PDS_VERSION_ID = "PDS3"
FILE_NAME = "GGMES_100V08_SHB.DAT"
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 512
FILE_RECORDS = 812736
^SHBDR_HEADER_TABLE = ("GGMES_100V08_SHB.DAT",1)
^SHBDR_NAMES_TABLE = ("GGMES_100V08_SHB.DAT",2)
^SHBDR_COEFFICIENTS_TABLE = ("GGMES_100V08_SHB.DAT",162)
^SHBDR_COVARIANCE_TABLE = ("GGMES_100V08_SHB.DAT",322)
INSTRUMENT_HOST_NAME = "MESSENGER"
TARGET_NAME = "MERCURY"
INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM"
DATA_SET_ID = "MESS-H-RSS/MLA-5-SDP-V1.0"
OBSERVATION_TYPE = "GRAVITY FIELD"
ORIGINAL_PRODUCT_ID = "HGM008.SHB"
PRODUCT_ID = "GGMES_100V08_SHB"
PRODUCT_RELEASE_DATE = 2019-03-15
DESCRIPTION = "This file contains coefficients
and related data for a spherical harmonic model of the Hermean
gravity field. Input data are from radio tracking of the MErcury
Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER)
spacecraft. This product is a set of binary tables:
a header table, a names table, a coefficients table, and a
covariance table. Definitions of the tables follow. This
MESSENGER Mercury gravity model is in the form of a Spherical
Harmonics Binary Data Record (SHBDR). It has been produced by
the MESSENGER Radio Science at NASA GSFC, and extends to degree
and order 100. A Kaula rule of 4.0E-05/L^2 was applied.
All the MESSENGER tracking data, up to the end of mission
(April 30, 2015) are included in this solution.
Reference radius = 2440.0 km
The pole orientation and spin period were
adjusted during the gravity solution.
Pole orientation (right ascension and declination at J2000):
RA = 281.0082 degrees
DEC = 61.4164 degrees
Spin rate = 6.138505441 degrees/day .
The prime meridian and secular terms in RA/DEC were not adjusted.
Prime meridian = 329.7500 degrees (at J2000)
RA rate = -0.0328 degree/century
DEC rate = -0.0049 degree/century
The citation for this model is GENOVAETAL2019."
START_TIME = 2008-01-07
STOP_TIME = 2015-04-30
PRODUCT_CREATION_TIME = 2019-03-15
PRODUCER_FULL_NAME = "ANTONIO GENOVA"
PRODUCER_INSTITUTION_NAME = "GODDARD SPACE FLIGHT CENTER"
PRODUCER_ID = "MESSENGER RS TEAM"
SOFTWARE_NAME = "VCE"
OBJECT = SHBDR_HEADER_TABLE
ROWS = 1
COLUMNS = 9
ROW_BYTES = 56
INTERCHANGE_FORMAT = BINARY
DESCRIPTION = "The SHBDR Header includes
descriptive information about the spherical harmonic
coefficients which follow in SHBDR_COEFFICIENTS_TABLE.
The header consists of a single record of nine data
columns requiring 56 bytes. The Header is followed by
a pad of binary integer zeroes to ensure alignment
with RECORD_BYTES."
OBJECT = COLUMN
NAME = "REFERENCE RADIUS"
DATA_TYPE = IEEE_REAL
START_BYTE = 1
BYTES = 8
UNIT = "KILOMETER"
DESCRIPTION = "The assumed reference
radius of the spherical planet."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "CONSTANT"
DATA_TYPE = IEEE_REAL
START_BYTE = 9
BYTES = 8
UNIT = "N/A"
DESCRIPTION = "For a gravity field model
the gravitational constant GM in km cubed per seconds
squared for the planet. For a topography model, set to 1"
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "UNCERTAINTY IN CONSTANT"
DATA_TYPE = IEEE_REAL
START_BYTE = 17
BYTES = 8
UNIT = "N/A"
DESCRIPTION = "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."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "DEGREE OF FIELD"
DATA_TYPE = MSB_INTEGER
START_BYTE = 25
BYTES = 4
UNIT = "N/A"
DESCRIPTION = "Degree of the model field."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "ORDER OF FIELD"
DATA_TYPE = MSB_INTEGER
START_BYTE = 29
BYTES = 4
UNIT = "N/A"
DESCRIPTION = "Order of the model field."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "NORMALIZATION STATE"
DATA_TYPE = MSB_INTEGER
START_BYTE = 33
BYTES = 4
UNIT = "N/A"
DESCRIPTION = "The normalization indicator.
