Juno perijove 8, September 1, 2017 |
Juno perijove 8, September 1, 2017 |
Aug 21 2017, 09:13 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
It's time to open a Perijove-8 thread. Only a little more than two days are left for voting. For this perijove pass, JunoCam is scheduled to use more memory than during any previous perijove pass. Therefore, we have the best conditions to collect a considerable number of images, and images of good quality.
One of my votes went to an image near the equator, in order to give the ops team the opportunity to take a lossless image from very close up. In previous perijoves, these very close ups suffered a bit from lossy compression. This time, we may have one of the rare chances to find out, whether subtle small features are present, but escaped notice due to high compression rates. My other votes are for the subpolar regions with the fascinating FFRs. But I don't make specific recommendations, since I'm hoping for a full latitude coverage in good quality. Besides their science value, such a sequence will be a good basis for a pole to pole animation. I'm also curious, whether we can learn more about the polar regions. These images are scheduled in any case. Besides low TDI images, I'm hoping for some high TDI images in order to get high S/N for the circumpolar storm systems. For Perijove-8, we'll get approach and departure images for a global map. So close to solar conjunction, those are of more interest than in times with good observational conditions from Earth. Unfortunately, during Perijove-9, obtaining a global map will be much harder, if possible at all. And as a special bonus, an image if Io is scheduled for PJ-08. My time for processing these images is very restricted in September. But I'll try to cover the full suite of close-ups as soon as the raws become available, nevertheless. |
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Oct 1 2017, 12:43 PM
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#2
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
The limb is not fully shown. The images are processed by creating a simple cylindrical map and then using the map to render an image. This 'truncates' the limb near the 1 bar level. That said, I suspect the resolution at the limb isn't higher in the JunoCam images than in many of the Voyager images since the resolution at the limb is much lower than at the nadir (I haven't computed the exact resolution at the limb though).
I have experimented a bit with creating JunoCam color composites showing the limb but the results aren't very interesting. The best processed Voyager image I know of showing the limb is this one from Voyager 1 and there is also a Voyager 2 mosaic. These are also probably the highest resolution color images showing blue sky at the limb that can be processed from the Voyager 1 and Voyager 2 data. |
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