Ocean tidal perturbations on the orbit of the satellite 'Starlette'

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Artificial Satellites, Oceans, Orbital Elements, Satellite Perturbation, Tides, Laser Range Finders, Lunar Gravitation, Power Spectra, Satellite Drag, Solar Gravitation, Solar Radiation

Scientific paper

The results of 300 days of worldwide laser ranging of the Starlette satellite to assay orbital perturbations due to ocean tides are reported. A total of 66,012 rangings were made from 10 tracking stations. A numerical model was defined to characterize the ocean tidal potential as an expression of the Starlette orbital elements. Consideration is confined to perturbations on the six orbital elements lasting more than one day. Account is taken of the earth's shape, air drag, solar and lunar gravity, solar radiation pressure, body tide and ocean tide. The tides were found to produce effects on the scale of meters within 5 days, implying that ocean tides must be considered if decimeter accuracy is desired when calculating orbital elements.

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