Juno at Jupiter, mission events as they unfold |
Juno at Jupiter, mission events as they unfold |
Jul 5 2016, 07:53 PM
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This topic will consist of discussion of Juno operations post-JOI until end of mission, currently anticipated in Feb 2018.
-------------------- 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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Jul 22 2016, 08:45 AM
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#2
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Junior Member Group: Members Posts: 94 Joined: 11-August 12 Member No.: 6536 |
@Gerald....In the pictures that you posted in Post #25, the edge of Jupiter appears to be blue. Gas molecules in atmospheres tend to scatter blue light, so I'm wondering if that is real or if it is an artifact of processing. If it is real, then do you think it would be possible to point Junocam towards the horizon when we get closer to the planet to see if there are any clouds or haze layers visible in the atmosphere?
My understanding is that Junocam rotates with the spacecraft, so it seems like it would be possible to take a picture when the camera sweeps across the edge of the planet. This shot from the ISS gives an idea of what I have in mind. I know that Juno is in a higher orbit than ISS but Jupiter has a larger diameter than earth and the scale height of the atmosphere is higher, so maybe it would work out. There's also artistic and public relations reasons to do this. The public likes novelty, and this is an angle on Jupiter which has never been seen before. Another reason to point the camera towards the horizon would be to capture the aurora. That would probably require a fair amount of luck or clever timing, but it might be possible because Jupiter's aurora run continuously. Here is a stunning ISS aurora picture. This sunset picture from ISS is gorgeous as well and the viewing geometry enables you to appreciate the vertical structure of the clouds. I think the low sun angle is making the clouds stand out against the background. Junocam is going to have a lot less resolution than this, but maybe Jupiter clouds are bigger. Here's another ISS picture showing the potential of low sun angles. |
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Jul 22 2016, 10:29 AM
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#3
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
@Gerald....In the pictures that you posted in Post #25, the edge of Jupiter appears to be blue. Gas molecules in atmospheres tend to scatter blue light, so I'm wondering if that is real or if it is an artifact of processing. It's clearly an artifact of processing. You need to know, either explicitely or implicitely, camera parameters down to 4 or 5 decimals to obtain subpixel-accurate registering. And even then, a tiny blur, be it from the camera or from processing, induces a colored margin on at least one side of Jupiter. Those images are enlarged considerably, so you see each small flaw in the color registering. I played a bit with Juno's angular velocity in terms of JunoCam interframe delay, but didn't find the perfect solution (yet). Since there are several sensitive parameters, it's very hard and time-consuming to find a set of parameters which is optimal for all circumstances. M.Caplinger used a different approach for the movie, and just aligned the color bands without considering precisely the properties of the camera. But I'll need the approach with the parameters for the perijove images. "That said", Jupiter's aurora might well become visible in the RGB range, think at the (red) H-alpha line of the Balmer series. But any conclusions wrt auroras from my draft processing would be premature. Clealy visible, however, is the Great Red Spot in some images; you can see it moving within a short sequence of consecutive images. And I think, that some satellite appears occasionally even in these narrow crops; but to verify, first look into the raws in order not to confuse them with hot pixels. RGB processing of Jupiter's horizon will be particularly difficult due to the Juno's fast motion, but I'm nevertheless confident to be able to do so. On the Juno mission site you can lobby for features your consider as most interesting. --- Btw. give me another two hours to prepare parts 1 and 2 of the approach drafts. |
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