Plate measurements and reductions at Muenster

Details Plate measurements and reductions at Muenster Plate measurements and reductions at Muenster

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asph.conf..245t&link_type=abstract

In Royal Observatory Astron. Phot. 1984 p 245-252 (SEE N85-16102 07-35)

Astronomy and Astrophysics

Astronomy

Astrometry, Astronomical Photography, Microdensitometers, Photographic Plates, Computer Systems Programs, Position Errors, Star Distribution

Scientific paper

A microdensitometer used with astronomical photography plates is described. Positional error derived from repeated measurements of a sharp edge is of the order of 0.1 microns with only small increases for scan speeds near the beginning and the end of the full scale from 0 to 226 mm/sec. Positional measurements of stars using Gauss fits to marginal distributions yield differences of 0.6 microns for different plate orientations. Differences with respect to catalog positions, using quadratic reduction models, yield a mean of 1.2 microns for well-exposed IIa-O plates with plate scales of 40 sec/mm and reference stars from the AGK3 corresponding to 0.05 sec for single measurements. Photometric accuracy for a typical multiplier voltage is 0.25% in density 3, 0.29% in transmission 1.

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