I know this mission is not meant to study any Jovian satellites, but is Juno going to, by chance, pass near enough to any satellites (particularly small, not well imaged satellites) that it could take any useful pictures of them? (Or will it be possible to finagle the final de-orbit burn to send it past a satellite for this purpose?)
At the press briefing it was stated that although Juno will not get close to Jupiter's moons it will be taking pictures and because of it's polar orbit will get never before seen looks at the moons.
In the Planetary Radio talk I've referenced, Candy Hansen mentioned, that Juno is planned to get close to one of the Ring moons. But since those moons are tiny, the moon is expected to show up as a small spot only.
--- Might be, that positional data of the moon can be refined this way.
[I'd think, this thread should better be merged to the Jupiter approach thread.]
MOD NOTE: Edited topic title to make it a generic thread for Jovian satellite observations by Juno. Since there aren't likely to be very many, this may suffice for the mission. However, if subtopics are required we'll split them off as needed.
New images of Ganymede from Juno.
https://www.nasa.gov/feature/jpl/nasa-juno-takes-first-images-of-jovian-moon-ganymedes-north-pole
Decided to start a new topic [I see there was already a topic from four years ago so I'm merging the two] for the discussion of Juno observations of the Galilean satellites, mostly because many of the best observations are by JIRAM and data from that instrument takes a few months to a year to show up in the PDS. There have been observations of moons via JunoCAM at lower resolution that have been useful, like observations of the Chalybes plume at Io.
The other day, the JIRAM team had a press release showing off their observations of Ganymede from PJ24:
https://photojournal.jpl.nasa.gov/catalog/PIA23988
They don't say in the caption but I presume that the blue and green channels use L band data (3.455 µm) and the red channel uses M band imaging (4.78 µm). Let's take a look at the M band data since there are more surface feature contrast:
That's a cool demonstration, Jason. If you wanted to take it one step further, another factor determining luminance across the image is the phase angle, so if you divided those by images of lambertian spheres at the same phase, you'd get a closer match to the local albedo. (Mainly, the terminator would not seem excessively bright.)
Unfortunately it didn't hit the small unmapped region near the north pole on the other hemisphere. It is nice to see Juno can image the Galileans with detail. Even if low resolution, any imagery of that area would be suitable to fill in the roughly 3 percent of Ganymede Galileo missed. Juno's orbit is adequate to imaging the unmapped areas around the poles.
Any more future bonus moon images?
Finally got around to adding a Juno section to my small webpage of Io images:
https://pirlwww.lpl.arizona.edu/~perry/Juno/
Mostly consists of JIRAM data though there are a few JunoCAM images thrown in. Tried to maintain a standard format of the summed JIRAM image on the left and a gradient map version overlaid on an Io basemap on the right. Images are magnified 10x from the original data.
For PJ57 and 58, there are some sample JunoCAM preview images, though keep in mind that JunoCAM will not get all those images due to data volume considerations and other constraints.
Updated the above page to include images from PJs 40, 41, 43, and 47. Sorry that took a bit longer than expected.
https://pirlwww.lpl.arizona.edu/~perry/Juno/
Another update to my Juno image page, now with JunoCam images from PJ51 and JIRAM data from PJ47. I also updated the hotspot map.
https://pirlwww.lpl.arizona.edu/~perry/Juno/index.html
Do you plan to map the Juno images too?
I do have JunoCam maps in Arc Pro. Maybe I'll release a few with PJ53.
That would be awesome because from here on, the Juno passes will improve on older maps especially at the poles with the next 2 passes. If you can, try to map previous passes too, I think PJ51 improved on mapping.
Another update to my Juno image page, now with JunoCam images from PJ53.
https://pirlwww.lpl.arizona.edu/~perry/Juno/index.html
For PJ53, I included a simple cylindrical projection product.
Neat! BTW when will you post on the Gish Bar Times again? Io's finally getting some love from Juno
Maybe that's coming soon? I have a few ideas previewing the encounters. Have to be a little careful, as back in the good ole days of the blog, I could write about whatever I wanted as my work/research tasks didn't overlap. Nowadays though I do some work related to JIRAM in particular, and JunoCam as well. So I do need to be a bit careful scooping myself.
I have a question about post Io operations should Juno manage it. Could Juno eventually be able to flyby and image Amalthea further down the road and accomplish what Galileo was not able to?
Are the "image times" at https://pirlwww.lpl.arizona.edu/~perry/Juno/pj55.htm in UTC?? Trying to find times of closest approach
The reference trajectory for Juno has been updated (spk_ref_231110_251016_231110.bsp). This includes the updated Io encounters in 2024 and 2025 that Scott Bolton mentioned at OPAG back in May, though some of the distances have been adjusted since that presentation. Here is that update. First table has the encounters through PJ58 which are unchanged, and then the post-PJ58 encounters.
I did a little math on the possibility of a worthwhile Amalthea image – for favorable geometry to occur by happenstance without planning for it is rather unlikely, even if Juno's orbit eventually spends a few orbits intersecting the equatorial plane of Jupiter near the semimajor axis of Amalthea's orbit. I wonder if there's been any checking of the possibility.
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