Juno perijove 7: GRS images, July 11, 2017 |
Juno perijove 7: GRS images, July 11, 2017 |
Jun 30 2017, 12:38 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
There are another three days left over to vote for Perijove-07 points of interest (POI).
This time, all eyes will be on the Great Red Spot (GRS). Provided everything works as scheduled, one RGB image will be made almost above the center of the GRS. I'd think, that this RGB image will be complemented by a methane image. Since this time, we won't have contact with Earth during the flyby, the amount of data to be collected is rather constraint. Therefore, only a small number of images of the polar region is scheduled, just enough for a long-term observation. Storage will be sufficient for imaging several POIs to be voted for, but we may not get a full latitudinal coverage. In order to obtain a full latitudinal coverage of the GRS and adjacent regions, we should take at least one image near the northern and one image near the southern edge of the GRS, better a set of five RGB images. We would see the GRS from different angles, and we would be able to study the turbulence north and south of the GRS. I'd also expect, that only images from north and south of the GRS will be able to cover most of its longitudinal extent. In addition, a sequence of images near the GRS would provide the raw material for a great and unprecedented fly-over movie. That said, there are several other interesting or potentially interesting targets to consider. Besides for an adjacent region of the GRS, I voted for the two polar-most POIs, since I hope, that we'll get some additional polar and subpolar images for a long-term study, and more close-ups of those incredibly turbulent FFR zones near the poles. |
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Jul 13 2017, 01:56 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
How do I have to understand these images? I'm always under the impression that the middle of the image is exaggerated, and so the GRS seems to be much much bigger than what we would see on the traditional images. A kind of Fish-eye effect. The 'original' ( I know this is composed and stitched from the real original R B G images ) image looks a bit more natural to me: Is it because I'm used to rectangular images and the rounding at the top and bottom of the 'original' image as a matter look like being border of the planet? In this context map I do see that that's not the case ... This is a PJ-4 context map plus images from John Rogers' excellent summary of the PJ-4 JunoCam observations: https://britastro.org/node/9274 And yes, many of the processed GRS images exhibit a Fish-eye like effect due to the very large field of view. Here is for example a quick and dirty perspective render of image PJ7_60 from Juno's position when the PJ7_60 framelets were obtained. It has a field of view of 124 degrees (!), this very large FOV is needed to show all of Jupiter from limb to limb. For this not to look distorted you need to be *very* close to the screen when looking at the image. EDIT: And here is also a perspective render showing what this could like like as seen from the Earth. Here the field of view is very small: |
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