> I used Humanity Star (which reentered today, 22 March, near 13:15 UT). Humanity Star is very useful because it was in a low orbit too and most notably it wassemi-globular, so we know it has no surface area variation. Any periodic drag variation shown by Humanity Star should therefore be atmospheric in origin. FWIW, Celestrak carries a group of TLEs called "Radar Calibration" which has a number of near-spherical satellites that might also be useful for investigating what the atmosphere is doing on the short term. I believe that there are some other roundish satellites, but it's been a long time since I looked into such matters and don't remember which ones they are. https://celestrak.com/NORAD/elements/radar.txt _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Thu Mar 22 2018 - 17:39:55 UTC
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