GHRS Instrument Science Report 079

"Interpreting GHRS Target Positioning"

A. Schultz, J. Bacinski, and L. Sherbert

February 4, 1997

Abstract

Frequently asked questions by GHRS observers and archival researchers
include "Was the target acquired?" and, "How well centered was the
target in the aperture?" This ISR will address these two questions
using specific examples of successful and failed GHRS acquisitions.
Pre-COSTAR and Post-COSTAR acquisitions will be discussed. Included are
descriptions of other potential guiding and pointing problems and their
effect upon GHRS science observations.