HST Keyword Dictionary

Space Telescope Science Institute

3700 San Martin Drive

Baltimore, MD 21212

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Keyword Definitions for the

dated 14-APR-94

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VXMOON
Moon velocity: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM/SEC
Velocity of Moon in x-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

VXSUN
Sun velocity: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM/SEC
Velocity of Sun in x-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

VYMOON
Moon velocity: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM/SEC
Velocity of Moon in y-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

VYSUN
Sun velocity: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM/SEC
Velocity of Sun in y-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

VZMOON
Moon velocity: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM/SEC
Velocity of Moon in z-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

VZSUN
Sun velocity: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM/SEC
Velocity of Sun in z-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

XMOON
Moon position: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM
Distance of Moon in x-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

XSUN
Sun position: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM
Distance of Sun in x-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

YMOON
Moon position: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM
Distance of Moon in y-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

YSUN
Sun position: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM
Distance of Sun in y-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

ZMOON
Moon position: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM
Distance of Moon in z-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

ZSUN
Sun position: geocentric J2000 frame 
Datatype: REAL*8              
Units:    KM
Distance of Sun in z-direction relative to earth center. Determined in advance of observation for time given by PSTRTIME.

Source : SCS

HST Keyword Dictionary: 14-APR-94: (rose@stsci.edu)