Hi Thomas, > I used http://science.nasa.gov/RealTime/JTrack/3D/JTrack3D.html to > pick out GOES 6, as a geosynchronous satellite that I should be > able to observe. However, when I tried to plot its location using > SkyMap 6.6 (which I recently got to run on my Windows XP system, > after seeing some SeeSat-L posts a while back), it showed it > trucking right along, about like the HST. Sounds like you may have loaded the two-line elements for GOES 6 R/B (#14051) or (less likely) the GOES 6 apogee kick motor (#14069) instead of GOES 6 itself (#14050). > Does anybody know what the problem is (I noted that SkyMap doesn't > explicitly list the SGDP model, but only SGP4), ... SkyMap uses MSGP4 -- so-called "merged" SGP4. This uses SGP4 for low altitude satellites and SDP4 for high altitude ones. The dividing line on which model is used is the orbital period -- anything with a period greater than 225 minutes gets handled by SDP4. --Rob ----------------------------------------------------------------- To unsubscribe from SeeSat-L, send a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@satobs.org List archived at http://www.satobs.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Wed Nov 12 2003 - 14:18:29 EST