urn:nasa:pds:magellan_gravity:gravity:shgj180u 1.0 1.20.0.0 Product_Observational Sjogren, William L. 1997 Coefficients and related data for the MGNP180U Spherical Harmonic model of the Venus gravity field. 2023-09-06 1.0 Product migrated to PDS4 from PDS3. Magellan Mission urn:nasa:pds:context:investigation:mission.magellan data_to_investigation Magellan Host urn:nasa:pds:context:instrument_host:spacecraft.mgn is_instrument_host Radio Science Subsystem Instrument urn:nasa:pds:context:instrument:mgn.rss is_instrument Venus Planet urn:nasa:pds:context:target:planet.venus data_to_target SHXDR 5758 15019 JET PROPULSION LABORATORY shgj180u.a01 1997-12-17T00:00:00.000 16471 This file contains coefficients and related data for the MGNP180U Spherical Harmonic model of the Venus gravity field. Input data are from radio tracking of the Magellan spacecraft. This product is a set of two ASCII tables: a header table and a coefficients table. Definitions of the tables follow. The Magellan Venus gravity model is known as the Spherical Harmonics Gravity ASCII Data Record (SHGADR) and is produced by the Magellan Gravity Science Team at JPL under the direction of W.L. Sjogren.

0 9638 PDS3

SHADR Header Table 9638 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 8 0 244 reference radius 1 1 ASCII_Real 23 kilometer 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 km 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 km cubed per seconds squared for the planet. For a topography model, set to 0. 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. SHADR Coefficients Table 9882 16470 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 6 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.