Barred irregular galaxy

A barred irregular galaxy is an irregular version of a barred spiral galaxy. Examples include the Large Magellanic Cloud[1] and NGC 6822.[2] Some barred irregular galaxies (like the Large Magellanic Cloud) may be dwarf spiral galaxies, which have been distorted into an irregular shape by tidal interactions with a more massive neighbor.


  1. ^ Sidney van den Bergh (1999). "The Local Group of Galaxies". arXiv:astro-ph/9908050.
  2. ^ Norbert Przybilla, Quantitative Spectroscopy of Supergiants, Munich, 2002

C57 may refer to :

C-57 Lodestar, an American military aircraft

JNR Class C57, a class of Japanese steam locomotive

Caldwell 57 (NGC 6822, Barnard's Galaxy), a barred irregular galaxy in the constellation Sagittariusand also :

Two Knights Defense ECO code

Hours of Work and Manning (Sea) Convention, 1936 code

Malignant neoplasms of other and unspecified female and genital organs ICD-10 code


C72 may refer to :

Ruy Lopez chess openings ECO code

Malignant neoplasm of spinal cord, cranial nerves and other parts of central nervous system ICD-10 code

Siemens C72, a mobile phone

Honda C71, C76, C72, C77 Dream, motorcycle different models

Paid Vacations (Seafarers) Convention, 1946 code

Caldwell 72 (NGC 55), a barred irregular galaxy in the constellation Sculptor

Caldwell catalogue

The Caldwell catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Patrick Moore as a complement to the Messier catalogue.While the Messier catalogue is used by amateur astronomers as a list of deep-sky objects for observation, Moore noted that Messier's list was not compiled for that purpose and excluded many of the sky's brightest deep-sky objects, such as the Hyades, the Double Cluster (NGC 869 and NGC 884), and the Sculptor Galaxy (NGC 253). The Messier catalogue was actually compiled as a list of known objects that might be confused with comets. Moore also observed that since Messier compiled his list from observations in Paris, it did not include bright deep-sky objects visible in the Southern Hemisphere, such as Omega Centauri, Centaurus A, the Jewel Box, and 47 Tucanae. Moore compiled a list of 109 objects to match the commonly accepted number of Messier objects (he excluded M110), and the list was published in Sky & Telescope in December 1995.Moore used his other surname – Caldwell – to name the list, since the initial of "Moore" is already used for the Messier catalogue. Entries in the catalogue are designated with a "C" and the catalogue number (1 to 109).

Unlike objects in the Messier catalogue, which are listed roughly in the order of discovery by Messier and his colleagues, the Caldwell catalogue is ordered by declination, with C1 being the most northerly and C109 being the most southerly, although two objects (NGC 4244 and the Hyades) are listed out of sequence. Other errors in the original list have since been corrected: it incorrectly identified the S Norma Cluster (NGC 6087) as NGC 6067 and incorrectly labelled the Lambda Centauri Cluster (IC 2944) as the Gamma Centauri Cluster.

List of NGC objects (2001–3000)

This is a list of NGC objects 2001–3000 from the New General Catalogue (NGC). The astronomical catalogue is composed mainly of star clusters, nebulae, and galaxies. Other objects in the catalogue can be found in the other subpages of the list of NGC objects.

The constellation information in these tables is taken from The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer, which was accessed using the "VizieR Service". Galaxy types are identified using the NASA/IPAC Extragalactic Database. The other data of these tables are from the SIMBAD Astronomical Database unless otherwise stated.

NGC 4214

NGC 4214 is a dwarf barred irregular galaxy located around 10 million light-years away in the constellation Canes Venatici.

NGC 6822

NGC 6822 (also known as Barnard's Galaxy, IC 4895, or Caldwell 57) is a barred irregular galaxy approximately 1.6 million light-years away in the constellation Sagittarius. Part of the Local Group of galaxies, it was discovered by E. E. Barnard in 1884 (hence its name), with a six-inch refractor telescope. It is one of the closer galaxies to the Milky Way. It is similar in structure and composition to the Small Magellanic Cloud. It is about 7,000 light-years in diameter.

NGC 87

NGC 87 is a diffuse, highly disorganized barred irregular galaxy, part of Robert's Quartet, a group of four interacting galaxies.

Active nuclei
Energetic galaxies
Low activity
See also

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