Juno perijove 5, March 27, 2017 |
Juno perijove 5, March 27, 2017 |
Mar 16 2017, 10:24 PM
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Juno's perijove 5 is coming up less than two weeks from now - it's on March 27, 2017.
The target selection voting has started and is open until almost four days from now: https://www.missionjuno.swri.edu/junocam/voting?current A large part of the data volume will be reserved for polar time lapse sequences though. John Rogers has written a helpful summary of the upcoming perijove 5: https://www.britastro.org/node/9377 |
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May 20 2017, 02:07 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Youtube upload of Perijove-05 animation completed.
Youtube refused my AVI version; so I needed to upload a terribly large 500 MB+ MOV file. However, quality may have suffered a bit in the youtube version. The bluish-green can be of at least two reasons: - Jupiter's haze appears to be bluish, especially when seen from acute angles, and near the poles. - Some portions of some of the images are saturated in the red filter band, resulting in a cast to the complementary color, i.e. greenish-bluish. This risk has been taken, in order to obtain better S/N. |
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May 21 2017, 04:59 PM
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Senior Member Group: Members Posts: 1648 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
The bluish-green can be of at least two reasons: - Jupiter's haze appears to be bluish, especially when seen from acute angles, and near the poles. - Some portions of some of the images are saturated in the red filter band, resulting in a cast to the complementary color, i.e. greenish-bluish. This risk has been taken, in order to obtain better S/N. I recall some discussion about a greenish cast showing up in the Earth flyby images. Perhaps the red band was saturated there also? Unsure if the haze would have been a factor in this case. Would be interesting to model the expected color of Jupiter's haze and clouds with a scattering code. Maybe this would be kind of drastic, though I wonder if reducing the color saturation in areas where the red is saturated on the bright end would help? Would this help get a better color balance in low intensity areas? Perhaps this is the S/N tradeoff being mentioned. Indeed the bright clouds should be a good white reference, at least near the nadir if the sun is reasonably high up. It is a challenge to maintain a good color balance with strong contrast enhancement, so perhaps a version with less contrast and more accurate hues would be interesting as well. -------------------- Steve [ my home page and planetary maps page ]
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