2021-11-04, 07:31 PM
Yes, different epochs. Tonight, 2021 UO7 passes close at 18:08CDT for me at ~17th magnitude 43° below my ENE horizon. The Lowell and MPC position were only 0.03" apart. The JPL position was ~14" NW. Far to small a difference to be concerned about. JPL epoch June 30, Lowell epoch Oct 12, & MPC epoch July 4. Remember that JPL is concerned about impact risks, MPC passes elements to Lowell where the epoch date is standardized, so which is the most believable? I have no idea.
An interesting experiment can be demonstrated about the need to have gravity calculated in plotting. Simply run this simulation: http://www.astrograv.co.uk/blog.html#16_04_22
in the free software.
An interesting experiment can be demonstrated about the need to have gravity calculated in plotting. Simply run this simulation: http://www.astrograv.co.uk/blog.html#16_04_22
in the free software.