BMD,
If the epoch for the regular NEA file is the standard 2022 Aug 9 00:00 UT, then the file doesn't change very much. There are just a few new additions to the MP DB. For the NEAs at Today's Epoch file, all of the MP's elements need to be updated to the new epoch. Have you ever watched the ST4v dialog while the update is being processed to see how many objects are Added, Updated & Skipped? Every time I download the NEAs at Today's Epoch file there are 0-30 objects Added, ~29.7k Updated & ~2 Skipped. I think that the updating is what's taking the extra processing time. The Technoking could confirm this.
Other than the time savings & the addition of the newly discovered NEOs, I don't see much point to downloading the MPC NEA file. It hardly changes. There might be a daily update available. I prefer to download the NEAs at Today's Epoch file. That provides the new discoveries & the most recent set of osculating elements for the ephemeris calculations.
That's how I believe that the MP processing works. Greg could provide more info, if I've gotten something wrong.
I noticed that CNEOS still doesn't list a close approach for this MP. It's almost within reach of one of the iTelescopes. Maybe I'll try to image it.
Hope this helps,
Phil S.
If the epoch for the regular NEA file is the standard 2022 Aug 9 00:00 UT, then the file doesn't change very much. There are just a few new additions to the MP DB. For the NEAs at Today's Epoch file, all of the MP's elements need to be updated to the new epoch. Have you ever watched the ST4v dialog while the update is being processed to see how many objects are Added, Updated & Skipped? Every time I download the NEAs at Today's Epoch file there are 0-30 objects Added, ~29.7k Updated & ~2 Skipped. I think that the updating is what's taking the extra processing time. The Technoking could confirm this.
Other than the time savings & the addition of the newly discovered NEOs, I don't see much point to downloading the MPC NEA file. It hardly changes. There might be a daily update available. I prefer to download the NEAs at Today's Epoch file. That provides the new discoveries & the most recent set of osculating elements for the ephemeris calculations.
That's how I believe that the MP processing works. Greg could provide more info, if I've gotten something wrong.
I noticed that CNEOS still doesn't list a close approach for this MP. It's almost within reach of one of the iTelescopes. Maybe I'll try to image it.
Hope this helps,
Phil S.