Re: Strange jumps of Pluto between 2246 and 2247
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Many thanks for your research, Brandon.
Since 2248 uses the new elements and this date produces wildly incorrect positions, I would suggest reverting back to the older elements.
For reference, I ran a quick check on Horizons and for?9/27/2248 it reports 16:55 -11:55 so the old elements are still within a few degrees.
On Mon, Jan 24, 2022 at 12:48 PM Brandon Rhodes < brandon@...> wrote: On Mon, Jan 24, 2022 at 2:27 PM Brandon Rhodes via <brandon= [email protected]> wrote: 1. I confirm your report using XEphem 4.0.1 but I can also report the?jumping does NOT happen with my legacy 3.7.6 so?SOMEBODY BROKE SOMETHING.
Back in July, someone offered to update the Pluto orbital elements ¡ Here's the code update they suggested:
I have just tested and can confirm that the above-linked commit is the one that introduced the discontinuity. Apparently this new elliptical orbit for Pluto does not provide a smooth join with the ¡°chap95_pluto¡± Pluto positions that "planpos()" uses over the time period from?CHAP_BEGIN to?CHAP_END which, it appears, are the dates?1689/3/19 through?2247/10/1.
I'm open to ideas about the best way to resolve this. Should we revert the improvement and go back to our old Pluto ellipse?
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