Hi Ted, > So it seems, but I admire your efforts to limit its role to that of the weather. I'm not quite that optimistic! > While trying to recreate the transit of Jupiter by ISS videotaped by Gary Trapuzzano I finally realized they'd gotten the track from what I posted for Tony Phillips, which he mentioned on Science@NASA: http://science.nasa.gov/headlines/y2004/12may_issjupiter.htm I restored the track I'd generated... http://iss-transit.sourceforge.net/IssJupiterEncounter-13may04.txt (At that time, I hadn't fully implemented GTOPO30/SRTM30, so the transit track represented 0 elevation.) I was rather busy around that time, and I must have misread what Gary said- I didn't pick up on the (supposed) fact that subsequently, they determined the precise location of their observation site. > since OIG's elsets are derived from observations ... It seems that the MCC elsets must also be based on observations- that is, the starting point must be based upon a measurement of where the ISS is at a particular time. It's my understanding that the "future" MCC TLEs are generated by propagating the orbit by numerical integration- at some point, the orbital state is then converted to TLE form (i.e., an analytical model). In any case, it seems you've discovered something interesting and totally unexpected. I'll certainly be interested in investigating this more when I've got some time (and had some sleep!), and I imagine some others will as well. Tom ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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