Paul Gabriel wrote: > I thought that trakstar265 and skymap64 used the same orbital model calculations, > but skymap's prediction was about 5 sec time slow (based on the insertion of the time > on skymap trak) compared to trakstar and my obs. not that this is a major problem, > but it helps me to better plan and observe knowing that once I pick out a pos_obs point, > I should then run trakstar to get a closer estimate of the time prediction. Paul, if either of this programs is more accurate (which is doubtful for this case), it is SkyMap not Trakstar. SkyMap's coding of SGP4/SDP4 has been rigorously tested and has indeed led to discoveries of minor coding errors BY SPACE COMMAND of their own publically released algorithms. I corrected these errors long ago, and posted code corrections to this list and elsewhere. A few have made those corrections (including JPL); many have not. While this should not in general have an effect on predictions of LEO's like USA 129, I will guarantee that if any errors remain in SkyMap's coding of Space Command's algorithms, they are shared by ALL publically available programs. --Rob ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Wed Jul 19 2000 - 10:28:07 PDT