----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
EARTH 0 20 20 3.986004359D+14 6378144.11 298.255
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-5 A5 EARTH - Modifies the earth's
gravitational potential and/or
introduces new earth constants.
7 I1 Gravity model initalization indicator. 0
= 0 Gravitational coefficients are
initialized from gravity model file.
They may be changed by GCOEF, GCOEFC
or GCOEFS cards.
> 0 Gravitational coefficients are set
to zero except those which appear on
GCOEF, GCOEFC, or GCOEFS cards which
follow this card.
8 I1 Gravity model print control switch. 0
= 0 Print two portions of model:
1. lowest degree & order; and
2. highest degree & order.
= 1 Print entire gravity model. :
: N/A
= 2 Print only model checksum. :
9 I1 Indicator of the contents of the 0
remainder of this card:
= 0 Columns 25-72 contain the
values for GM, ae,1/fe.
= 1 Columns 25-72 contain the
sigmas for GM, ae, 1/fe.
JULY 1987
8704.0
GLOBAL SET
EARTH (cont)
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
15-17 I3 Maximum degree of coefficient to be 3
used in the gravitational model.
Minimum =3. Default depends on gravity
model file on unit 12.(See NOTES)
18-20 I3 Maximum order of coefficient to be 2
used in the gravitational model.
minimum =2. Default depends on
gravity model file on unit 12.
25-44 D20.8 Universal gravitational constant 3.9860064D14 M**3/S**2
times the mass of the Earth (GMe)
or sigma value if column 9 =1
45-59 D15.3 Semi-major axis of the Earth (Ae) or 6378138.0 M
sigma value if column 9 =1
60-72 D13.1 Inverse of the Earth's flattening 298.255
(1/fe) or sigma value if column 9 =1
NOTES:
[1] The default values for degree and order of the gravity field and
the Earth constants are overridden by the values from the gravity
model file on unit 12.
[2] EARTH and PLANET are actually the same keyword card except that
EARTH automatically supplies the planet number (0300) and does not
have planetary position adjustment capability.
UNITS: KM =Kilometers; M =Meters ; S =Seconds ; M/S=Meters per second
IF CARD OMITTED: The complete geopotential field contained in
the default gravity model file on UNIT 12 will be used.
AUG 1985
8507.0
GLOBAL SET