================= Původní zpráva ================= Od (From): "Ed Cannon" <ecannon@mail.utexas.edu> Komu (To): seesat-l@satobs.org Kopie (Cc): Předmět (Subject): Re: BSTAR value Datum (Date): 20. 4. 2004 7:23 ================================================== > >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. > > What about where its perigee is -- at the equator versus > elsewhere, and is the perigee occurring in darkness or > daylight? This yields four conditions: > > near equator in daylight (most drag) > near equator in darkness > away from equator in daylight > away from equator in darkness (least drag) > But IMHO the most pronounced effect on BSTAR change is with the switch between XPOP and LVLH orientation of ISS!? Try to correlate the BSTAR changes with those orientation changes. For timetable of changes see eg. NASA ISS On-Orbit Status archive at my site: http://www.lib.cas.cz/www/space.40/MRPO/INDEX.HTM Mgr. Antonin Vitek, CSc. Office: Main Library, Academy of Sciences of the Czech Republic Narodni 3, CZ-11522 Praha 1 - Phone: +420/221 403 255, fax +420/224 240 611 Home: Kytin 127, CZ-25210 Mnisek p. B., Czech Republic Phone: +420/318 592 865, cell +420/603 148 201 - Coord.: 14.2194 deg E, 49.8488 deg N, 442 m ASL My satellite home page: http://www.lib.cas.cz/www/space.40/index.html Office e-mail: AVITEK@LIB.CAS.CZ ____________________________________________________________ Zaleťte si do EU za české peníze! Amsterdam 2.990 Kč, Barcelona 5.555 Kč…Speciální slevy letenek 35 evropských měst. Létejte po EU s KLM. http://ad.seznam.cz/clickthru?spotId=73630§ion=/ ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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