Uppsala General Catalogue
Encyclopedia
The Uppsala General Catalogue of Galaxies (UGC) is a catalogue of 12921 galaxies
visible from the northern hemisphere. It was published the first time in 1973.
The catalogue includes essentially all galaxies north of declination
-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.
Galaxy
A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark matter. The word galaxy is derived from the Greek galaxias , literally "milky", a...
visible from the northern hemisphere. It was published the first time in 1973.
The catalogue includes essentially all galaxies north of declination
Declination
In astronomy, declination is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Declination in astronomy is comparable to geographic latitude, but projected onto the celestial sphere. Declination is measured in degrees north and...
-02°30' and to a limiting diameter of 1.0 arcminute or to a limiting apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of 14.5. The primary source of data is the blue prints of the Palomar Observatory
Palomar Observatory
Palomar Observatory is a privately owned observatory located in San Diego County, California, southeast of Pasadena's Mount Wilson Observatory, in the Palomar Mountain Range. At approximately elevation, it is owned and operated by the California Institute of Technology...
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
Catalogue of Galaxies and of Clusters of Galaxies
The Catalogue of Galaxies and of Clusters of Galaxies was compiled by Fritz Zwicky in 1961–68, and contains 9134 galaxy clusters....
(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
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