An analysis of near-circular lunar mapping orbits | Zendy

R. V. Ramanan | Zendy; V. Adimurthy | Zendy

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An analysis of near-circular lunar mapping orbits

Author(s) -

R. V. Ramanan,

V. Adimurthy

Publication year - 2005

Publication title -

journal of earth system science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.444

H-Index - 52

eISSN - 0973-774X

pISSN - 0253-4126

DOI - 10.1007/bf02715946

Subject(s) - circular orbit , orbit (dynamics) , harmonics , physics , spherical harmonics , harmonic , heteroclinic orbit , elliptic orbit , geodesy , classical mechanics , geology , aerospace engineering , bifurcation , engineering , acoustics , quantum mechanics , voltage , nonlinear system , homoclinic orbit

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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