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Juno Perijove 51, May 16, 2023
Bjorn Jonsson
post May 18 2023, 11:08 PM
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QUOTE (Kevin Gill @ May 18 2023, 06:19 PM) *
That then makes me wonder if it's simply that a peak is poking up into the sunlight from beyond the day/night terminator.

That's what's happening. There are some nice examples of this in the Galileo images, for example these:

https://photojournal.jpl.nasa.gov/catalog/PIA00738
https://photojournal.jpl.nasa.gov/catalog/PIA01107
https://photojournal.jpl.nasa.gov/catalog/PIA01103
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volcanopele
post May 18 2023, 11:45 PM
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Attached Image


Here is the full set of 8 images. Pele is still there as a plume deposit. It keeps being on the limb so it's hard to say if it is fading or if it is just the difference in filters. Still the most prominent surface changes are at Volund, East Girru, and Chors Patera. The triangular patch mentioned in the caption for the images released last week is now seems to be mountains that are surrounded by a "moat" of SO2 frost. Or at least a pair of mountains. Not entirely sure about the northeastern of the three patches.


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john_s
post May 19 2023, 02:03 PM
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Great pictures- thanks, Jason. Those frost halos around mountains seem to be a feature of Io's poles- Voyager 1 saw the same thing at Haemus Mons near the south pole. I still don't think there's a good explanation for them.

John
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Antdoghalo
post May 19 2023, 05:14 PM
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The frost halos seem to be all over Io. What is polar specific are the plains covered in scarlet material which make the tan frost halos more prominent there. A possible mechanism may be landslides of lighter material on the mountains depositing it around them.


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Decepticon
post May 22 2023, 11:10 PM
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https://www.space.com/nasa-juno-jupiter-io-...nic-moon-images
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Bjorn Jonsson
post May 24 2023, 12:32 AM
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An 8 image montage together with computer generated images with a latitude/longitude grid. The computer generated images are based on a Voyager/Galileo map of Io. Mountains (or hints of mountains) are visible near the terminator in some of the images, for example in images 62, 63 and 69.

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Brian Swift
post Jun 3 2023, 04:28 AM
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My take on Io images. North up. Natural-ish and exaggerated color/contrast.
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Full Rez PNG at https://www.missionjuno.swri.edu/junocam/processing?id=15180
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Candy Hansen
post Aug 25 2023, 07:08 PM
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We have posted PDS formatted images of PJ51 Io on the missionjuno Think Tank page. Scroll to the bottom of the Tools of the Trade tab.
Note that these images are only intended for expert ISIS users that know how to navigate around spice kernels. Use only reconstructed kernels.
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volcanopele
post Aug 25 2023, 08:10 PM
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ooo, and these include the RDRs. Thanks, Candy! I'll take a look at these over the weekend. I suspect that my old control point network won't work due to differences in serial numbers in ISIS but I do want to see if photomet applies more accurately with these RDRs.


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volcanopele
post Feb 14 2024, 04:55 PM
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JIRAM M-band composites from two of the sequences. JIRAM stared at Io for several hours during PJ51 so the difference in geometry makes it hard to make a single composite so I'm processing these one sequence at a time. I'm also only going to bother with the 2 ms data, not the 4 ms stuff. Yes, the 4 ms data has better SNR but I can avoid much of the smear with the 2 ms stuff and I have to constrain what I'm working on somehow. Any mismatches you see are due to the fact that I started using my crude (but reasonably well controlled) Io control network with this data set and the background map is still the USGS basemap.

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Attached Image


I see past me's comment about serial numbers and this will likely lead me to edit the RDR labels during ingestion on my end so that I can still use my control point network on them because there is NO WAY I am redo'ing all this work...


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