Astronomische Gesellschaft Katalog
The Astronomische Gesellschaft Katalog (AGK) is an astrometric star catalogue. Compilation for the first version, AGK1, was started in 1861 by Friedrich Argelander and published between 1890 and 1954, listing 200 000 stars down to ninth magnitude.
The third version, AGK3, was started in 1956 and published in 1975. It contains 183,145 stars north of declination –2° with mean positional errors of ±0.13" and mean proper motion errors of ±0.009"/year.
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