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WFC3 Data Handbook V. 4.0 |
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1.2 Figure 1.2 shows a schematic of the UVIS channel aperture projected onto the sky with respect to the V2/V3 reference frame. (For definitions of the coordinate systems in the figure, please refer to Section 6.4.3 of the WFC3 Instrument Handbook.) The WFC3 optics cause the nominally square field of view of the UVIS detector to be projected onto the sky as a skewed rhombus, 162 arcsec on a side, with an angle of 86.1 degrees between the sides. This distortion affects both the photometric accuracy and astrometric precision of the UVIS images. For a thorough discussion of WFC3’s geometric distortion, we refer the reader to Chapter 4.