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Lunar Gravity Field Determination Using SELENE Same-Beam Differential VLBI Tracking DataA lunar gravity field model up to degree and order 100 in spherical harmonics, named SGM 100i, has been determined from SELENE and historical tracking data, with an emphasis on using same-beam S-band differential VLBI data obtained in the SELENE mission between January 2008 and February 2009. Orbit consistency throughout the entire mission period of SELENE as determined from orbit overlaps for the two sub-satellites of SELENE involved in the VLBI tracking improved consistently from several hundreds of metres to several tens of metres by including differential VLBI data. Through orbits that are better determined, the gravity field model is also improved by including these data. Orbit determination performance for the new model shows improvements over earlier 100th degree and order models, especially for edge-on orbits over the deep far side. Lunar Prospector orbit determination shows an improvement of orbit consistency from I-day predictions for 2-day arcs of 6 m in a total sense, with most improvement in the along and cross-track directions. Data fit for the types and satellites involved is also improved. Formal errors for the lower degrees are smaller, and the new model also shows increased correlations with topography over the far side. The estimated value for the lunar GM for this model equals 4902.80080 +/- 0.0009 cu km/sq s (10 sigma). The lunar degree 2 potential Love number k2 was also estimated, and has a value of 0.0255 +/- 0.0016 (10 sigma as well).
Document ID
20110023559
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Goossens, S.
(National Astronomical Observatory Iwate, Japan)
Matsumoto, K.
(National Astronomical Observatory Iwate, Japan)
Liu, Q.
(Shanghai Astronomical Observatory China)
Kikuchi, F.
(National Astronomical Observatory Iwate, Japan)
Sato, K.
(National Astronomical Observatory Iwate, Japan)
Hanada, H.
(National Astronomical Observatory Iwate, Japan)
Ishihara, Y.
(National Astronomical Observatory Iwate, Japan)
Noda, H.
(National Astronomical Observatory Iwate, Japan)
Kawano, N.
(Shanghai Astronomical Observatory China)
Namiki, N.
(Chiba Inst. of Tech. Narashino, Japan)
Iwata, T.
(Japan Aerospace Exploration Agency Kanagawa, Japan)
Lemoine, F. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rowlands, D. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Harada, Y.
(Shanghai Astronomical Observatory China)
Chen, M.
(Shanghai Astronomical Observatory China)
Date Acquired
August 25, 2013
Publication Date
December 7, 2010
Publication Information
Publication: Journal of Geodesy
Publisher: Springer
Volume: 85
Issue: 4
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
GSFC.JA.5447.2011
Funding Number(s)
CONTRACT_GRANT: JSPS 20244073
Distribution Limits
Public
Copyright
Other

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