Three-dimensional determination of the center of the Watts datum relative to the lunar center of mass

Statistics – Applications

Scientific paper

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Astronomical Models, Lunar Limb, Lunar Occultation, Selenography, Astronomical Photography, Electrophotometers, Ephemerides, Laser Applications, Lunar Orbits, Mathematical Models, Solar Orbits, Stellar Occultation, Time Lag

Scientific paper

The location of the origin of the Watts datum for the marginal zone of the moon is determined using results of 2770 photoelectric occultation observations obtained over an 18-yr period in combination with 1787 laser time-delay measurements carried out over a five-year period. The lunar ephemeris employed is an experimental one developed from a much shorter span of laser observations. The final solution is obtained by adopting LURE2 parameters and correcting 19 lunar orbital, solar orbital, and coordinate-system parameters. The offsets for the center of the Watts datum are found to be approximately +6.8 km for x1, -2.5 km for x2, and +0.06 km for x3 with respect to the lunar principal axes of inertia.

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