If it were closer to 28 days, I would suspect it to modulated by the moon. Are there some other periodicities in the ISS equation of motion that would have that period? Jim. On Mon, 19 Apr 2004, Moritz Heger wrote: > Hello everyone, > > This is slightly off-topic, as it does not directly stand in relation with > visual satellite observing, but I do not know where to ask elsewhere. > > Looking closer on the BSTAR drag value of the ISS over time, I noticed that > it is varying by around 10% with a period of about 20 days. > > Does anyone have an explanation for that behavior? > > Moritz Heger > > > ------------------------------------------------------------------------- > Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: > http://www.satobs.org/seesat/seesatindex.html > Jim Scotti Lunar & Planetary Laboratory University of Arizona Tucson, AZ 85721 USA http://www.lpl.arizona.edu/~jscotti/ ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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