Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546309k&link_type=abstract
American Astronomical Society, AAS Meeting #215, #463.09; Bulletin of the American Astronomical Society, Vol. 42, p.496
Astronomy and Astrophysics
Astronomy
Scientific paper
During HST Servicing Mission 4 in May 2009, Wide Field Camera 3 (WFC3) replaced WFPC2. WFC3 is comprised of two channels, the UVIS channel, which contains two 2Kx4K- pixel CCD detectors, and an IR channel, which contains a 1Kx1K-pixel detector. During the WFC3 Servicing Mission Observatory Verification program we performed a preliminary calibration of WFC3's image distortion. Images of astronomical extended objects on the UVIS and IR detectors have 7% linear distortion,principally caused by the inclination of the camera focal planes to the telescope's principal rays. We determined the coordinate transformations between the sky and the WFC3 focal plane, which include distortion, rotation and translation. The transformation for each UVIS CCD is treated separately, whereas the monolithic IR detector requires only a single transformation. We acquired observations of astrometric fields in 47 Tuc and the LMC consisting of 30 UVIS F606W pointings and 24 IR F160W pointings. We find that a fourth order polynomial fits the optical distortion with residuals of 0.05 pixel (2 milliarcseconds) in the UVIS channel and 0.06 pixel (8 milliarcseconds) in the IR channel. Although these residuals contain systematic variations indicative of higher order polynomial terms and possibly filter-dependent, high-frequency distortion, the results reported here can be used to combine images, e.g. using STScI's MultiDrizzle application.
Bushouse Howard
Cox Catherine
Dressel Linda Lou
Hack Warren
Kozhurina-Platais Vera
No associations
LandOfFree
WFC3 - Geometry Distortion and Multidrizzle does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with WFC3 - Geometry Distortion and Multidrizzle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and WFC3 - Geometry Distortion and Multidrizzle will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-972279