Title:
 Calibrating the WFPC2 astrometry for MDS
Authors:
 Ratnatunga, K. U., Ostrander, E. J. & Griffiths, R. E.
Institution:
 Carnegie Mellon University, Pittsburgh, PA 15213, USA
Proceedings:
 The 1997 HST Calibration Workshop with a New Generation of Instruments
Workshop:
 Space Telescope Science Institute, Baltimore, MD, USA
Date:
 1997 September 22-24,
Editors:
 Stefano Casertano, Robert Jedrzejewski, Charles Keys, and Mark Stevens
Publisher:
 Space Telescope Science Institute, Baltimore, Maryland, 1997.
LC #:
 QB500.XXX .CXX 1997.
Pages:
 361-367

Abstract

The Hubble Space Telescope (HST) Medium Deep Survey has optimized an automated procedure to associate and stack WFPC2 data. The coordinates listed in HST WFPC2 image and/or jitter file headers are often found to be insufficient to stack images for cosmic ray removal. We discuss results from software developed for the HST Medium Deep Survey (MDS) pipeline to evaluate these shifts by cross-correlation of the images. We will also discuss the distortion of the pre-cool-down WFPC2 field and attempts to derive absolute coordinates for MDS WFPC2 observations using the USNO-Al.0 half billion object catalog.

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