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The Uppsala General Catalogue of Galaxies (UGC) is a catalogue of 12,921 
The catalogue includes essentially all galaxies north of
galaxies
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...
visible from the northern hemisphere. It was first published in 1973.
The catalogue includes essentially all galaxies north of declination
In astronomy, declination (abbreviated dec; symbol ''δ'') is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. Declination's angle is measured north or south of the ...
-02°30' and to a limiting diameter of 1.0 arcminute or to a limiting apparent magnitude of 14.5. The primary source of data is the blue prints of the Palomar Observatory Sky Survey (POSS). It also includes galaxies smaller than 1.0 arcminute in diameter but brighter than 14.5 magnitude from the Catalogue of Galaxies and of Clusters of Galaxies (CGCG).
The catalogue contains descriptions of the galaxies and their surrounding areas, plus conventional system classifications and position angles for flattened galaxies. Galaxy diameters are included and the classifications and descriptions are given in such a way as to provide as accurate an account as possible of the appearance of the galaxies on the prints. The accuracy of coordinates is only what is necessary for identifications purposes.
Addendum
There is an addendum to the catalogue called Uppsala General Catalogue Addendum which is abbreviated as UGCA.See also
* :UGC objects * Uppsala * Uppsala Astronomical Observatory * Royal Society of Sciences in UppsalaReferences
Astronomical catalogues of galaxies * 1973 documents 1973 in science External linksUGC - Uppsala General Catalog of Galaxies
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