Juno perijove 28, July 25, 2020 |
Juno perijove 28, July 25, 2020 |
Jul 29 2020, 12:48 AM
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#1
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IMG to PNG GOD Group: Moderator Posts: 2250 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
The images from perijove 28 are now available. This is image PJ28_24 in approximately true color/contrast and enhanced versions:
Image 28_24 was obtained shortly before Juno's perijove which makes it a very high resolution image. The resolution is highest (slightly better than 3 km/pixel) in the top center area in the 'central' image (the biggest image). At this high resolution some of the cloud features look rather fuzzy. |
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Jul 29 2020, 04:49 PM
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#2
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Member Group: Members Posts: 137 Joined: 22-July 14 Member No.: 7220 |
First attempts at maps and composites of PJ28 imagery:
Jupiter - PJ28-21 - Detail Jupiter - PJ28-21/22 - Detail Map Jupiter - Perijove 28 - Composite - 1 I've made some great strides improving my pipeline. I'm using some dark fields generated by Bjorn (Thanks!) and fixed a bug that compressed the images in an ugly way. Also, I'm getting good results integrating Denoise AI and Sharpen AI from Topaz Labs into my process. Not sure which one works the best yet, but both are really good. I'll continue uploading most of my intermediate files such as maps, meshes, Blender files, etc to my Google Drive: https://drive.google.com/drive/folders/1mWW...j_L?usp=sharing |
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Jul 29 2020, 09:46 PM
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#3
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IMG to PNG GOD Group: Moderator Posts: 2250 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
...Also, I'm getting good results integrating Denoise AI and Sharpen AI from Topaz Labs into my process. Not sure which one works the best yet, but both are really good. These have now become a 'standard' part of my processing pipeline as well, especially Denoise AI. Usually the results are great (much better than in e.g. Photoshop) but interestingly, I had difficulty getting results I was happy with from Denoise AI when processing image PJ28_24 (posted at the start of this thread). The problem seems to be that this image has a significant amount of relatively fuzzy cloud features plus some low contrast areas, especially where the resolution is highest near top center in the 'central' image in my post. I ended up not using Denoise for this particular image. |
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Jul 30 2020, 02:55 PM
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#4
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
My approach was to average the results from multiple upscalers/denoisers by masking and blending between them. It was labor intensive since the process had to be dialed in separately for each frame.
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Aug 2 2020, 08:24 AM
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#5
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Junior Member Group: Members Posts: 48 Joined: 9-August 19 Member No.: 8644 |
Our amazing Gerald Eichstädt has spotted some lightning on Jupiter!
https://www.missionjuno.swri.edu/junocam/processing?id=9054 |
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Aug 3 2020, 12:44 AM
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#6
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
Not a lot of detail there - can we be sure these aren't cosmic ray hits, eg?
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Aug 3 2020, 03:39 AM
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#7
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Senior Member Group: Members Posts: 2506 Joined: 13-September 05 Member No.: 497 |
Not a lot of detail there - can we be sure these aren't cosmic ray hits, eg? We can't be sure, but they're generally consistent with point sources (there are four pixels with values above background), whereas cosmics tend to either one pixel or many pixels in a line. See https://www.storm-t.iag.usp.br/pub/ACA0330/...leo-jupiter.pdf especially Figure 5. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Aug 3 2020, 04:33 AM
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#8
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
Yeah, PSF-like does suggest a real source.
Unless I've missed this somewhere, these were imaged on PJ28? So presumably day side? I recall the nightside Galileo observations, but are lightning strikes expected to be visible on the day side? |
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Aug 3 2020, 06:38 AM
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#9
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Senior Member Group: Members Posts: 2506 Joined: 13-September 05 Member No.: 497 |
Unless I've missed this somewhere, these were imaged on PJ28? So presumably day side? No, night side, during the high-TDI departure imaging. We've seen similar things in the northern hemisphere on earlier PJs, e.g., pj14-002. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Aug 4 2020, 01:31 AM
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#10
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
Thanks for the details. Any sense of whether these flashes are comparable in brightness to flashes seen by Galileo?
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Aug 4 2020, 05:37 PM
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#11
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Senior Member Group: Members Posts: 2506 Joined: 13-September 05 Member No.: 497 |
Any sense of whether these flashes are comparable in brightness to flashes seen by Galileo? It's fairly hard to say. Galileo was taking long time exposures (tens of seconds long, IIRC) and we are taking much shorter exposures with TDI where the flash presumably only lasts as long as one pixel residence time. I guess if you assumed the flash duration was similar one could back out the relative radiometry, but I haven't done that. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Aug 6 2020, 07:45 AM
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#12
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Member Group: Members Posts: 403 Joined: 18-September 17 Member No.: 8250 |
No, night side, during the high-TDI departure imaging. Has any consideration been given to capturing long exposures with TDI disabled (or intentionally mismatched to spin rate) to elongate or separate flashes? I see in the GALILEO LIGHTNING paper, they did some "scanned" frames. |
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Aug 6 2020, 03:10 PM
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#13
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Senior Member Group: Members Posts: 2506 Joined: 13-September 05 Member No.: 497 |
Has any consideration been given to capturing long exposures with TDI disabled (or intentionally mismatched to spin rate) to elongate or separate flashes? That's an interesting suggestion, we could look at that. Frankly, Junocam is not the best instrument on the spacecraft to be looking at lightning. We only take these images because the orbit geometry doesn't allow anything else and it's a way to keep the downlink full. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Aug 6 2020, 08:51 PM
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#14
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Member Group: Members Posts: 403 Joined: 18-September 17 Member No.: 8250 |
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Aug 7 2020, 12:44 PM
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#15
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Not a lot of detail there - can we be sure these aren't cosmic ray hits, eg? Maybe I should provide links to the maps the gif is derived from. Here the RGB maps. And here for a closer inspection selected green images for lightning search. Specifically, #87, and #90. There are only very few energetic particle hits in those images. And the lightning candidates are located at FFRs, where lightnings would be plausible or expected. So, besides the structure of the spots, the location hints towards lightning on a probabilistic basis. In the lower third of this site, you'll find less processed drafts to look for possible energetic particle hits and for stars to compare them with lightning candidates. |
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