don't tend to display great brightness variations vs. phase angle). The same issue was present in the very first huge Saturn mosaic, it was only the second big one which got the exposures right (The Greatest Saturn Portrait... Yet). It's a shame because this particular view shows a vantage point pretty similar to what can be observed from Earth and it would make for a nice comparison to those cool Hubble views. -------------------- |
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Dec 6 2007, 12:26 PM
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#4
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Great work with the data available! It is surprising that it is so overexposed....For the central disk, it is hard to think of a reason. I have my fingers crossed that it is another quirk of the "raws," and that the overexposure is not real.
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Dec 6 2007, 12:52 PM
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#5
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I have my fingers crossed that it is another quirk of the "raws," and that the overexposure is not real. The fact CICLOPS only released the bottom portion of the mosaic as Ian said suggests otherwise, unfortunately. It should be noted that a few filters are not overexposed, but IIRC they are in the infrared region. -------------------- |
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