Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasp..115..113a&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 803, pp. 113-131.
Astronomy and Astrophysics
Astronomy
74
Astrometry, Instrumentation: Detectors
Scientific paper
Having an accurate distortion correction is critical to doing accurate astrometry with the Wide Field Planetary Camera 2. Currently available solutions have serious systematic errors (~0.2 pixel) of a skewing nature in their linear terms. We use the inner calibration field of ω Centauri to find an improved cubic solution that is accurate to +/-0.01 pixel in the WF chips and to +/-0.02 pixel in the PC chip. Improvements beyond this will be difficult, as there are many factors that perturb the solution at the ~0.01 pixel level: breathing, variations with filter, and the physical movement of the chips. There are probably not enough data available to constrain the solution to better than ~0.01 pixel. Nevertheless, our solution is a major improvement and will allow many astrometric projects to obtain near-optimal results. Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.
Anderson Jeffrey
King Ivan R.
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