PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 2880 FILE_RECORDS = 360 ^IMAGE = ("JBE15A07.IMG",1) INSTRUMENT_HOST_NAME = "NEAR EARTH ASTEROID RENDEZVOUS" TARGET_NAME = "EROS" INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" DATA_SET_ID = "NEAR-A-RSS-5-GRAVITY-V1.0" ORIGINAL_PRODUCT_ID = "NEAR15A.BOUGUER" PRODUCT_ID = "JBE15A07.IMG" PRODUCT_RELEASE_DATE = 2001-05-29 DESCRIPTION = "This file contains a digital map of Eros Bouguer radial gravity acceleration derived from radio tracking of the NEAR spacecraft. The observation is Bouguer radial gravity in milligals at the surface referenced to a sphere of 16.0 km radius. The Bouguer anomaly is the observed gravity as given by the indicated gravity model minus the theoretical gravity from a constant density shape model. The shape model is strictly constant density and does not include a density contrast for the regolith. The density is 2.67 gm/cm^3. The shape model is a navigation shape model (see Miller et al., Icarus). The degree one terms are not included in the Bouguer maps which correspond to the center-of-mass and center-of-figure offset. Each coefficient of the theoretical gravity from shape was determined by numerical integration over the surface. This technique is valid for irregular bodies. The 3/(2n+1) multiplier for each coefficient can not be used for irregular bodies as for the planetary topography models. Once the theoretical gravity coefficients are determined, they are subtracted from the measured gravity coefficients to get the Bouguer coefficients. These Bouguer coefficients are then used to plot the gravity to the desired degree and order. The Bouguer map may be from a truncation in degree of a delivered gravity field. The JBE15A07 Bouguer map is computed from a truncated NEAR15A solution (from degree 2 to 7) where 'B' in the file name indicates it is Bouguer gravity, 'E' is for Eros and '15A' indicates the NEAR15A solution, and '07' indicates the maximum degree of the field used to create the map. The map is produced at JPL by Alex Konopliv of the NEAR Radio Science Team." START_ORBIT_NUMBER = 1 STOP_ORBIT_NUMBER = NULL START_TIME = 2000-02-14T16:00:00Z STOP_TIME = 2001-02-12T15:15:00Z SOFTWARE_NAME = "GRVMAP;V1.0" PRODUCT_CREATION_TIME = 2001-05-29T00:00:00Z PRODUCER_ID = "NEAR RADIO SCIENCE" OBJECT = IMAGE LINES = 180 LINE_SAMPLES = 360 SAMPLE_TYPE = "IEEE REAL" SAMPLE_BITS = 64 UNIT = "MILLIGALS" OFFSET = 0.0E+00 SCALING_FACTOR = 1.0E+00 DESCRIPTION = "The Digital Map contains values of the radial gravity. The values can be obtained by multiplying the sample in the map by SCALING_FACTOR and then adding OFFSET." END_OBJECT = IMAGE OBJECT = IMAGE_MAP_PROJECTION ^DATA_SET_MAP_PROJECTION = "DSMAP2.CAT" COORDINATE_SYSTEM_TYPE = "BODY-FIXED ROTATING" COORDINATE_SYSTEM_NAME = PLANETOCENTRIC MAP_PROJECTION_TYPE = "SIMPLE CYLINDRICAL" A_AXIS_RADIUS = 16.0 B_AXIS_RADIUS = 16.0 C_AXIS_RADIUS = 16.0 FIRST_STANDARD_PARALLEL = "N/A" SECOND_STANDARD_PARALLEL = "N/A" POSITIVE_LONGITUDE_DIRECTION = "EAST" CENTER_LATITUDE = 0.0 CENTER_LONGITUDE = 0.0 REFERENCE_LATITUDE = 0.0 REFERENCE_LONGITUDE = 0.0 LINE_FIRST_PIXEL = 1 LINE_LAST_PIXEL = 180 SAMPLE_FIRST_PIXEL = 1 SAMPLE_LAST_PIXEL = 360 MAP_PROJECTION_ROTATION = 0.0 MAP_RESOLUTION = 1.0E+00 MAP_SCALE = "N/A" MAXIMUM_LATITUDE = 89.5 MINIMUM_LATITUDE = -89.5 EASTERNMOST_LONGITUDE = 179.0 WESTERNMOST_LONGITUDE = -180.0 LINE_PROJECTION_OFFSET = 89.5 SAMPLE_PROJECTION_OFFSET = 180.0 END_OBJECT = IMAGE_MAP_PROJECTION END