Estimating Mercury's 88-day libration amplitude from orbit

Jehn, R.; Corral, C.; Giampieri, G.

doi:10.1016/j.pss.2003.12.012

Cited by 18 publications

(17 citation statements)

References 10 publications

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“…The amplitude of the sin 2M term is about 11% of that (Jehn et al 2004). The amplitude of the forced libration depends on the geophysically interesting ratio (B −A)/C m .…”

Section: Spin-orbit Resonance and Librationmentioning

confidence: 92%

Mercury’s Interior Structure, Rotation, and Tides

et al. 2007

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This review addresses the deep interior structure of Mercury. Mercury is thought to consist of similar chemical reservoirs (core, mantle, crust) as the other terrestrial planets, but with a relatively much larger core. Constraints on Mercury's composition and internal structure are reviewed, and possible interior models are described. Large advances in our knowledge of Mercury's interior are not only expected from imaging of characteristic surface features but particularly from geodetic observations of the gravity field, the rotation, and the tides of Mercury. The low-degree gravity field of Mercury gives information on the differences of the principal moments of inertia, which are a measure of the mass concentration toward the center of the planet. Mercury's unique rotation presents several clues to the deep interior. From observations of the mean obliquity of Mercury and the low-degree gravity data, the moments of inertia can be obtained, and deviations from the mean rotation speed (librations) offer an exciting possibility to determine the moment of inertia of the mantle. Due to its proximity to the Sun, Mercury has the largest tides of the Solar System planets. Since tides are sensitive to the existence and location of liquid layers, tidal observations are ideally suited to study the physical state and size of the core of Mercury.

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“…The amplitude of the sin 2M term is about 11% of that (Jehn et al 2004). The amplitude of the forced libration depends on the geophysically interesting ratio (B −A)/C m .…”

Section: Spin-orbit Resonance and Librationmentioning

confidence: 92%

Mercury’s Interior Structure, Rotation, and Tides

et al. 2007

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show abstract

“…[94] (Peale, 1972), and the amplitude of the sin 2M term is about 11% of that ( Jehn et al, 2004;Van Hoolst et al, 2012). Because of its dependence on the mantle moment of inertia, the forced libration amplitude offers a unique opportunity to study the deep interior of Mercury.…”

Section: Forced Librationmentioning

confidence: 99%

Rotation of the Terrestrial Planets

Hoolst

2015

Treatise on Geophysics

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“…The amplitude of the related 27-day forced libration in longitude has been used to infer the MoI of the Moon and the probable molten state of its central region (Khan et al, 2004;Williams et al, 2001;Yoder, 1981). In a similar way, measurements of Mercury's 88-day forced libration amplitude in longitude provide clues on the planet's internal mass distribution and coupling between core and mantle ( Jehn et al, 2004;Margot et al, 2007Margot et al, , 2012Peale, 1976Peale, , 1988. From a combined analysis of the rotational and low-degree gravitational field data, the radius of Mercury's outer liquid core and the presence of an inner solid core were inferred Rivoldini and Van Hoolst, 2013;Smith et al, 2012).…”

Section: Rotation and Tidesmentioning

confidence: 99%