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Juno Perijove 36
mcaplinger
post Sep 17 2021, 06:46 PM
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QUOTE (Bill Harris @ Sep 17 2021, 09:59 AM) *
Although the next Perijove will be on the other side from this impact point, i wonder if a disturbance could not drift along the Zone over the next Earth month (and many Jovian days) and be seen at that Perijove.

The drift rate is pretty well-characterized by the amateur community, so one could figure this out without a lot of difficulty. http://jupos.privat.t-online.de/

I don't think typical drift rates are high enough to go nearly 180 degrees in a month or so, but that's just an impression.


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Bill Harris
post Sep 18 2021, 12:51 AM
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By now we have an idea of what that local chaos is like and we'll have the quandary of picking out the additional chaos. This will be the first time we've had a spacecraft this close to an event of this nature.

--Bill


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mcaplinger
post Yesterday, 08:31 PM
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QUOTE (mcaplinger @ Sep 17 2021, 11:46 AM) *
I don't think typical drift rates are high enough to go nearly 180 degrees in a month or so, but that's just an impression.

I think that's still more or less true, but I neglected to think about the large rate difference between System I, the rate at which near-equatorial features move in bulk, and System III, which is what we use for navigation. After a month, I think those systems diverge from each other by nearly 140 degrees. See the equations at https://projectpluto.com/grs_form.htm

Regardless, we'll be imaging in October and we'll see what we see.


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