For gravity field:
0 coefficients are unnormalized
1 coefficients are normalized
2 other."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "NUMBER OF NAMES"
DATA_TYPE = MSB_INTEGER
START_BYTE = 37
BYTES = 4
UNIT = "N/A"
DESCRIPTION = "Number of valid names in
the SHBDR Names Table. Also, the number of valid
coefficients in the SHBDR Coefficients Table."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "REFERENCE LONGITUDE"
POSITIVE_LONGITUDE_DIRECTION = "EAST"
DATA_TYPE = IEEE_REAL
START_BYTE = 41
BYTES = 8
UNIT = "DEGREE"
DESCRIPTION = "The reference longitude for
the spherical harmonic expansion; normally 0."
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "REFERENCE LATITUDE"
DATA_TYPE = IEEE_REAL
START_BYTE = 49
BYTES = 8
UNIT = "DEGREE"
DESCRIPTION = "The reference latitude for
the spherical harmonic expansion; normally 0."
END_OBJECT = COLUMN
END_OBJECT = SHBDR_HEADER_TABLE
OBJECT = SHBDR_NAMES_TABLE
ROWS = 10197
COLUMNS = 1
ROW_BYTES = 8
INTERCHANGE_FORMAT = BINARY
DESCRIPTION = "The SHBDR Names Table
contains names for the solution parameters (including
gravity field coefficients) which will follow in
SHBDR_COEFFICIENTS_TABLE. The order of the names
in SHBDR_NAMES_TABLE corresponds identically to the
order of the parameters in SHBDR_COEFFICIENTS_TABLE.
Each coefficient name is of the form Cij or Sij
where i is the degree of the coefficient and j is
the order of the coefficient. Both indices are three-
digit zero-filled right-justified ASCII character strings
(for example, C010005 for the 10th degree 5th order C
coefficient, or S002001 for the 2nd degree 1st order
S coefficient). The eighth byte in the table is an
ASCII blank used to ensure that the row length
is equal to RECORD_BYTES. Names of other solution
parameters are limited to 8 ASCII characters; if less
than 8, they will be left-justified and padded with
ASCII blanks. The Names Table itself will be padded
with ASCII blanks, if necessary, so that its length is
an integral multiple of RECORD_BYTES."
OBJECT = COLUMN
NAME = "PARAMETER NAME"
DATA_TYPE = CHARACTER
START_BYTE = 1
BYTES = 8
UNIT = "N/A"
DESCRIPTION = "The name of the
coefficient or other solution parameter, left-
justified and padded with ASCII blanks (if needed)
to 8 characters."
END_OBJECT = COLUMN
END_OBJECT = SHBDR_NAMES_TABLE
OBJECT = SHBDR_COEFFICIENTS_TABLE
ROWS = 10197
COLUMNS = 1
ROW_BYTES = 8
INTERCHANGE_FORMAT = BINARY
DESCRIPTION = "The SHBDR Coefficients Table
contains the coefficients and other solution parameters
for the spherical harmonic model. The order of the
coefficients in this table corresponds exactly to the
order of the coefficient and parameter names in
SHBDR_NAMES_TABLE. The SHBDR Coefficients Table will be
padded with double precision DATA_TYPE zeroes so that
its total length is an integral multiple of RECORD_BYTES."
OBJECT = COLUMN
NAME = "COEFFICIENT VALUE"
DATA_TYPE = IEEE_REAL
START_BYTE = 1
BYTES = 8
UNIT = "N/A"
DESCRIPTION = "A coefficient Cij or
Sij or other solution parameter as specified in the
SHBDR Names Table."
END_OBJECT = COLUMN
END_OBJECT = SHBDR_COEFFICIENTS_TABLE
OBJECT = SHBDR_COVARIANCE_TABLE
ROWS = 51994503
COLUMNS = 1
ROW_BYTES = 8
INTERCHANGE_FORMAT = BINARY
DESCRIPTION = "The SHBDR Covariance Table
contains the covariances for the spherical harmonic model
coefficients and other solution parameters. The order of
the covariances in this table is defined by the product
of the SHBDR Names Table with its transpose, except that
redundant terms are omitted on their second occurrence.
The SHBDR Covariance Table will be padded with double
precision DATA_TYPE zeroes so that its total length is
an integral multiple of RECORD_BYTES."
OBJECT = COLUMN
NAME = "COVARIANCE VALUE"
DATA_TYPE = IEEE_REAL
START_BYTE = 1
BYTES = 8
UNIT = "N/A"
DESCRIPTION = "The covariance value
for the coefficients and other solution parameters
specified by the product of SHBDR_NAMES_TABLE with
its transpose, after omitting redundant terms."
END_OBJECT = COLUMN
END_OBJECT = SHBDR_COVARIANCE_TABLE
END