Farside Gravity Field of the Moon from Four-Way Doppler Measurements of SELENE (Kaguya)

Namiki, Noriyuki; Iwata, T.; Matsumoto, Koji; Hanada, Hideo; Noda, Hirotomo; Goossens, Sander; Ogawa, Mina; Kawano, Naoki; Asari, Kazuyoshi; Tsuruta, Seiitsu; Ishihara, Yoshiaki; Liu, Qinghui; Kikuchi, Fuyuhiko; Ishikawa, Toshiaki; Sasaki, Sho; Aoshima, Chiaki; Kurosawa, Kosuke; Sugita, Seiji; Takano, Tadashi

doi:10.1126/science.1168029

Cited by 170 publications

(132 citation statements)

References 22 publications

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“…In comparison between adjacent Poincaré and Planck basins of similar size, older, less distinct Poincaré shows stronger positive gravity anomaly suggesting a stronger Moho uplift. The observed anomaly beneath these basins corresponds to Type 2 like anomaly 1) , where a significant uplift at basin center is probably due to overcompensation just after the impact. Probably thermo-mechanical properties of materials beneath Poincaré and Planck basins were different, or subsurface temperature under Planck was higher than that under Poincaré: later relaxation would have depressed or relaxed a Moho uplift beneath Planck.…”

Section: Small Basins Within and Around Spamentioning

confidence: 99%

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Structure of the South Pole-Aitken Basin from KAGUYA Selenodesy Data

Sasaki

Ishihara

Goossens

et al. 2012

AEROSPACE TECHNOLOGY JAPAN

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The South Pole-Aitken basin (SPA) is the largest (2500km in diameter), deepest and presumably oldest impact basin in the solar system. SPA was characterized by an ellipse with axes 2400 by 2050 km, but more precise topography and gravity data are necessary to discuss the structure of large basin like SPA. We use localized representation of gravity potential where Slepian functions were used to estimate the gravity field over certain areas of the Moon and a spherical cap area with a radius of 40 degree from the SPA center. The direction of an ellipse denoting the depression is found to be similar to the previous result. The region with the thinnest crust is offset southward from the center of SPA. We analyzed interior structure of small basins in and around SPA. We interpret that a positive gravity anomaly corresponds to a Moho uplift. Just around the rim of SPA, a distinct Moho uplift beneath Schrödinger corresponds to the presence of olivine and obscure circular structure Amundsen-Ganswindt has a significant Moho uplift, suggesting a buried impact structure.

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Section: Small Basins Within and Around Spamentioning

confidence: 99%

“…Using 4-way Doppler tracking with relay satellite OKINA, KAGUYA obtained the first precise gravity field of the lunar farside 1) .…”

Section: Kaguya (Selene) Was Launched Onmentioning

confidence: 99%

Structure of the South Pole-Aitken Basin from KAGUYA Selenodesy Data

Sasaki

Ishihara

Goossens

et al. 2012

AEROSPACE TECHNOLOGY JAPAN

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“…2. Recent lunar explorers such as Kaguya [34] and GRAIL [35,36] may improve this upper bound. In addition, future measurements with lunar surface transponders such as those proposed by Gregnanin et al [37] will be available for setting constraints on h c .…”

Section: Discussionmentioning

confidence: 99%

Upper limit on the amplitude of gravitational waves around 0.1Hz from the Global Positioning System

Aoyama¹

2015

Proceedings of KMI International Symposium 2013 on “Quest for the Origin of Particles and the Universe — PoS(KMI2013)

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The global positioning system (GPS) is composed of thirty one satellites having atomic clocks with 10 −15 accuracy on board and enables one to calibrate the primary standard for frequency on the ground. Using the fact that oscillators on the ground have been successfully stabilized with high accuracy by receiving radio waves emitted from the GPS satellites, we set a constraint on the strain amplitude of the gravitational wave background hc. We find that the GPS has already placed a meaningful constraint, and the constraint on the continuous component of gravitational waves is given as hc < 4.8 × 10 −12 (1/f ) at 10 −2 f 10 0 Hz, for stabilized oscillators with ∆ν/ν ≃ 10 −12 . Thanks to the advantage of the Doppler tracking method, seismic oscillations do not affect the current constraint. Constraints on hc in the same frequency range from the velocity measurements by the lunar explorers in the Apollo mission are also derived.

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“…Kaguya measured the gravitational anomaly of the whole Moon, using a four-way Doppler technique employing the relay sub-satellite Okina, to track the Kaguya spacecraft flown in the lunar farside. The gravity free-air anomaly of multi-ring type in the farside can be compared with the mass-concentration type anomaly in the nearside 18) . An error of low-degree spherical harmonic coefficients which contribute to the polar moment of inertia and the k 2 Love number was also reduced in the Kaguya gravity model SGM100h comparing with the Lunar Prospector model LP100K.…”

Section: Chemical Constituents Of the Moonmentioning

confidence: 99%