Thanks everyone who has given me useful pointers - as usual the answer was right in front of my nose! I have the SGP4/SDP4 orbital model code which of course recovers the semimajor axis and perigee from the input elements. I just change Perigee = (aodp*(1 - eo) - ae)*xkmper to (aodp*(1 + eo) - ae)*xkmper in order to recover the Apogee (I think!?) Thanks again, James ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
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