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 14 2017, 02:11 PM
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
Thanks. I have updated the post & hope this is closer to the reality for now... apologies for the error.
I will update again once the sums are done. -------------------- |
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Jul 14 2017, 04:17 PM
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
I will update again once the sums are done. In PJ7-0060 the east-west limb-to-limb view centered on the GRS covers about 10 degrees of longitude and the north-south extent of the GRS is about 10 degrees of latitude. See attached grid image (I apologize for this ugly figure, I don't have any good tools to make publication-quality grids.) The scale on Jupiter is pi*2*70000/360 = 1222 km/degree roughly (using 70000 for the radius and ignoring oblateness). Longitudes have to be multiplied by cos(lat) but that's not a big effect at the latitude of the GRS (cos(22) is 0.93). So in this image, the GRS is about 12000 km in vertical extent. That's just about the diameter of the Earth, so your revised image looks about right. Note that the GRS has been shrinking over time, so there are all kinds of estimates for how big it is on the Web, and I wouldn't trust most of them. See http://www.lpi.usra.edu/opag/july2014/pres...-Simon_OPAG.pdf but that's from 2014. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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