FOS Instrument Science Report 123

"SMOV Report V: FOS Plate Scale and Orientation"
by A. Koratkar, T. Wheeler, I. Evans, O. Lupie, C. Taylor, C. Keyes,
and A. Kinney

Abstract excerpted fromt he report:
	Plate scale factors for the FOS blue and red detectors are measured
	for the first time after COSTAR installation from the SMOV proposal ID 
	number 5626 data.  The analysis indicates that the scale factors are
	1.258" plus or minus 0.014" per diode height and 0.031 plus or minus
	0.004" per diode width for the blue detector.  The SMOV predictions
	were 1.232" per diode height and 0.305" per diode width for the blue
	detector and 1.232" per diode height and 0.304" per diode width for
	the red detector.  The plate scales are not identical in the FOS X and
	Y directions because of the asymmetric magnification in the COSTAR X, Y
	meridional axes.

	Mean rotation angles of 170.78 degrees and 98.94 are measured between
	the nominal FOS Y axis and V3 axis for the blue and red detectors
	respectively.  The PDB will be updated after the results of the 
	engineering tests determine the YPITCH value for each of the detectors.




For more information, please contact the above authors.