Card 6t - ORBDEF5 Spacecraft Orientation Parameters

This optional card defines the spacecraft orientation parameters.

Parameter Value Description
ORBDEF5 ORBDEF5 or 45 mnemonic
ID Integer ID number
V1X real X component of vector1 in the global coordinate system
V1Y real Y component of vector1 in the global coordinate system
V1Z real Z component of vector1 in the global coordinate system
V2X real X component of vector2 in the global coordinate system
V2Y real Y component of vector2 in the global coordinate system
V2Z real Z component of vector2 in the global coordinate system
SATDIR 1 For ORBDEF4 ANOPT = LONGSAT, S/C is ascending at the LONGSAT position
2 For ORBDEF4 ANOPT = LONGSAT, S/C is descending at the LONGSAT position
SATLAT real S/C latitude (active for ORBDEF4 ANOPT = LONGSAT)
RASUN real Right ascension angle of the sun in degrees

V1X

V1X is the X coordinate of vector1 on ORBDEF1 in the global coordinate system.

V1Y

V1Y is the Y coordinate of vector1 on ORBDEF1 in the global coordinate system.

V1Z

V1Z is the Z coordinate of vector1 on ORBDEF1 in the global coordinate system.

V2X

V2X is the X coordinate of vector2 on ORBDEF1 in the global coordinate system.

V2Y

V2Y is the Y coordinate of vector2 on ORBDEF1 in the global coordinate system.

V2Z

V2Z is the Z coordinate of vector2 on ORBDEF1 in the global coordinate system.

SATDIR

SATDIR is the flag specifying whether the spacecraft is ascending or descending when ORBDEF4 ANOPT = LONGSAT. Otherwise, it should be 0.

SATLAT

SATLAT is the spacecraft latitude in degrees if ORBDEF4 ANOPT = LONGSAT. Otherwise, it should be 0.

RASUN

RASUN is the sun right ascension angle value in degrees if ORBDEF3 SOLOPT = SUNDECL for planets other than Earth (ORBDEF1 PNAME = EARTH). Otherwise, it should be 0.

The sun right ascension angle is the angle measured eastward from the Vernal equinox axis in the planet’s equatorial plane to the projection of the sun vector onto the equatorial plane.

The vernal equinox is the time when the apparent position of the sun crosses the equator moving from south to north. The vernal equinox axis is a line from the Earth's center to the point where the sun crosses the equator moving from South to North.