From: Linda Dressel <dressel@stsci.edu>
Date: Tuesday, July 17, 2012 2:08 PM
To: John Mackenty <mackenty@stsci.edu>, Larry Petro <petro@stsci.edu>,
Denise Taylor <dctaylor@stsci.edu>
Cc: Linda Dressel <dressel@stsci.edu>, Shireen Gonzaga <shireen@stsci.edu>,
Warren Hack <hack@stsci.edu>, Andrew Fruchter <fruchter@stsci.edu>,
Jennifer Mack <mack@stsci.edu>
Subject: Re: WFC3 and single star guiding
The answer for WFC3 is the same as for WFPC2, since both are/were centrally
located in the HST FOV:
The rarely seen maximal roll rate about a single guide star results in a shift of
~50 mas on either WFC3 detector in one orbit. The typical roll rate about a single
guide star results in a shift of ~15 mas on either WFC3 detector in one orbit.