2021-11-05, 03:51 PM
Hi BMD,
Glad you like adding extra entries for close approaching MPs. If you entered extra entries for elements from different sources, how well did the computed positions compare? How about for different epochs of osculation? As my results demonstrate a different epoch of osculation results in a different predicted position even using elements from HORIZONS, as expected. I'm surprised by the amount of the difference. The position for the Nov 8 1800h elements is 16' 10" ahead of the position for the Nov 9 0900 elements. The time difference is ~16 minutes along the track.
I just downloaded the NEAs at Today's Epoch from the MPC. The elements for 2019 XS were updated, but the elements for the 2019 XSa-f entries were unchanged.
2021 UO7 has been added to the DB, too. The DBPS found 71 MPs that will be <0.05 AU on Nov 7, 6 of which are the extra entries added for 2019 XS, so 65 MPs! Those things are everywhere.
The MP DB has accepted the extra entries for 2019 XS without causing any problems. This looks like a straightforward way to add additional epoch dates for any MP without having ST4 decide that the positions aren't different enough to retain the new elements.
Phil S.
Glad you like adding extra entries for close approaching MPs. If you entered extra entries for elements from different sources, how well did the computed positions compare? How about for different epochs of osculation? As my results demonstrate a different epoch of osculation results in a different predicted position even using elements from HORIZONS, as expected. I'm surprised by the amount of the difference. The position for the Nov 8 1800h elements is 16' 10" ahead of the position for the Nov 9 0900 elements. The time difference is ~16 minutes along the track.
I just downloaded the NEAs at Today's Epoch from the MPC. The elements for 2019 XS were updated, but the elements for the 2019 XSa-f entries were unchanged.
2021 UO7 has been added to the DB, too. The DBPS found 71 MPs that will be <0.05 AU on Nov 7, 6 of which are the extra entries added for 2019 XS, so 65 MPs! Those things are everywhere.
The MP DB has accepted the extra entries for 2019 XS without causing any problems. This looks like a straightforward way to add additional epoch dates for any MP without having ST4 decide that the positions aren't different enough to retain the new elements.
Phil S.