HST Keyword Dictionary

Space Telescope Science Institute

3700 San Martin Drive

Baltimore, MD 21212

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Keyword Definitions for the

This is version 11.4, dated 16-NOV-1987

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ASA_FILE
area scan analog is present 
Datatype: LOGICAL*1           
Units:

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ASD_FILE
area scan digital is present 
Datatype: LOGICAL*1           
Units:

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ASK_FILE
analog sky science is present 
Datatype: LOGICAL*1           
Units:

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AST_FILE
analog star science is present 
Datatype: LOGICAL*1           
Units:

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DSK_FILE
digital sky science is present 
Datatype: LOGICAL*1           
Units:

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DST_FILE
digital star science is present 
Datatype: LOGICAL*1           
Units:

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THRESH
PAD threshold setting for the object detector 
Datatype: INTEGER*4           
Units:
detector:

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VDATAFMT
Format of current observation 
Datatype: CHARACTER*04        
Units:
1: byte, 2: word, 3: longword, 4: analog 7: all

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VFAPVECX
x cmp apt vct f/ tav 
Datatype: INTEGER*4           
Units:
the home position of the image. The vector is set by the user with a default of 0. It can be used to point from a small observing aperture to the center of the finding aperture image. (norton.51)

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VFAPVECY
y cmp apt vct f/ tav 
Datatype: INTEGER*4           
Units:
the home position of the image. The vector is set by the user with a default of 0. It can be used to point from a small observing aperture to the center of the finding aperture image. (norton.51)

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VFCENVEX
x cmp trg ct vct tav 
Datatype: INTEGER*4           
Units:
points from the coarse target to the centroid of the target's individual measurements. (norton.52)

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VFCENVEY
y cmp trg ct vct tav 
Datatype: INTEGER*4           
Units:
points from the coarse target to the centroid of the target's individual measurements. (norton.52)

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VFCTVECX
x cmp crs trg vt tav 
Datatype: INTEGER*4           
Units:
The vector points from the center of the finding aperture image to the row and column representing the candidate. (norton.51)

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VFCTVECY
y cmp crs trg vt tav 
Datatype: INTEGER*4           
Units:
The vector points from the center of the finding aperture image to the row and column representing the candidate. (norton.51)

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VFFTVECX
x cmp fn trg vct tav 
Datatype: INTEGER*4           
Units:
This is the fine target vector, representing the sum of VFCENVE and VFCTVEC. (norton.52)

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VFFTVECY
y cmp fn trg vct tav 
Datatype: INTEGER*4           
Units:
This is the fine target vector, representing the sum of VFCENVE and VFCTVEC. (norton.52)

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VFOBJCNT
count of trg obj 
Datatype: INTEGER*4           
Units:
Gives the total number (in the range between VFLOFLIM and VFHIFLIM) of Target Acquisition and Verification objects found. Only the brightest 20 are saved, although this count could exceed that number. (norton.50)

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VFOCUSD
focus command value for object detector 
Datatype: INTEGER*4           
Units:

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VFPFACTX
tav vct cnv fctr - x 
Datatype: INTEGER*4           
Units:
These constants define the conversion between the TAV image scale and the scale of the image projected by the Space Telescope on the face of the detector. (norton.47)

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VFPFACTY
tav vct vnv fctr - y 
Datatype: INTEGER*4           
Units:
These constants define the conversion between the TAV image scale and the scale of the image projected by the Space Telescope on the face of the detector. (norton.47)

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VFSLWVEX
x cmp slew vct tav 
Datatype: INTEGER*4           
Units:
This is the vector issued as a slew request. It represents the vector sum of VFFTVEC and VFAPVEC, and points from the desired observing aperture to the centroid of the target's inidivual measurements. (norton.52)

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VFSLWVEY
y cmp slew vct tav 
Datatype: INTEGER*4           
Units:
This is the vector issued as a slew request. It represents the vector sum of VFFTVEC and VFAPVEC, and points from the desired observing aperture to the centroid of the target's inidivual measurements. (norton.52)

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VGAIND
gain setting of detector 1 
Datatype: INTEGER*4           
Units:
Gain setting of the object or sky depending on data source. (cgpsdh)

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VGAINDS
gain setting of detector "sky" 
Datatype: INTEGER*4           
Units:
See VGAINDn.

