Juno Perijove 58, February 3, 2024 Options

[mcaplinger]

(Started a new thread to avoid cluttering up the PJ57 thread with PJ58 discussion.)

[kymani76]

I'm not totally sure, but I believe it is possible to present above discussion in a map form.

The view above shows Io as seen from Jupiter at the time of the flyby. In other words, the center of map projection is at Io's sub-Jupiter point.
This means we are looking at the hemisphere illuminated by Jupiter-shine.

I've used this article to estimate how much of Io's disk Juno can see at selected times.
(17:49 in red, 17:49:30 in green; 17:50 in blue). I used values of 0.25, 0,265 and 0.28 respectively for f to account for the rising altitude, giving me range circles for parts of Io visible to Juno at these times.
You can really see how much the coverage changes in very short time.

I still have to account for Junocam FOV as I suspect not the whole visible disk fits into the camera view, but I haven't figured out how to account for that yet.

And yes, there is no Jupiter-shine on the inbound track.

[mcaplinger]

I still have to account for Junocam FOV as I suspect not the whole visible disk fits into the camera view, but I haven't figured out how to account for that yet.

It's not easy. To do it completely correctly, you need to know the pointing of the spacecraft as a function of time. For many of these flybys, including this one, the spacecraft spin axis (Z) is pointed at Earth, which makes it a little easier. So the Junocam FOV is a locus roughly +/- 30 degrees from the XY plane and spun about the Z axis. If a point on Io is in that locus we can see it, if it's not then we can't. I could imagine sampling a full range of lat/lon, checking to see if that point was in the locus, and drawing a little X there if it was, or something similar.

BTW, after much analysis I decided I couldn't take an image at 17:49, but one did fit at 17:48:30 so I took one there with TDI 12, then three images at 17:50 (TDI 12), 17:51 (TDI 2), and 17:52 (TDI 2). All RGB.

2024-034T17:32:00 RGB 6, 2
2024-034T17:39:00 RGB 2, 12
2024-034T17:48:30 RGB 12
2024-034T17:50:00 RGB 12, 2, 2
2024-034T17:53:30 RGB 12, 6

You have until Monday to change my mind