Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cvog.book.....p&link_type=abstract
CCD-Astrometrie von Objekten des geostationären Ringes., by Ploner, M.. Geowissenschaftliche Mitteilungen, Heft 46 (1996),
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The motions of artificial satellites are influenced by gravitational and non-gravitational perturbations. Of special interest among the gravitational perturbations is the anisotropy of the Earth's gravitational field. Orbits of geostationary satellites are extremely sensitive to perturbations caused by the Earth's equatorial ellipticity, which is described by the coefficients C22 and S22 in the harmonic series expansion of the geopotential. In the course of this project, the Zeiss BMK 75 ballistic camera was adapted for CCD observations. After installing the hardware, a two-month observation campaign of the satellites Meteosat 5 and Meteosat 6 as well as two Russian satellites was carried out. The astrometric evaluation of the observations was carried out with the help of the program CCD. Its development was - besides the hardware installation - one of the main tasks of this project. The orbit integration program ORBDET was used for the calculation of the osculating orbital elements and the direct solar radiation pressure of all satellites. Finally, the geopotential coefficients C22 and S22 were calculated from observations of the satellites Meteosat 5 and 6. The results show an extremely low deviation from the corresponding numbers of the well-known gravity model JGM-3.
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