Morning The link for the latest version of the SGP4/SDP4 code is as follows: http://www.centerforspace.com/downloads/files/pubs/AIAA%202006-6753%20Revisiting%20Spacetrack%20Report%203.pdf The paper - "AIAA 2006-6753 Revisited Space Track Report3.pdf" is about 1.12 Mbytes in size and the code is towards the back of the report. Bruce asked which programs now available have the latest code in it- afraid I dont know the answer but Bill Gray's GUIDE program receives a favourable mention in the paper above for his version of the SGP4/SDP4 code. In reply to Frank Reed's question I think Mike McCants is the best one to answer this. As far as I know - I MAY be wrong! - Mike does not use SGP4/SDP4 in his QUICKSAT and HIGHFLY programs so I think he is the expert in this subject - especially since he gets the right answers. Incidentally SPACETRACK regard anything as not having being tracked within the past 30 days as being "lost" - amazing what amateurs can do with elements a lot older! Finally a welcome to Aleks - author of HEAVENSAT - he is now subscribed to SeeSat and has already posted to the group ( thats why I accidentally caused a double posting - I only got my SeeSat Digest two minutes after I had posted Aleks's reply to me ). Cheers Greg ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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