12.5.3 WFC3 Coordinate System
WFC3 is located on-axis in the focal plane of HST. This article shows how the detector reference frame compares to HST's U2, U3 reference frame.
Boldface type indicates the name of an APT parameter or a value for a parameter.
Black text indicates an important note.
Magenta text indicates available but unsupported parameters (requires prior approval from STScI).
Red text indicates restricted parameters (for STScI use only).
Brown text indicates text file parameters.
Items in brackets - <value> - are required values.
Items in square brackets - [<value>] - are optional.
Figures 12.1 and 12.2 illustrate the locations of the UVIS and IR apertures. In the figures, the outlines of the full-detector apertures of both the UVIS and IR channels are indicated, as projected onto the sky and with respect to the HST U2-U3 coordinate system.