urn:nasa:pds:grail_gravity_derived:data_shadr:gggrx_0660pm_sha 1.2 1.18.0.0 Product_Observational 2023-05-24 1.2 Updated file comment regarding principal axis frame 2023-02-01 1.1 Updated a description in the SHADR Coefficients Table 2022-08-12 1.0 Initial version 2012-03-01T16:28:00.000Z 2012-05-29T16:36:00.000Z Gravity Recovery and Interior Laboratory Mission urn:nasa:pds:context:investigation:mission.gravity_recovery_and_interior_laboratory data_to_investigation Gravity Recovery and Interior Laboratory A Host urn:nasa:pds:context:instrument_host:spacecraft.grail-a is_instrument_host Gravity Recovery and Interior Laboratory B Host urn:nasa:pds:context:instrument_host:spacecraft.grail-b is_instrument_host Lunar Gravity Ranging System A for GRAIL-A Instrument urn:nasa:pds:context:instrument:grail-a.lgrs-a is_instrument Lunar Gravity Ranging System B for GRAIL-B Instrument urn:nasa:pds:context:instrument:grail-b.lgrs-b is_instrument Moon Satellite urn:nasa:pds:context:target:satellite.earth.moon data_to_target gggrx_0660pm_sha.tab 2013-09-04T00:00:00.000 This file contains coefficients and related data for the GSFC Lunar gravity field GRGM660PRIM, a degree and order 660 Spherical Harmonic Model. It is a preliminary GSFC gravity field that includes the entire nominal mission of GRAIL tracking data (March 1, 16:30 to May 29, 16:36, 2012). Some details describing this model are: The spherical harmonic coefficients are fully normalized. The reference radius = 1738.0 km The planetary ephemeris is de421 and defines the lunar body-fixed coordinate system in the principal axes frame. A Kaula type power law constraint is applied to the spherical harmonics coefficients for degrees greater than 330 (2.5e-4/n^2). The weighting of the data is 0.05 microns/sec for the 5-s KBRR data and 0.12mm/s for the 10-s 2-way S-band DSN tracking data. The estimated tidal Love numbers are: k20 = 0.024165 +/- 0.000091 k21 = 0.023915 +/- 0.000013 k22 = 0.024852 +/- 0.000017 for an aggregate k2 = 0.02427 +/- 0.000054 k30 = 0.007342+/-0.001534 The reference for the GRGM660PRIM gravity field is LEMOINEETAL2013, published in the Journal of Geophysical Research with the DOI number 10.1002/jgre.20118 . This file is a pair of ASCII tables: a header table and a table of 436920 coefficients plus a value for GM. Definitions of the tables follow. 0 1 The SHADR header includes descriptive information about the spherical harmonic coefficients which follow in SHADR_COEFFICIENTS_TABLE. The header consists of a single record of eight (delimited) data columns requiring 137 bytes, a pad of 105 unspecified ASCII characters, an ASCII carriage-return, and an ASCII line-feed. Carriage-Return Line-Feed 9 0 244 Reference_Raduis 1 1 ASCII_Real 23 Km The assumed reference radius of the spherical planet. Constant 2 25 ASCII_Real 23 For a gravity field model the assumed gravitational constant GM in kilometers cubed per seconds squared for the planet. For a topography model, set to 1. Uncertainty_in_Constant 3 49 ASCII_Real 23 For a gravity field model the uncertainty in the gravitational constant GM in kilometers cubed per seconds squared for the planet. For a topography model, set to 1. Degree_of_Field 4 73 ASCII_Integer 5 The degree of model field. Order_of_Field 5 79 ASCII_Integer 5 The order of the model field. Normalization_State 6 85 ASCII_Integer 5 The normalization indicator. For gravity field: 0 coefficients are unnormalized 1 coefficients are normalized 2 other. Reference_Longitude 7 91 ASCII_Real 23 Degree The reference longitude for the spherical harmonic expansion; normally 0. Reference_Latitude 8 115 ASCII_Real 23 Degree The reference latitude for the spherical harmonic expansion; normally 0. Fill 9 138 ASCII_String 105 SHADR Coefficients Table 244 218790 The SHADR coefficients table contains the coefficients for the Spherical Harmonic Model. Each row in the table contains the degree index m, the order index n, the coefficients Cmn and Smn, and the uncertainties in Cmn and Smn. The (delimited) data require 107 ASCII characters; these are followed by a pad of 13 unspecified ASCII characters, an ASCII carriage- return, and an ASCII line-feed. Carriage-Return Line-Feed 7 0 122 COEFFICIENT DEGREE 1 1 ASCII_Integer 5 The degree index m of the C and S coefficients in this record. COEFFICIENT ORDER 2 7 ASCII_Integer 5 The order index n of the C and S coefficients in this record. C 3 13 ASCII_Real 23 The coefficient Cmn for this spherical harmonic model. S 4 37 ASCII_Real 23 The coefficient Smn for this spherical harmonic model. C_Uncertainty 5 61 ASCII_Real 23 The uncertainty in the coefficient Cmn for this Spherical Harmonic Model. S_Uncertainty 6 85 ASCII_Real 23 The uncertainty in the coefficient Smn for this Spherical Harmonic Model. Fill 7 108 ASCII_String 13 A pad of 13 unspecified ASCII characters. gggrx_0660pm_sha.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed