Calibrating the WFPC2 astrometry for MDS
Ratnatunga, K. U., Ostrander, E. J. & Griffiths, R. E.
Carnegie Mellon University, Pittsburgh, PA 15213, USA
The 1997 HST Calibration Workshop with a New Generation of Instruments
Space Telescope Science Institute, Baltimore, MD, USA
1997 September 22-24,
Stefano Casertano, Robert Jedrzejewski, Charles Keys, and Mark Stevens
Space Telescope Science Institute, Baltimore, Maryland, 1997.
QB500.XXX .CXX 1997.
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.
Full paper available in