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: 2254 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 22 2017, 06:31 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
For the animation and PJ06 images, I didn't use a documented illumination model, but rougly speaking, it's somewhere between the Lambert and Lommel-Seeliger models. It's a function of incidence and emission angle with some intentional remaining illumination effect for better 3D appearance. It's derived from an averaged brightenss map as a function of incidence and emission angles, and some fine tuning on the basis of PJ05 images.
Thus far, I didn't yet model the dependency of the function from light wavelength. But I've implemented the infrastructure to do so in the near future. This lack of color adjustment to emission angles leads to a bluish cast in much of the animation, since most of the close-up sequence is derived from portions of the original images with acute emission angles, and without adjusting e.g. for Rayleigh scattering. I'm intending to do this in an automated way as soon as analysis and implementation are completed. I think, that it will take another several weeks, so it won't yet be applied to the first version of PJ06 animation, at least not yet fully. I'm expecting spectral effects of scattering being dependent on local atmospheric properties, and I'll try to take this into acount, where sufficient data is available. For animations with up to several thousands of frames, I don't even try to do this manually, but work immediatly towards an automated solution, despite taking a little longer for the first results. |
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