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We describe recent orbital test data acquired with the COSTAR/Faint Object Spectrograph(FOS) on the Hubble Space Telescope(HST). These data exhibit possible internal thruput deficit and scattering features in the FOS. We next use a theoretical model to simulate some of the HST/COSTAR/FOS imaging and spectral performance. We apply the model to the current data to assist in evaluating COSTAR imaging performance, and to attempt to isolate the origin of the thruput deficit and scattering features. The results of these studies will permit a better understanding of the limits of HST performance and permit development of optimal strategies for performing spatially resolved spectroscopy in the FOS scientific observing program.
