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Juno Perijove 49, March 1, 2023
Brian Swift
post Apr 25 2023, 05:56 AM
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QUOTE (mcaplinger @ Apr 24 2023, 08:12 AM) *
I don't think it's necessary to call me out by name. Others may have answers and it just makes me feel bad if I can't respond.

Absolutely not my intention to make you feel bad. My wording was intentional. "Can you say...". A response of "I can't say" is perfectly reasonable and understandable if what I observed was some anomaly which you aren't able to discuss due to project/corporate policy/practice.

I can fully appreciate not being able to talk about certain work-stuff.

However, I didn't know if my observation was an anomaly symptom, an exercise in adjusting gains/CCD-voltage or possibly some environmental (radiation/magnetic field) effect that could now be observed with this unusually long duration and distant image sequence.
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mcaplinger
post Apr 30 2023, 07:23 PM
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QUOTE (Brian Swift @ Apr 24 2023, 10:56 PM) *
However, I didn't know if my observation was an anomaly symptom, an exercise in adjusting gains/CCD-voltage...

There is no adjustability of gains or CCD voltage in Junocam. About the only thing that can be controlled, to some degree, is the camera head temperature. From the Junocam paper:

QUOTE
An additional pair of PRTs and redundant etched-foil heaters are attached to the outside of the camera head and thermostatically controlled by the spacecraft.



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Disclaimer: This post is based on public information only. Any opinions are my own.
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mcaplinger
post Apr 30 2023, 07:25 PM
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https://www.missionjuno.swri.edu/junocam/think-tank?id=80

QUOTE
Unfortunately, as Juno encounters more and more radiation, so many bits are changed that the damage is sometimes beyond the ability of the ECC to correct. This results in unrecoverable errors to the compressed Junocam data... We held back these images from the normal processing flow to avoid confusion, but provide them separately in case anyone wants to try their hand at repair.



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Disclaimer: This post is based on public information only. Any opinions are my own.
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Bjorn Jonsson
post May 3 2023, 11:20 PM
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These images are really challenging to process but it should be possible to get useful results in all areas where at least one color channel has useful data, at least if it's red or green. There are of course the 16x16 pixel blocks of bad data that I will probably set to black (hopefully automatically but I'm not sure it's possible for all of these blocks).

Another nasty problem is that there are some blocks of good data that have 'moved' from their correct location. This is most obvious near the limb (from PJ49_107):

Attached Image


There are also obvious problems where the limb is not visible. Here something strange is happening in the red data (from PJ49_107):

Attached Image


Most of these problems can probably be fixed be moving these blocks of pixels to their correct location. However, this is a lot of work if it has to be done manually. I doubt it is possible to automatically determine the correct location of these blocks of pixels. It might be possible in some cases where the limb is visible though.
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Kevin Gill
post May 4 2023, 03:42 PM
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Oh, man, is that some gnarly data. I made a quick attempt at the easiest one (JNCE_2023060_49C00113_V01), making liberal use of inpainting to replace the glitched areas and the enormous quantity of noise.



Jupiter - PJ49-113
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Brian Swift
post Aug 1 2023, 03:47 PM
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Jupiter's Galilean Moons Revealed! Rare JunoCam Time-Lapse of 1700 Images - Never-Before-Seen Perspective (#thanksChatGPT)
https://youtu.be/gkoSvHH2gYI
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volcanopele
post Oct 31 2023, 10:05 PM
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The PDS release of the PJ49 data was last week so here are some processed JIRAM products from that Io encounter:

M-band stack (with colorized overlay on basemap)
Attached Image


L-band stack (with colorized overlay on basemap)
Attached Image


Color merge of both L- and M-band observations (greyscale areas are M-band only) - in general yellow/white is hotter than red/orange hotspots
Attached Image


Experimental merge between that color product and the PJ55 basemap
Attached Image


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