title: GRGM900C: A degree 900 lunar gravity model from GRAIL primary and extended mission data.
abstract: We have derived a gravity field solution in spherical harmonics to degree and order 900, GRGM900C, from the tracking data of the Gravity Recovery and Interior Laboratory (GRAIL) Primary (1 March to 29 May 2012) and Extended Missions (30 August to 14 December 2012). A power law constraint of 3.6 ×10-4/ℓ2was applied only for degreeℓgreater than 600. The model produces global correlations of gravity, and gravity predicted from lunar topography of ≥ 0.98 through degree 638. The model's degree strength varies from a minimum of 575-675 over the central nearside and farside to 900 over the polar regions. The model fits the Extended Mission Ka-Band Range Rate data through 17 November 2012 at 0.13 μm/s RMS, whereas the last month of Ka-Band Range-Rate data obtained from altitudes of 2-10 km fit at 0.98 μm/s RMS, indicating that there is still signal inherent in the tracking data beyond degree 900.
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA.
authors.forename: Frank G
authors.initials: FG
authors.lastname: Lemoine
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA ; CRESST, University of Maryland, Baltimore County Baltimore, Maryland, USA.
authors.forename: Sander
authors.initials: S
authors.lastname: Goossens
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA.
authors.forename: Terence J
authors.initials: TJ
authors.lastname: Sabaka
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA ; Emergent Space Technologies Greenbelt, Maryland, USA.
authors.forename: Joseph B
authors.initials: JB
authors.lastname: Nicholas
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA ; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts, USA.
authors.forename: Erwan
authors.initials: E
authors.lastname: Mazarico
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA.
authors.forename: David D
authors.initials: DD
authors.lastname: Rowlands
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA ; Stinger Ghaffarian Technologies Inc. Greenbelt, Maryland, USA.
authors.forename: Bryant D
authors.initials: BD
authors.lastname: Loomis
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA ; Stinger Ghaffarian Technologies Inc. Greenbelt, Maryland, USA.
authors.forename: Douglas S
authors.initials: DS
authors.lastname: Chinn
authors.affiliation: NASA Goddard Space Flight Center Greenbelt, Maryland, USA.
authors.forename: Gregory A
authors.initials: GA
authors.lastname: Neumann
authors.affiliation: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts, USA.
authors.forename: David E
authors.initials: DE
authors.lastname: Smith
authors.affiliation: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts, USA.
authors.forename: Maria T
authors.initials: MT
authors.lastname: Zuber