"Guide to Minor Body Astrometry," Internet article at http://cfa-www.har-vard.edu/iau/info/astrometry.html. Description of how to carry out measurements and report observations of asteroids: "This guide is intended for those observers interested in undertaking an astrometric CCD-observing program of minor planets and/or comets."
Everhart, Edgar. "Constructing a Measuring Engine." Sky and Telescope (September 1982): 279. Describes building a two-axis precision engine for measuring positions from photographs; great insight into state of the art of amateur astrometry before CCDs.
Konig, A. "Astrometry with Astrographs." In Astronomical Techniques. Ed. W.A. Hiltner. Chicago: University of Chicago Press, 1962. Quite possibly the clearest exposition of astrometry available; appears in a short chapter of an impeccable source book on astronomy.
Marché, Jordan D., II. "Measuring Positions on a Photograph." Sky and Telescope (July 1990): 71. Instructions for doing astrometry from photographic prints; includes program in line-numbered Basic for reducing (x, y) data using the plate-constants method.
Marsden, Brian. "How to Reduce Plate Measurements." Sky and Telescope (September 1982): 284. A one-page article outlining the equations necessary to solve for plate constants and positions.
Montenbruck, Oliver, and Thomas Pfleger. "Astrometry." In Astronomy on the Personal Computer. New York: Springer-Verlag, 1991. An exceptionally clear exposition of astrometry with an accompanying program in Pascal for performing astrometric reductions.
Podobed, V.V. Fundamental Astrometry. Chicago: University of Chicago Press, 1964. Despite hideous typesetting and muddy photographs, this is an excellent book for would-be astrometrists. It covers all aspects of the field (circa 1960) including meridian circle work and the photographic zenith tube.
Taff, Laurence G. Computational Spherical Astronomy. New York: Wiley-In-terscience, 1981. This work addresses techniques for astrometry on rapidly moving objects and images captured on multiple plates— fast-moving asteroids and comets.
Van de Kamp, Peter. Principles of Astrometry. San Francisco: W.H. Freeman, 1967. Written by one of the foremost astrometrists, this classic work focuses on astrometry with long-focus refractors. The methods described are readily applicable to modern CCD astrometry.
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.