Photographic astrometry against a bright sky - Theory and application

Details Photographic astrometry against a bright sky - Theory and application Photographic astrometry against a bright sky - Theory and application

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83.1227h&link_type=abstract

Astronomical Journal, vol. 83, Oct. 1978, p. 1227-1234. Research supported by the University of Texas

Astronomy and Astrophysics

Astronomy

1

Astronomical Photography, Daytime, Gravitational Effects, Sky Brightness, Astrometry, Light Scattering, Photographic Plates, Signal Detection

Scientific paper

Theoretical, experimental, and statistical arguments are given to demonstrate that daytime astrometry can be a viable technique in some circumstances. In particular, a scheme is outlined for a daytime observation of the gravitational deflection of light by the sun. Detailed examination of the photographic astrometry approach shows that the accuracy expected from a single plate exposed to a star field about the sun is expressible in terms of the uncertainties with which the positions of the images are determined. An experimental determination is performed, yielding the astrometric positional accuracy as a function of the magnitude of the star, the brightness of the background, and the sensitivity of the measurement process. This result is extrapolated to the light-deflection configuration by using measurements of sky brightness as a function of observer altitude and the angular separation of the observed region of sky from the sun. Application to star fields along the ecliptic indicates an expected accuracy of 1% to be attainable from 85 to 200 plates.

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