The Photometric Performance of WFC3/IR: Temporal Stability Through Year 1

Details The Photometric Performance of WFC3/IR: Temporal Stability Through Year 1 The Photometric Performance of WFC3/IR: Temporal Stability Through Year 1

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011wfc..rept....8k&link_type=abstract

Instrument Science Report WFC3 2011-08, 9 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wfc3, Wide Field Camera 3

Scientific paper

We analyze multiple observations of four bright HST spectrophotometric standard stars obtained with WFC3/IR in order to establish the temporal stability of the instrument over its first 1.5 years of science operations. Observations of one or more of the four stars, P330E, GD 153, GD 71, and G191B2B were obtained at multiple dither positions near the center of the array, and in all 15 imaging filters. A number of different read out modes and subarray sizes were used to ensure that a very high signal-to-noise measurement of the star was obtained in each observation. The first data sets followed shortly after installation of WFC3 in HST in May 2009 and over two dozen epochs have been observed up to late 2010. Analysis of the over 1200 individual observations shows that point source photometry with WFC3/IR is temporally stable to more than 99%.

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