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High-degree gravity models from grail primary mission data
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Loomis, Bryant D. Goossens, Sander J. Neumann, Gregory A. Caprette, Douglas S. Lemoine, Frank G. Sabaka, Terence J. Nicholas, Joseph B. Rowlands, David D. Zuber, Maria T. Chinn, Douglas S. Mazarico, Erwan Smith, David E. |
| Copyright Year | 2013 |
| Description | We have analyzed Kaâband range rate (KBRR) and Deep Space Network (DSN) data from the Gravity Recovery and Interior Laboratory (GRAIL) primary mission (1 March to 29 May 2012) to derive gravity models of the Moon to degree 420, 540, and 660 in spherical harmonics. For these models, GRGM420A, GRGM540A, and GRGM660PRIM, a Kaula constraint was applied only beyond degree 330. Varianceâcomponent estimation (VCE) was used to adjust the a priori weights and obtain a calibrated error covariance. The global rootâmeanâsquare error in the gravity anomalies computed from the error covariance to 320Ã320 is 0.77 mGal, compared to 29.0 mGal with the preâGRAIL model derived with the SELENE mission data, SGM150J, only to 140Ã140. The global correlations with the Lunar Orbiter Laser Altimeterâderived topography are larger than 0.985 between l = 120 and 330. The freeâair gravity anomalies, especially over the lunar farside, display a dramatic increase in detail compared to the preâGRAIL models (SGM150J and LP150Q) and, through degree 320, are free of the orbitâtrackârelated artifacts present in the earlier models. For GRAIL, we obtain an a posteriori fit to the Sâband DSN data of 0.13 mm/s. The a posteriori fits to the KBRR data range from 0.08 to 1.5 micrometers/s for GRGM420A and from 0.03 to 0.06 micrometers/s for GRGM660PRIM. Using the GRAIL data, we obtain solutions for the degree 2 Love numbers, k20=0.024615+/-0.0000914, k21=0.023915+/-0.0000132, and k22=0.024852+/-0.0000167, and a preliminary solution for the k30 Love number of k30=0.00734+/-0.0015, where the Love number error sigmas are those obtained with VCE. |
| File Size | 43599 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140010292 |
| Archival Resource Key | ark:/13960/t7hq8z05n |
| Language | English |
| Publisher Date | 2013-08-23 |
| Access Restriction | Open |
| Subject Keyword | Primary 1 Grail High-degree Error Analysis Spherical Harmonics Gravitational Fields Data Processing Lunar Orbiter Gravity Anomalies Data Products Deep Space Network Covariance Lasers Lunar Gravitation Topography Mathematical Models Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
