80,000 stars an hour

Details 80,000 stars an hour 80,000 stars an hour

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980s%26t....59...16h&link_type=abstract

Sky and Telescope, vol. 59, Jan. 1980, p. 16, 17.

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Applications

1

Astronomical Observatories, Astronomical Photography, Automation, Photointerpretation, Laser Applications, Sky Surveys (Astronomy), Telescopes

Scientific paper

The Automated Plate Scanner (mated to a minicomputer and a microprocessor controller) can scan two 14 sq in. Palomar Sky Survey plates simultaneously in about 2.5 h, reading the positions of 100,000 stars on each photographic plate with a positional accuracy of about 1 micron. Light from a helium-neon laser passes through a 2,250 rpm rotating eight-sided prism to the plates and is focused on a photomultiplier tube, then processed by means of a threshold detector. With an interactive data-reduction system (including an image-processor) uses of the Scanner, other than proper-motion measurement, include processing both circular and comatic star images, one-dimensional and echelle spectrograms, and extended objects; subtracting background light, and comparing optical plates with VLA radio 'plates'. Other possible applications include photographic photometry of stars in clusters and galaxies and surveys for emission-line objects.

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