The

Uppsala Uppsala (, or all ending in , ; archaically spelled ''Upsala'') is the county seat of Uppsala County and the List of urban areas in Sweden by population, fourth-largest city in Sweden, after Stockholm, Gothenburg, and Malmö. It had 177,074 inha ...

General Catalogue of Galaxies (UGC) is a catalogue of 12,921

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. A slashing smudge across the sky

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 A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of one degree. Since one degree is of a turn (or complete rotation), one minute of arc is of a turn. The na ...

or to a limiting

apparent magnitude Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's li ...

of 14.5. The primary source of data is the blue prints of the

Palomar Observatory Sky Survey Palomar may refer to: Places * Any of several locations in San Diego County, California: ** Palomar Mountain ** Palomar Observatory, located on Palomar Mountain ** Palomar College in San Marcos, California ** Palomar Medical Center in Escondido, C ...

(POSS). It also includes galaxies smaller than 1.0

in diameter but brighter than 14.5 magnitude from the

Catalogue of Galaxies and of Clusters of Galaxies The Catalogue of Galaxies and of Clusters of Galaxies (or CGCG) was compiled by Fritz Zwicky in 1961–68. It contains 29,418 galaxies and 9,134 galaxy clusters. Gallery File:I Zwicky 18a.jpg, I Zwicky 18 File:Galaxy I Zwicky 32.jpeg, I Zwicky 3 ...

(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.

References

Astronomical catalogues of galaxies * 1973 documents 1973 in science

External links

UGC - Uppsala General Catalog of Galaxies
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Addendum

See also

References

External links