Juno perijove 6, May 19, 2017 |
Juno perijove 6, May 19, 2017 |
May 4 2017, 05:57 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Voting for Perijove 06 started yesterday, and it will last for another almost 7 days.
This time, I'm not quite free of bias, since I'm interested in an extension of the polar time-lapse sequence, especially in a coverage of the north and south polar FFRs and the presumed edge of the respective polar haze disks. I think - well, I'm rather certain - that it's possible to infer short-time dynamics of the FFRs, and of the vortices near the edge of the haze disk. Due to the expected good contact to Earth during the PJ-6 pass we have a good chance to obtain overlapping images of these regions. More in the discussion section on the missionjuno site. Of course, there are other interesting targets, too; see Glenn's and John Rogers' (Philosophia-47) comments. A full latitude coverage would allow for a pole-to-pole animation. |
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Jun 9 2017, 11:39 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
I thought, I should post this rendition of PJ06#92 with the large tangential shadow:
I've used the "pinkish" color weights with 0.88 / 1.0 for red/green. I've rendered the image in one step directly from the raw with 60 pixels/deg, including reprojection, hence supersampled by a factor of about 2, all intermediate calculations in double precision floating point in order to avoid numerical truncation artifacts, and without intermediate image representations to minimize loss of data. The processing uses SPICE trajectory data in several reference frames, and assumes a Jupiter MacLaurin spheroid rotating with system-III angular velocity. Reprojection is to spherical coordinates at image stop time, with Juno's spin axis as approximate axis of the spherical coordinate sytem. This version tries to adjust illumination including the terminator, despite the poor S/N for this almost dark zone, in order to see the shadow of the moon as far as it can reasonably be persued. I didn't apply any sharpening nor other post-processing, except rotating by 180 degrees to have north up. Camera artifacts aren't patched in this version. The image is an excerpt of the products of one of 4 jobs I'm currently running in parallel on PJ06 data. I'm expecting to be able to upload the results of two of the jobs tomorrow, i.e. 2-fold supersampled versions of the PJ06-images (still with camera artifacts), terminator slightly darkened, one version with 0.82/1.0, the other one with 0.88/1.0 for red/green weights. The images will cover several Approach and Departure images as well as RGB close-ups, provided my computer is willing to complete the according jobs. I agree with Björn, that there are some subtle processing artifacts in #111. However, most PJ06 images appear to be less compressed than we've seen sometimes before. |
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