USA 129 Was: Re: One more iteration
Bjoern Gimle (b_gimle@algonet.se)
Sat, 6 Sep 1997 17:24:58 +0200
I commented the usefulness of
>>
>> 96-72A Pierre Neirinck's elset #110 mean dev 1.7'
>>
Rainer Kracht informed me that Pierre computed
>96-72A orbit #110 from 9 observations Aug 22-27
>
I realize that for some uses, like Ron Dantowitz' high-power
video shots, Pierre's accurate elsets are needed. But they
may include effects of shortlived solar phenomena, as evidenced
by a 20 % change in drag between Pierre's elset #110 and #119
(from day 239.87 to 241.83 !)
USA 129 Pierre's #119 +obs.0718-0903 RMS dev.27' 1016*264 km
1 24680U 96072 A 97241.83890517 .00012910 75204-9 12948-3 0 20
2 24680 97.8381 301.7735 0535209 68.2363 297.4914 14.76610973 06
was computed from 58 observations over 47 days by Russell Eberst
and Peter Wakelin. ( I have written a program to convert a bunch
of mails from both into separate ELCOR files for each object )
ELCOR shows the maximum error to be 2.36 degrees (along+cross track)
FITELEM gives 0.88 degrees cross-track, and 12.3 seconds (!)
along-track ( 3.8 seconds excluding the oldest pass )
This may be useful to amateurs who don't update their elsets
frequently, or just want to detect the large effects of a maneuvre.
NB: My epoch is slightly smaller than Pierre's, so automatic
TLE updaters may reject the elset !
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