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| Uppsala General Catalogue of Galaxies | |
|---|---|
| Name | Uppsala General Catalogue of Galaxies |
| Author | Peter Nilson |
| Country | Sweden |
| Language | English |
| Subject | Astronomy |
| Publisher | Uppsala Astronomical Observatory |
| Pub date | 1973 |
Uppsala General Catalogue of Galaxies is a comprehensive astronomical catalog first published in 1973 that lists 12,921 galaxies visible from the northern hemisphere, compiled to support observational programs at 20th-century observatories. The catalogue was produced within the environment of the Uppsala Astronomical Observatory and reflects photographic surveys undertaken at institutions such as the Palomar Observatory and the Royal Observatory, Edinburgh, and it has been cited in work at organizations like the European Southern Observatory, the Harvard College Observatory, and the Smithsonian Astrophysical Observatory. The UG catalog influenced subsequent compilations used by researchers at institutions including the Max Planck Institute for Astrophysics, the National Aeronautics and Space Administration, and the Space Telescope Science Institute.
The catalogue originated from efforts led by astronomers associated with Uppsala University and the Uppsala Astronomical Observatory during the era of photographic plate astronomy, drawing on plate material from the Palomar Observatory Sky Survey, the Harvard College Observatory patrol plates, and the Royal Greenwich Observatory holdings, and was informed by classification schemes from the Carnegie Institution and the Mount Wilson Observatory. Its preparation involved collaborations among personnel who worked at the Leiden Observatory, the Stockholm Observatory, and the Royal Observatory, Edinburgh, and it was discussed in meetings of the International Astronomical Union and at conferences hosted by institutions such as the Institut d'Astrophysique de Paris. The catalogue's release paralleled projects at the Anglo-Australian Observatory and the Cerro Tololo Inter-American Observatory and later intersected with space-based missions managed by agencies like the European Space Agency and NASA.
Entries in the catalogue consolidate positional, morphological, and photometric information gathered from photographic surveys conducted at the Palomar Observatory, the Mount Palomar Observatory, and the Kitt Peak National Observatory, with morphological classification influenced by systems developed at the California Institute of Technology and the Harvard-Smithsonian Center for Astrophysics. Data fields include right ascension and declination in epochs tied to standards used at the U.S. Naval Observatory and the International Astronomical Union, diameter and axis ratio estimates comparable to measures used by the Royal Observatory, Greenwich, and apparent magnitudes referenced against photometric sequences maintained by the European Southern Observatory and the Royal Greenwich Observatory. The dataset was cross-checked against catalogs maintained at the Smithsonian Institution and the Leiden Observatory and was later compared with radio catalogues compiled at the National Radio Astronomy Observatory and infrared surveys from the Infrared Astronomical Satellite processed by NASA facilities.
The catalogue uses a simple numeric identifier system assigned by sequential ordering similar to schemes adopted in catalogs from the Harvard College Observatory and the Royal Observatory, Edinburgh, and entries were indexed for use with telescope scheduling at observatories such as Palomar and Kitt Peak. Positional coordinates are presented in a format consistent with standards promulgated by the International Astronomical Union and maintained by the U.S. Naval Observatory and were intended for cross-referencing with contemporaneous compilations like the New General Catalogue maintained by the Royal Astronomical Society of Canada and records at the Smithsonian Astrophysical Observatory. The UG identifiers were adopted in observing lists circulated among researchers at institutions including the Max Planck Society, the California Institute of Technology, and the Johns Hopkins University and served as keys when merging datasets with catalogs from the Anglo-Australian Observatory and the Mount Stromlo Observatory.
The catalogue includes numerous prominent galaxies that also appear in the New General Catalogue and in lists curated by the Royal Greenwich Observatory, and a subset of objects were targeted in spectroscopic campaigns at the European Southern Observatory, the Palomar Observatory, and the Kitt Peak National Observatory. Statistical properties reported in the catalogue—such as morphological type distributions, axial ratio histograms, and apparent magnitude counts—have been used in comparative studies alongside results from the Sloan Digital Sky Survey, the Two Micron All Sky Survey conducted by the Jet Propulsion Laboratory, and radio source catalogs from the National Radio Astronomy Observatory. Individual UG entries were later observed with instruments at the Space Telescope Science Institute and studied in follow-up by teams at the Max Planck Institute for Extraterrestrial Physics, the Harvard-Smithsonian Center for Astrophysics, and the Carnegie Institution for Science.
Researchers at institutions such as the European Southern Observatory, the Smithsonian Astrophysical Observatory, and NASA centers have used the catalogue for sample selection in studies of galaxy morphology, clustering, and luminosity functions alongside complementary resources from the Royal Observatory, Edinburgh, the Uppsala Astronomical Observatory, and the Leiden Observatory. The catalogue informed observing programs at the Palomar Observatory, the Kitt Peak National Observatory, and the Anglo-Australian Observatory and has been cited in analyses connected to projects at the Max Planck Institute, the Space Telescope Science Institute, and the California Institute of Technology. Its legacy persists in databases maintained by organizations like the Centre de Données astronomiques de Strasbourg and in cross-match efforts involving the Sloan Digital Sky Survey, the Two Micron All Sky Survey, and the Galaxy Evolution Explorer managed by NASA.
Digitization efforts have integrated UG entries into electronic services hosted by the Centre de Données astronomiques de Strasbourg, the Harvard-Smithsonian Center for Astrophysics databases, and the NASA/IPAC Extragalactic Database, enabling cross-referencing with surveys from the European Space Agency, the Sloan Digital Sky Survey, and the Infrared Astronomical Satellite. Modern revisions and value-added catalogs have been produced through collaborations among teams at the Max Planck Institute for Astrophysics, the Space Telescope Science Institute, and the Johns Hopkins University, and have been employed in analyses connected to missions overseen by NASA and the European Space Agency and archived at the Smithsonian Institution.
Category:Astronomical catalogues