Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..299l&link_type=abstract
Astronomical Journal, vol. 82, Apr. 1977, p. 299-302. Research supported by the Estate of Leander J. McCormick
Astronomy and Astrophysics
Astronomy
1
Astrometry, Astronomical Photography, Displacement Measurement, Photographic Emulsions, Photographic Plates, Astronomical Spectroscopy, Comparators, Error Analysis, Photographic Processing
Scientific paper
The paper reports on a series of experiments in which photographic emulsion shifts were measured on 50 test plates developed under two different sets of conditions. The precision of the stellar comparator employed to examine the plates is determined by multiple measurements of 10 plates, and numerical results of the emulsion-shift measurements are presented for various emulsion types, plate sizes, and processing techniques. It is found that the image shifts are random to the precision of the experiment and are definitely correlated with emulsion type. It is suggested that the significant errors introduced in astrometric and spectroscopic results by emulsion shifts can be reduced by using multiple images and plates.
Ianna Philip A.
Levinson F. H.
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