FOS Instrument Science Report #116

"SMOV Report I: Location of Spectra"
by Anuradha Koratkar, Cynthia Taylor, Anne Kinney and Charles (Tony) Keyes

Abstract excerpted from the report:
	The optimal Y locations of the FOS spectra were determined for all
	non-polarized grating/detector combinations and the mirror using 
	calibration maps obtained during SMOV (proposal ID 5243).  The last
	observation obtained to determine the location of spectra in Cycle 3
	showed a jump of 22 Ybase units for nearly all the grating/detector
	combinations.  This ybase value was ~3 sigma from other values, and is
	likely due to filter grating wheel non-repeatability.  This is confirmed
	by the SMOV observations for most of the grating/detector combinations.
	The SMOV data show that the location of the spectrum follows the trends
	seen in the Cycle 1 and Cycle 2 data.  The trends seen in the data 
	cannot be easily characterized.  Hence, it is recoommend that the 
	location of spectra be monitored several times per cycle and the Project
	Data BAse (PDB) updated as required.  YBASE values in the PDB were up-
	dated on December 17, 1993.




For more information, please contact the above authors.