An improved lunar moment of inertia determination: a proposed strategy

Ananda, M. P.; Ferrari, A. J.; Sjogren, W. L.

doi:10.1007/bf00566854

Cited by 8 publications

(3 citation statements)

References 16 publications

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“…1a and 1b). As pointed out by many previous authors (e.g., Solomon 1974, Ananda et al 1977, the mass and moment of inertia of the Moon are insensitive to the presence of a very small core. This is illustrated in Fig.…”

Section: Models Of Composition and Internal Structure Of The Moonmentioning

confidence: 89%

“…We adopt the values I/MR 2 = 0.3931 ± 0.0002 for the mean moment of inertia of the Moon from recent Lunar Prospector gravity measurements (Konopliv et al 1998), R = 1738 km and ρ = 3.3437 ± 0.0016 g cm −3 for the mean radius and density (Ananda et al 1977, Hood 1986, and a seismic velocity model (Nakamura 1983) consisting of three constant-velocity zones (the upper, middle, and lower mantle) with sharp discontinuous boundaries at depths of 270 and 500 km. The internally consistent determination of the chemical composition and density distribution in the zoned mantle, combined with the mean seismic velocities as well as with the mass and moment of inertia constraints, suggests the presence of a core: 310-320 km in radius for the Fe core (1.4% of total mass) and 430-440 km for the eutectic Fe-FeS core (2.4%), Fig.…”

Section: Models Of Composition and Internal Structure Of The Moonmentioning

confidence: 99%

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Core Sizes and Internal Structure of Earth's and Jupiter's Satellites

Kuskov

Kronrod

2001

Icarus

100

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Section: Models Of Composition and Internal Structure Of The Moonmentioning

confidence: 89%

Section: Models Of Composition and Internal Structure Of The Moonmentioning

confidence: 99%

Core Sizes and Internal Structure of Earth's and Jupiter's Satellites

Kuskov

Kronrod

2001

Icarus

100

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“…ANANDA et al (1977) showed how the amplitude of the physical libration is sensitive to the density of the lunar core. According to their result, sensitivity of 10-4 in the amplitude of the physical libration is equivalent to that of 0.1 gr/cm3 in estimation of density of the lunar core if the radius of the core is 400 km.…”

Section: Observation Of the Librationsmentioning

confidence: 99%

Study of the Lunar Core by VLBI Observations of Artificial Radio Sources on the Moon

Hanada

Ooe

Kawaguchi

et al. 1993

J. geomagn. geoelec

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Differential VLBI technique can measure the variation in the angular distance between two artificial radio transmitters on the Moon with an accuracy of a few centimeters. We can observe the physical librations of the Moon through this technique since rotation of the Moon changes the angular distance. The gravitational field of the Moon can also be determined by observations of the angular distance between the radio source on the Moon and that on a lunar orbiter. Calculations show that this technique can determine the amplitude of the physical librations with an accuracy of 10-5 which are one or two orders higher than those obtained by using the Apollo Lunar Surface Experiments Package in 1970's. We can estimate the density and the radius of the lunar core through accurate amplitude and period of the librations together with seismic observations. The accuracy of determination of the lunar gravity harmonics of degree 2 derivable from the VLBI observations are in the range from 10-4 to 10-6. We are developing radio transmitters which will be put on the lunar surface by hard landing from the lunar orbiter.

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