Astronomers' problems with the calibration of Schmidt plates

Details Astronomers' problems with the calibration of Schmidt plates Astronomers' problems with the calibration of Schmidt plates

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asph.conf..207f&link_type=abstract

In Royal Observatory Astron. Phot. 1984 p 207-217 (SEE N85-16102 07-35)

Astronomy and Astrophysics

Astronomy

Calibrating, Photographic Plates, Schmidt Cameras, Stellar Magnitude, Photographic Emulsions, Schmidt Telescopes

Scientific paper

Comparison of photographic aperture magnitudes from the PDS measurement of a sky-limited UK Schmidt plate J3721 with calibrated magnitudes for the stars in Hawkins' SGPG2 sequence revealed that the photographic magnitudes for faint stars are too bright. This discrepancy persists when the magnitudes are compared with similar results from the PDS measurement of a sky-limited AAT plate of the same area. Stars fainter than B20 are consistently estimated brighter when using the Schmidt plate than when using the AAT plate, giving a relative scale error of 0.1 mag/mag. It is not known if the problem is intrinsic to Schmidt plates.

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