LONG TERM FOS CALIBRATION PLAN: CYCLE 1

CAL/FOS-062

A.L. Kiriney and G.F. Hartig
August, 1989


INTRODUCTION



The Fa.int Object SpecLrograph is one of the two most requested ST
instruments. Out of & total of 1581.5 bours of requests in high
priority accepted GO programs, there were requests for 478 hours of
FOS time, utilizing most of the vaiid instrument modes and
conflgurations. (FOS is running a. dose second to WF/PC, which was
requested for 590 hours.) lt is clear that the long term a.nd steady
state calibration of FOS will involve a major cornrnitment of
telescope time. The plan presented here includes all the calibrations
that we think are necessary for ma.inta.ining the level of calibration
achieved after Science Verification (5V) plus fundamental caiibrations
which were not done in SV due to time constraints. They are
prioritized according to the importance of the calibration. Tbis plan
requires 74.2 hours of spacecraft Lime; 42.1 for ma.intaixiing the
accuracies achieved in SV, and 32.1 hours for extending the
calibrations performed in SV.