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How I set These Up
#46
Hi Greg,

You're correct the observations are king. Unfortuantely for those hunting the fast movers, like BMD, he needs to be pointed close enough to the true position of the MP to get it into his FOV. These things are so fast that getting a position visually would be close to impossible. Just keeping them in the field is tough. Like trying to track an airliner as it flies overhead, but for something invisible in the finder scope  Big Grin.

I think BMD uses HORIZONS because it purports to correct for purturbations plus will provide elements over a range of epoch times that can be input into programs like ST4 that make predictions based on the osculating elements. As you said all these program's predictions are only as good as the elements provided and the elements are only as good as the observations used to generate them. Use of HORIZONS is partially down to convenience. That table of elements for every hour or 2 looks so good.

I do understand some of the limitations because as I mentioned I wrote a program to calculate parabolic osculating elements for comets then refine them to ellipses, all using data from the MPC Circulars. Also had an ephemeris program, too.

If I still had that program & access to the MP discovery data, I could try to make those calculations, but alas my modified Atari ST 520 has gone to hardware heaven.

Please don't think that I think there's a problem with SkyTools. The ST4 calculations are accurately performed. I've been struggling with the MP DB, partly because it's so large; however, I'm currently unwilling to discard the old element sets. FYI, it looks like the MPC is starting to use a new standard epoch of 2022 Jan 20, so next time I download the full MPC data set, there'll be another epoch date in there.

Since I don't do visual observations anymore  Sad, I can't make any checks. Wish I could. Don't miss the mosquito bites, though.

Hope this helps,

Phil S.
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Messages In This Thread
How I set These Up - by bigmasterdrago - 2021-07-09, 02:02 AM
RE: How I set These Up - by PMSchu - 2021-07-09, 02:49 PM
RE: How I set These Up - by theskyhound - 2021-10-08, 08:25 PM
RE: How I set These Up - by bigmasterdrago - 2021-07-09, 04:50 PM
RE: How I set These Up - by PMSchu - 2021-07-09, 09:25 PM
RE: How I set These Up - by bigmasterdrago - 2021-07-13, 04:54 AM
RE: How I set These Up - by bigmasterdrago - 2021-07-09, 09:40 PM
RE: How I set These Up - by PMSchu - 2021-07-09, 10:00 PM
RE: How I set These Up - by bigmasterdrago - 2021-07-09, 10:08 PM
RE: How I set These Up - by PMSchu - 2021-07-13, 01:23 PM
RE: How I set These Up - by bigmasterdrago - 2021-07-13, 03:16 PM
RE: How I set These Up - by razvan - 2021-10-08, 02:11 AM
RE: How I set These Up - by PMSchu - 2021-10-08, 05:18 PM
RE: How I set These Up - by theskyhound - 2021-10-08, 08:42 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-08, 06:34 PM
RE: How I set These Up - by theskyhound - 2021-10-08, 08:29 PM
RE: How I set These Up - by PMSchu - 2021-10-09, 04:30 PM
RE: How I set These Up - by theskyhound - 2021-10-11, 03:19 PM
RE: How I set These Up - by razvan - 2021-10-09, 04:43 PM
RE: How I set These Up - by theskyhound - 2021-10-09, 05:03 PM
RE: How I set These Up - by razvan - 2021-10-09, 06:18 PM
RE: How I set These Up - by theskyhound - 2021-10-10, 04:37 AM
RE: How I set These Up - by razvan - 2021-10-10, 11:30 AM
RE: How I set These Up - by theskyhound - 2021-10-10, 06:25 PM
RE: How I set These Up - by PMSchu - 2021-10-10, 02:41 PM
RE: How I set These Up - by razvan - 2021-10-10, 11:14 PM
RE: How I set These Up - by PMSchu - 2021-10-11, 03:53 PM
RE: How I set These Up - by theskyhound - 2021-10-11, 04:33 PM
RE: How I set These Up - by PMSchu - 2021-10-11, 05:35 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-11, 09:04 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-11, 10:27 PM
RE: How I set These Up - by theskyhound - 2021-10-11, 10:36 PM
RE: How I set These Up - by razvan - 2021-10-11, 10:58 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-12, 12:52 AM
RE: How I set These Up - by PMSchu - 2021-10-12, 04:03 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-13, 02:00 PM
RE: How I set These Up - by PMSchu - 2021-10-13, 03:14 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-14, 12:11 AM
RE: How I set These Up - by PMSchu - 2021-10-14, 04:10 PM
RE: How I set These Up - by theskyhound - 2021-10-14, 06:42 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-15, 01:21 PM
RE: How I set These Up - by theskyhound - 2021-10-14, 06:47 PM
RE: How I set These Up - by PMSchu - 2021-10-14, 06:56 PM
RE: How I set These Up - by theskyhound - 2021-10-15, 04:58 PM
RE: How I set These Up - by bigmasterdrago - 2021-10-18, 01:46 AM
RE: How I set These Up - by theskyhound - 2021-10-15, 04:42 PM
RE: How I set These Up - by PMSchu - 2021-10-15, 06:07 PM
RE: How I set These Up - by theskyhound - 2021-10-15, 06:18 PM
RE: How I set These Up - by PMSchu - 2021-10-15, 06:36 PM

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