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I/161 AGK3R (Smith 1990)
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agk3r.dat
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Beginning of ReadMe :I/161 AGK3R (Smith 1990)
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AGK3R Catalogue
Smith C. A. Jr.
<unpublished, 1990>
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ADC_Keywords: Positional data
Abstract:
A catalog of positions of reference stars distributed uniformly on the
celestial sphere north of declination -5 deg. contains meridian
observations of 21,499 stars with a mean epoch 1958.5. This catalog
was compiled from more than 300,000 observations made with 11 northern
meridian circles during the period 1956 to 1963. The observations are
on the FK4 system.
Introduction:
There is a need for reference catalogs with good modern positions.
Recently, positions were redetermined for Northern Hemisphere
reference stars to form the AGK3R catalog that was used to determine
the plate constants for the AGK3 Photographic Catalog (Dieckvoss
1975). The AGK3R catalog contains 21,499 stars evenly distributed on
the surface of the celestial sphere from -5 deg. to +90 deg. The
observations were made with 11 northern meridian circles during the
period 1956 to 1963. Stars were selected from two lists: one selected
at the U. S. Naval Observatory and the other at the Pulkovo
Observatory and the Sternberg Institute. The participating
observatories were Bergedorf, Bordeaux, Greenwich, Heidelberg,
Nicolaev, Ottawa, Paris, Pulkovo, Strasbourg, and the U. S. Naval
Observatory (Smith, 1980). Both the seven-inch and the six-inch
transit circles were employed at the U. S. Naval Observatory. All
observations were reduced on a nightly basis by the observers to the
FK3R system and, later to the FK4 either by the observer himself or at
the U.S. Naval Observatory.