Hello, > Any explanations about this phenomenon? the motion of a passive object in GEO is perturbed by the gravitational forces of the Sun, the Moon, and the oblateness of the Earth. The combined effect is that the orbital plane does a precession, where the inclination goes from 0 deg to 15 deg and back to 0 deg in about 53 years. The RAAN goes from anywhere to 90 deg, moves to the equinox at max inclination and then towards -90 deg. Here is a link to a page which describes this orbital behavior in more detail: http://members.aol.com/geostat2/geo2.htm Cheers, Sebastian http://www.sebastian-stabroth.de ----------------------------------------------------------------- To unsubscribe from SeeSat-L, send a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@satobs.org List archived at http://www.satobs.org/seesat/seesatindex.html
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