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Posted by: volcanopele Sep 29 2023, 06:09 PM

Finished up a set of preview images for this encounter:

https://pirlwww.lpl.arizona.edu/~perry/Juno/pj55.htm

This uses the PJ53 images as a template for image timing, so images every 3 minutes ±10 minutes of C/A then wider spacing outside of that. Juno is oriented so that is off nadir so it does a better job of keeping Io in the middle of the JunoCam FOV (and JIRAM centered on Io as well, which is great as the drift near C/A can lead to only a few images being taken making summed images have poorer quality).

Posted by: Antdoghalo Sep 29 2023, 07:30 PM

This will be the first of 4 flybys that will definitely improve mapping of Io.

Posted by: volcanopele Sep 29 2023, 08:44 PM

Pj53 already helped north of ~65N, particularly with mapping where mountains are.

Posted by: volcanopele Oct 11 2023, 02:38 AM

Finished up my preview video for PJ55:

https://youtu.be/bYP9G8fWRO0?si=ae57n3eA99kIyxVt

Posted by: Decepticon Oct 11 2023, 05:11 AM

I didn't know about Juno's orbit possibly being changed. That is fascinating.

Posted by: volcanopele Oct 11 2023, 04:20 PM

Scott Bolton mentioned it at OPAG back in May and the dates and distances come from that presentation. That change hasn't shown up in the form of a new reference trajectory, so I don't know what the status of that orbit change.

Posted by: Brian Swift Oct 12 2023, 03:49 AM

Very nice. What software are you using for the animation.

Posted by: volcanopele Oct 12 2023, 03:34 PM

I use Cosmographia from NAIF: https://naif.jpl.nasa.gov/naif/cosmographia.html . I have a custom add-on for Juno that uses all the latest kernels and has footprints for JIRAM, JunoCam, and the SRU. I've attached a zip file of it here, but note that you still need to gather up all the necessary kernels. I've also attached a txt file copy of my meta kernel so you can see what ones you need to download.

For actually creating the video, I used Final Cut Pro, but I suspect you were asking more about the visualization tool.

Posted by: JohnVV Oct 16 2023, 01:21 AM

[quote name='volcanopele' date='Oct 12 2023, 11:34 AM' post='261936']
I use Cosmographia from NAIF:


i do the same but use celestia with a ton of kernels . My ssc file for the spacecraft is getting a bit long and the folder is 4.9 Gig in size

Posted by: Decepticon Oct 16 2023, 04:05 PM

Was flyby successful?

Posted by: volcanopele Oct 16 2023, 05:31 PM

So far so good. reconstructed c-kernel dropped about 30 minutes ago.

Posted by: Brian Swift Oct 16 2023, 08:50 PM

Looks fairly successful.
Exaggerated Color/Contrast PJ55_29, Io from 11645 km. (north not up)

Posted by: Brian Swift Oct 16 2023, 09:47 PM

Io and Jupiter. PJ55_26. (17706 km altitude over Io)

Posted by: volcanopele Oct 16 2023, 10:04 PM

First image complete. JNCE_2023288_55C00029_V01.

Posted by: Brian Swift Oct 16 2023, 11:21 PM

We've got some plumage, and Jupiter-shine illumination.
PJ55_29 with .5 gamma.

Posted by: Brian Swift Oct 16 2023, 11:50 PM

Looks like there is also a different plume that shows up in images 33 to 36.

Posted by: volcanopele Oct 17 2023, 12:47 AM

Yep, Zamama is still active.

Nope, It's Volund!

Posted by: volcanopele Oct 17 2023, 06:27 AM

9 images complete.

Posted by: Brian Swift Oct 17 2023, 03:02 PM

PJ55 Io Initial downlink images overview, normal-ish color/contrast

Full resolution PNG at https://www.missionjuno.swri.edu/junocam/processing?id=15605

Posted by: volcanopele Oct 17 2023, 08:19 PM

Final montage of 15 images. There are 4 others, 2 at the start and end but their resolution is much lower and don't really add much to the coverage.

Posted by: Tom Tamlyn Oct 18 2023, 04:06 PM

I'm thinking back to the time about 15 years ago when the informed expectation for images of Io was about 9 pixels for the entire image.

Of course no one back then was anticipating the trajectory modifications required by the longer orbit and extended mission timeline.

Posted by: Decepticon Oct 18 2023, 05:03 PM

Makes me wonder if orbit insertion error helped these flybys happen?

Posted by: Explorer1 Oct 18 2023, 08:23 PM

The original trajectory would have flown through the radiation belts much more often. How much instruments would have degraded by now is hard to say (but it's definitely serendipitous!)

Posted by: StargazeInWonder Oct 18 2023, 09:34 PM

Funny, because the success of this flyby led me to muse over an impractical hypothetical scenario where the Galileo Orbiter, in response to its antenna issues, was put into a "parking" orbit with minimal radiation belt flybys until a relay orbiter could be flown out to join it and let the mission resume with the combination of Galileo's instruments and high-throughput data transfer. I'm sure that that would have been wildly impractical, but this phase of Juno's mission has just a touch of the spirit of that. We now have the data throughput asset that Galileo lacked.

Posted by: mcaplinger Oct 18 2023, 09:39 PM

But it would have taken data much more frequently near Jupiter, so even though the mission has been a lot longer, the amount of science data is more or less the same. Satellite encounters notwithstanding.

Posted by: volcanopele Oct 20 2023, 09:51 PM

Global map using images from PJ55

Posted by: Bjorn Jonsson Oct 24 2023, 11:50 PM

My version of the PJ55_29 image:

As mentioned in previous posts, a volcanic plume is visible near the limb at lower right in the PJ55_29 image. Here its brightness has been greatly exaggerated relative to other parts of the image.
North is up and this image is enlarged by a factor of 3 relative to the original, raw data.

Posted by: volcanopele Oct 25 2023, 01:06 AM

That plume is Prometheus, also seen on PJ53.