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