Juno Perijove 57, December 30, 2023 |
Juno Perijove 57, December 30, 2023 |
Oct 19 2023, 09:08 PM
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Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I know the first close Io flyby is still a couple of months away but I'm going to go ahead and start up the topic now with a few preview images that the global map from PJ55 into the pixel scale, lighting conditions, and orientation of the highest resolution images that JunoCam would take (illuminated by the sun, there's always a chance for Jupiter-shine images), based on the current reference spk and c-kernel:
This also assumes an image cadence of 1 every other rotation (so 1 per minute). info about the encounter: CODE Perijove Date (UTC) SC Altitude (Io, km) SC Latitude (Io IAU, deg) SC W Longitude (Io IAU, deg) Vinf (Io, km/s) Phase Angle Magnetic Latitude of Io (Jupiter System III, deg) E Longitude of Io (Jupiter System III, deg) True Anomaly of Io (deg) Separation Angle
PJ57 12/30/2023 08:36:00.681 1500.021 63.694 94.641 30.047 108.885 3.418 228.269 248.805 21.175 -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jan 5 2024, 01:36 AM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
ImagePJ57_23:
North is up. The brightness of the nightside has been increased to show details there. By the way, I have noticed that the spacecraft's distance from Io as determined from the SPK kernels isn't totally accurate and this must be corrected. This is not unexpected and was also the case when processing images from the Ganymede and Europa flybys. The error is small but depending on the software used, artifacts may show up in the processed images if this is not corrected (and the START_TIME must also be corrected). The most common artifact seems to be a 'truncated' limb, I have noticed this in several processed images I have seen, in particular PJ57_22. I think ISIS3 does this (I remember also seeing this in a few Jupiter images processed using ISIS3) and my processing pipeline also does this on occasions if the geometry/time is very inaccurate. One example I saw is Kevin's otherwise excellent PJ57_22 image (IIRC he's using ISIS3) - clearly some care has to be taken when using ISIS3 to process the JunoCam images, also these artifacts aren't always obvious. |
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