Juno Perijove 17, December 21, 2018 |
Juno Perijove 17, December 21, 2018 |
Jan 23 2019, 02:07 AM
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#76
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
The analysis of the cloud velocity field of Oval BA in post #71 is based on two images taken within about 10 minutes. The white arrows represent the infered motion within 10 hours. The velocity field can be determined in a meaningful quantitative way from images taken within 10 real-time minutes. Sean's animation is covering a longer time interval. So, the answer is a clear yes. Here the set of maps Seán's animation is derived from. They require some additional registering. But it's well feasible.
Here is an animation of the south polar region during PJ15. Or here a denoised MP4 version. Here a +/-25 days steady flow extrapolation, also infered from a south polar PJ15 image pair. ... and here a preliminary analysis of a larger region, on the basis of two PJ17 images. |
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Jan 24 2019, 03:48 AM
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#77
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Member Group: Members Posts: 214 Joined: 30-December 05 Member No.: 628 |
If a pole-to-pole pass takes about 90 minutes, it will be difficult to remain within camera range of any point in the low latitudes for more than 10 minutes, won't it? For polar regions there should be more time to register motion, but still the fact that you can infer so much longer-term dynamics from the available comparisons is remarkable. It testifies to the quality of both the optics and the processing. Very nice work.
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Jan 24 2019, 11:26 AM
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#78
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Thanks! Near closest approach, it's very hard to retrieve any dynamical data. There, we get a mixture of dynamics and parallax. Thus far, I've been able to retrieve meaningful dynamical data from image pairs taken within six minutes, when the geometry between images isn't changing too much. For closest approach with 3,500 km above the cloud tops, the viewing angle is changing by 120 degrees or so within two minutes. I think, that for those images, it's easier to retrive 3D stereo data than dynamics. But usually, those images are too blurred and of low contrast to find significant displacement fields. At least, it's quite a bit harder to analyse them properly. As a rule of thumb, I'd say, that for ususal perijove passes, it's possible to retrieve more or less reliable velocity data outside +/-45 degrees latitude relative to the latitude of closest approach. Since this closest approach is shifting northward with each PJ pass, the quality of the data for an analysis of the southern hemisphere, including the latitude range of the GRS is improving. But I'm not yet quite at the very limit of processing the images. So, it might be possible to extend the analysis of the dynamics a little further towards the point of closest approach. I'll continue to try.
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Feb 10 2019, 11:52 PM
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#79
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
PJ17 flyby is on youtube.
Here the MP4 version, MP4 scenes, and stills. Near closest approach, there are some visible alignment inaccuracies between the blended scenes. I hope, that you can forgive me. |
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Feb 11 2019, 01:36 AM
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#80
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
I forgive you Gerald!
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Feb 11 2019, 12:23 PM
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#81
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
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Feb 12 2019, 03:30 PM
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#82
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
4k upscale test ( using a new method ) of Gerald's recent PJ17 animation sequence...
4k version on Youtube ...some adjustments to apply before final. -------------------- |
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Feb 13 2019, 09:19 PM
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#83
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
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Feb 14 2019, 06:25 PM
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#84
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
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Feb 14 2019, 08:03 PM
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#85
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
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Mar 19 2019, 12:11 AM
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#86
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Member Group: Members Posts: 425 Joined: 18-September 17 Member No.: 8250 |
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May 3 2019, 05:20 PM
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#87
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Member Group: Members Posts: 425 Joined: 18-September 17 Member No.: 8250 |
360° VR, 8K PJ17 Flyover Time-lapse posted to https://youtu.be/sWnhrBj-PI4
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May 4 2019, 05:10 AM
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#88
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Beautiful work, Brian, thanks!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 6 2020, 08:17 PM
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#89
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Member Group: Members Posts: 425 Joined: 18-September 17 Member No.: 8250 |
Collage of PJ17 images, exaggerated color/contrast.
You can download and explore the full resolution (21920-by-15334) image from Flickr. PJ17 Jupiter Image Collage, Exaggerated Color/Contrast by bswift, on Flickr |
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Oct 13 2020, 03:41 AM
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#90
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Member Group: Members Posts: 291 Joined: 29-December 05 From: Ottawa, ON Member No.: 624 |
Mission extension requested for close flybys of Io, Europa, and Ganymede. Keep your fingers crossed.
https://spaceflightnow.com/2020/10/12/juno-...jupiters-moons/ |
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