HST Phase 2 Target Coordinate Instructions

The HST reference frame is defined by the HST Guide Star Catalog (GSC) that STScI has created. For observations that require accurate coordinates, such as those using the spectrographs which have small apertures, it is very important that you provide positions derived in the same reference frame as the original GSC plate material. Except in special cases, you do not need to provide this level of sub-arcsecond accuracy for imaging observations.

General Guidelines

Check with your Program Coordinator for more details and/or exceptions


Brian McLean --- Last Updated May 2004
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