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 10 2017, 05:37 PM
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Junior Member Group: Members Posts: 23 Joined: 13-October 13 Member No.: 7013 |
I've been asked this a lot...
When will the GRS images be downlinked? These are the factors: * We have no downlink during the perijove pass because the spacecraft is in the MWR attitude. This means that all data must be stored on-board. The JunoCam onboard storage is 1181 Mb. * Once downlink starts we play back engineering first, then FGM, then the other instruments * The instrument round-robin will start at 6:40 am on Tuesday; JunoCam gets roughly 6 min per hour * We start by playing back the images collected at -24 hr. Those images are compressed, so it is difficult to calculate the speed of playback precisely. Also, if other instruments’ buffers empty early then playback of JunoCam data will speed up. * If the GRS images happen to be played back in the middle of the night there is no one at MSSS to see that they’ve arrived - that will happen at open of business * Once we get the actual images we still need the c kernel with the spacecraft attitude to run the processing pipeline. Usually the C kernel arrives within a day of perijove, so this shouldn’t be a delay. * As soon as the raw images are posted we will let everyone know that they are available at missionjuno. Very conservatively I've estimated July 14, expecting that it is likely we'll see them at least a day before. Hope this is helpful!! |
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