The authors use a scanning CCD for acquisition and astrometry of new and recovered comets, asteroids, and other solar system objects. The Newtonian focus of a 91 cm telescope has been modified from f/5 to f/3.85 with a relay lens to give a plate scale of 1.73 arcsec per pixel, a scale chosen for efficient coverage of sky. A typical scan will cover 30 minutes of time in right ascension by 0.156 deg in declination and is stored as a digital array of 14848x320 CCD pixel signals. Several potential reference (SAO) stars are observed in one such scan. The reduction from pixel coordinates to apparent topocentric equatorial coordinates of date involves only three free parameters.
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Gehrels et al. (1986) studied this question.