2022-09-24, 09:51 PM
BMD,
I don't know what's involved in precessing the elements from one epoch to another. The old Astronomical Almanac used to have precessing matrices to change between J2000 & some other date, but that was for star positions, not MP elements. The ST4v preprocessing is related to the plotting of MPs on the charts. It speeds the plotting up significantly.
That's a huge discrepancy between the Lowell & MPC positions. That makes it hard to find
.
Phil S.
I don't know what's involved in precessing the elements from one epoch to another. The old Astronomical Almanac used to have precessing matrices to change between J2000 & some other date, but that was for star positions, not MP elements. The ST4v preprocessing is related to the plotting of MPs on the charts. It speeds the plotting up significantly.
That's a huge discrepancy between the Lowell & MPC positions. That makes it hard to find
.Phil S.