An analysis of near-circular lunar mapping orbits |
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Authors: | R V Ramanan V Adimurthy |
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Institution: | (1) Aeronautics Entity, Vikram Sarabhai Space Centre, 695 022 Thiruvananthapuram, India |
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Abstract: | Numerical investigations have been carried out to analyse the evolution of lunar circular orbits and the influence of the
higher order harmonics of the lunar gravity field. The aim is to select the appropriate near-circular orbit characteristics,
which extend orbit life through passive orbit maintenance. The spherical harmonic terms that make major contributions to the
orbital behaviour are identified through many case studies. It is found that for low circular orbits, the 7th and the 9th
zonal harmonics have predominant effect in the case of orbits for which the evolution is stable and the life is longer, and
also in the case of orbits for which the evolution is unstable and a crash takes place in a short duration. By analysing the
contribution of the harmonic terms to the orbit behaviour, the appropriate near-circular orbit characteristics are identified. |
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Keywords: | Lunar mapping orbit maintenance orbit life time lunar gravity model spherical harmonics |
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