FOS Instrument Science Report 097

"Light Loss in FOS as a Function of Pointing Error"
by R. C. Bohlin

Abstract excerpted from the report:
	Target acquisition errors in acquiring point source targets cause a
	loss in FOS spectra.  Several sets of peak-up acqusitions are analyzed
	for the most commonly used apertures: A1 (4.3"), B3 (1"), B2 (0.3"),
	and the 0.25" wide slit.  The fall-off signal is gradual except when 
	the target is within about 0.1" of the edge of the qperture.  As
	expected, the light loss is roughly 50% when the target lies on the 
	aperture edge.


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