Quality of Plate Copies Digitized with a Commercially Available Scanner

Details Quality of Plate Copies Digitized with a Commercially Available Scanner Quality of Plate Copies Digitized with a Commercially Available Scanner

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20515303s&link_type=abstract

American Astronomical Society Meeting 205, #153.03; Bulletin of the American Astronomical Society, Vol. 36, p.1602

Astronomy and Astrophysics

Astronomy

Scientific paper

Digitization of all the (ca. 8,000) 8"x10" plates of the Maria Mitchell Observatory's plate collection with the commercially available scanner AgfaScan T5000 took about 1.5 years. Scanning these plates with the same nominal resolution (10-20 microns) using one of the best astronomical digital microdensitometers would be about 8 times longer, and, correspondingly, 8 times more expensive. Such a fast job may raise doubts in the quality of the scans. We show, by comparison with the control scans obtained with the STScI's GAMMA laser microdensitometer, that the additional random errors for stellar photometry introduced by AgfaScan T5000 are, typically, less than 0.05 mag, and that this scanner does not produce any detectable additional astrometric errors. This project was supported by the NSF/REU grant AST-0354056 and the Nantucket Maria Mitchell Association.

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