Juno perijoves 2 and 3, October 19 and December 11, 2016 |
Juno perijoves 2 and 3, October 19 and December 11, 2016 |
Oct 26 2016, 04:44 PM
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#1
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Junior Member Group: Members Posts: 23 Joined: 13-October 13 Member No.: 7013 |
A lot has happened and it seemed like a good time to start a new post. We will be staying in 53 day orbits until the project has a full understanding of the risks that may or may not be associated with reducing the orbit period to 14 days per our previous plan.
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Dec 18 2016, 09:07 AM
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#2
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
This gif shows an attempt to fit the images into a mask which simulates a Jupiter spheroid, assuming a constant rotation period of 30.33740 seconds for Juno, and neglecting light travel time:
The rotation period is inferred from PJ3 images 103 and 126. You'll see a black margin at the top or bottom of Jupiter of variable thickness with respect to the ugly turqoise background mask. The most distant images of this sequence are taken from a distance of a little more than 100,000 km. Light takes about 0.3 seconds for this distance. So we get a shift of very roughly 100 pixels in the raw images due to light travel time. This appears to be similar to the observed error. So this will be one of the things which I'll include into my model. If you're using NAIF/SPICE libraries and kernels, this effect should already be considered. Edit: ...hmm, I'm a bit hesitant, whether General Relativity (equivalence principle) allows for this simplification. May be I'd better adjust the angles manually, and then look which physical model fits. |
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