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VHIVOLT1
high voltage setting for detector 1 
Datatype: INTEGER*4           
Units:

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VHIVOLT2
high voltage setting for detector 2 
Datatype: INTEGER*4           
Units:

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VHIVOLT3
high voltage setting for detector 3 
Datatype: INTEGER*4           
Units:

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VHIVOLT4
high voltage setting for detector 4 
Datatype: INTEGER*4           
Units:

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VHIVOLT5
high voltage setting for detector 5 
Datatype: INTEGER*4           
Units:

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VHIVOLTS
high voltage setting for detector "sky" 
Datatype: INTEGER*4           
Units:

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VHORIZ
commanded horizontal deflection of obj detector 
Datatype: INTEGER*4           
Units:

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VHORSTPT
no. of horiz steps/spatial point in area scans 
Datatype: INTEGER*4           
Units:
Deflection steps correspond to about 4.42 microns on the face of the image dissector tube. If the incrementing process (starting with the initial deflection) causes the deflection value to exceed the 12-bit capacity (4096), the counter wraps and starts over at zero. (Norton.33)

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VHPOINTS
no. of horiz points (columns) in area scans 
Datatype: INTEGER*4           
Units:

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VNOINTPT
no. of integrations/pt in area scans 
Datatype: INTEGER*4           
Units:
Number of integrations to be done at each of the points in an area scan. the default value for this parameter after initialization is 1. (norton.33)

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VOLTAGE
commanded high voltage setting of obj detector 
Datatype: INTEGER*4           
Units:

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VPADTHR1
PAD threshold setting for detector 1 
Datatype: INTEGER*4           
Units:

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VPADTHR2
PAD threshold setting for detector 2 
Datatype: INTEGER*4           
Units:

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VPADTHR3
PAD threshold setting for detector 3 
Datatype: INTEGER*4           
Units:

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VPADTHR4
PAD threshold setting for detector 4 
Datatype: INTEGER*4           
Units:

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VPADTHR5
PAD threshold setting for detector 5 
Datatype: INTEGER*4           
Units:

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VPADTHRS
PAD threshold setting for detector "sky" 
Datatype: INTEGER*4           
Units:

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VREQDET
requested detector for the object observation 
Datatype: CHARACTER*08        
Units:
1: IDT1 (Image Dissector Tube 1) 2: IDT2 (Image Dissector Tube 2) 3: IDT3 (Image Dissector Tube 3) 4: IDT4 (Image Dissector Tube 4) 5: PMT (Photomultiplier)

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VSKYDET
currently selected sky detector 
Datatype: CHARACTER*08        
Units:
1: IDT1 (Image Dissector Tube 1) 2: IDT2 (Image Dissector Tube 2) 3: IDT3 (Image Dissector Tube 3) 4: IDT4 (Image Dissector Tube 4) 5: PMT (Photomultiplier)

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VVERSTPT
no. of vert. steps/spatial pt. in area scans 
Datatype: INTEGER*4           
Units:
Deflection steps correspond to about 4.42 microns on the face of the image dissector tube. If the incrementing process (starting with the initial deflection) causes the deflection value to exceed the 12-bit capacity (4096), the counter wraps and starts over at zero. (Norton.33)

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VVERT
commanded vertical deflection of obj detector 
Datatype: INTEGER*4           
Units:
Equivalent to VVERTn for when the object detector=n. (cgpulk)

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VVERTn
Vertical deflection for detector 1 
Datatype: INTEGER*4           
Units:
Sets the 12bit DAC which determines the initial vertical image dissector tube deflection current. (norton.35)

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VVPOINTS
no. of vertical points (rows) in area scans 
Datatype: INTEGER*4           
Units:

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HST Keyword Dictionary: 3/15/94: (rose@stsci.edu)