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Posted by: bobik Sep 3 2023, 11:20 AM

The de-spinning mirror of JIRAM is sticking!? When did this happen?

Posted by: volcanopele Sep 4 2023, 02:12 AM

PJ44. Meant that JIRAM missed Europa during last year's flyby. Io data is smeared in PJ47 and PJ44.

EDIT: I should note that the imager data from JIRAM is still quite usable. Our measurements of hotspot intensity from PJ47 weren't affected by the smear. The spectrometer data might not be of much use though....

Posted by: mcaplinger Sep 6 2023, 09:12 PM

I can neither confirm nor deny anything about this. FWIW, I amused myself for a couple of hours going through the JIRAM PDS archive to see if I could tell anything using public info. It certainly isn't something that's emphasized or even mentioned in the archive that I saw. It might be possible to figure it out by looking at the binary engineering files that have mirror state information, but I ran out of gas before getting that far.

Posted by: volcanopele Sep 7 2023, 02:25 AM

You’re clear Mike. Scott Bolton brought it up at OPAG a few months back. The only public info is that the spin-compensation mirror is stuck and has been since PJ44. I have no knowledge beyond the fact that the publicly released JIRAM image from PJ49 was also smeared like PJ47.

Posted by: bobik Sep 8 2023, 05:59 AM

Yeah, the recording can be found https://www.youtube.com/watch?v=rajHsb7CrKU&t=493s. But it may take some time to get detailed information. https://openaccess.inaf.it/handle/20.500.12386/33365

Posted by: Tom Tamlyn Sep 11 2023, 09:50 PM

I trust that "2100" is a typo of some kind?