Laser observations of the moon-earth distance and related development of investigations of lunar physical libration and the lunar orbit

Astronomy and Astrophysics – Astronomy

Scientific paper

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Earth-Moon System, Laser Range Finders, Libration, Lunar Rangefinding, Astrometry, Earth Orbits, Harmonic Analysis, Radio Interferometers, Ruby Lasers

Scientific paper

Recent laser measurement data on the moon-earth distance, using laser reflectors planted on the moon's surface in Apollo and Lunokhod missions, are evaluated. Laser data on lunar orbit parameters, earth-moon astrometric data and geometry, and third-order harmonics of some earth-moon parameters (principal axis of inertia pointing toward the earth, deviations of lunar plane to the ecliptic) are also cited. Refinements and corrections of lunar ephemerides, the effect of the dynamic coefficient of the earth's flattening, irregularities of the lunar potential, and new values for the position and mass of the planets are reported. Radio interferometric observations of radio signals transmitted by sensors installed on the moon, and astrometric measurements aided by very long base interferometry using extragalactic radio sources, are also mentioned.

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