The Wide Field Camera 3 (WFC3) is the latest imager built for the Hubble Space Telescope (HST) and is planned to replace the Wide Field Planetary Camera 2 (WFPC2) in the next servicing mission to the HST. WFC3 (see Fig. 1) is configured as a two-channel instrument . The UVIS channel provides diffraction limited imaging from the 2000 A to ~1 ^m and uses two large format e2v CCD43 4Kx2K CCD devices optimized for near-UV sensitivity. The IR channel is optimized for the 0.8-1.7 ^m region. It
uses a HgCdTe focal plane from Rockwell Scientific Company (RSC) with long wavelength cutoff at 1.7 ^m. The detector, operating at 150 K, is hybridized on a HAWAII-1R multiplexer providing 1024x1024 pixels of 18 ^m pitch, including 5 outer rows and columns of reference pixels.
In September 2004 WFC3 successfully conducted a thermal vacuum performance characterization test at the Detector Characterization Laboratory (DCL) of the NASA Goddard Space Flight Center (GSFC). Its installation on the HST is contingent upon authorization of shuttle-based servicing of HST after a successful return-to-flight.
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