The orbit of Lageos and solar eclipses

Details The orbit of Lageos and solar eclipses The orbit of Lageos and solar eclipses

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.9399r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Sept. 30, 1985, p. 9399-9402. Previously announced in STAR as N84-225

Physics

5

Lageos (Satellite), Orbit Calculation, Radiation Pressure, Satellite Perturbation, Solar Eclipses, Acceleration (Physics), Axes (Reference Lines)

Scientific paper

An eclipse of the sun by the moon as seen by the Lageos satellite can affect the orbital semimajor axis at the centimeter level. The weakened radiation pressure acting on Lageos perturbs the orbit differently from that due to full sunlight. This difference amounted to less than 2 mm in the semimajor axis for 23 of the 30 eclipses Lageos experienced between launch in 1976 and the end of 1983. However, it was 17.6 mm for the eclipses on 28 March 1979 and 11.2 mm for the one on 15 December 1982. Differences such as these generate large enough along-track errors to make it worthwhile to include eclipses in complex orbit determination programs such as GEODYN which integrate the orbit. Eclipses cannot explain the presently unmolded variations in along-track acceleration which have a magnitude of about 3 x 10(-12) ms(-2).

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