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-EROS/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