THE POST COSTAR ROTATION MATRICES FOR
CALCULATING V2, V3 OFFSETS IN MODE 2 FOS TARGET ACQUISITION


INSTRUMENT SCIENCE REPORT CAL/FOS-092


A.P. KORATKAR AND 0. LUPJE

APRIL 1993


INTRODUCTION


The Post co-star rotation tnatrices YFMTRXA and YFMTRXB used to
deterinine the V2, V3 offsets are caldulated. The rotation matrices
transform from the FOS coordinates, at the EOS detector photo cathode,
to the telescope V2, V3 coordinates. The rotation niatrices are used
to determine FOS offsets din-ing binaxy search and firmware modes. The
values in the matrices will change after tbe repair mission due to the
change in FOS plate scale and the change in the angle between FOS X, Y
co-ordinate axes with respect to the V2, V3 axes.