Abstract
The method of estimation of the limits, containing the equator inclination of a celestial body, had been developed. In this method it is necessary to know the orbital elements and the mass of a celestial body. Another condition is that the axial rotation of a body should be in the resonance with its orbital motion. It has been found that the equator inclinations should have the values between 1 ‡.7 and 2 ‡.6 for Mercury and between 1 ‡.0 and 1 ‡.8 for the Moon. It also has been found that largest harmonics in Mercury's physical libration are the harmonics sin(Φ − 3g), cos(Φ − 3g), sin g and sin 2Ω.
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Habibullin, S.T. The limits of possible values of inclination of Mercury's equator. Earth Moon Planet 58, 79–95 (1992). https://doi.org/10.1007/BF00058075
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DOI: https://doi.org/10.1007/BF00058075