Juno PDS data |
Juno PDS data |
Jan 8 2016, 10:15 PM
Post
#1
|
|
Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
There is now PDS-format JunoCam cruise and Earth flyby data available; it's been submitted to the PDS, but MSSS has gone ahead and posted it on their website. I've created an index page to it here. Unlike my usual index pages, there aren't any thumbnails because of the odd nature of JunoCam images, with their long skinny shapes and interleaved framelets. I haven't played much with these data because it's a bit beyond my skill -- I look forward to seeing what any of you can do with it.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
Feb 24 2018, 02:17 AM
Post
#2
|
|
Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Out-of-the-hip, I can only say, that the deviation from orthonormality is small, and I'm not quite sure, whether the values are perfectly constant, since Juno's spin axis might undergo tiny changes. I've run several calibration series on Marble Movie images, and applied the results to images near these series, when highly accurate alignment was recommended. But for the alignment of close-up images, the deviation from orthonormality usually didn't play an obvious role. Errors induced by these inaccuracies are probably on a subpixel level.
I'm presuming, that the main source of residual misalignments in my processing is due to inaccuracies of my optical distortion model. I'm working on this question in small time slices between all the other event-driven activities. However, I don't rely on any of the published ik versions thus far. I think, that the Brownian approach is inherently unstable for wide angles, and I'm inclined to do the math for a different approach, maybe together with an article, if successful. I also cannot entirely rule out some small chromatic aberration, or a tiny deviation of the CCD pixel grid from square. Other possible causes for small misalignments might be deviations of Jupiter from its idealized IAU shape, small oscillations of Juno's solar panels, or a small varying torque-free precession of Juno's spin axis. There are several degrees of freedom that may annihilate each other partially. So, it's not quite trivial to find out the actual physical settings with a high accuracy. |
|
|
Lo-Fi Version | Time is now: 16th June 2024 - 02:52 PM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |