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Encyclopedia > Pegasus Dwarf Irregular Galaxy
Pegasus Dwarf Irregular Galaxy
Observation data: J2000 epoch
Constellation: Pegasus
Right ascension: 23h 28m 36.2s[1]
Declination: +14° 44′ 35″[1]
Redshift: -183 ± 0 km/s[1]
Distance: 3.0 ± 0.1 Mly (920 ± 30 kpc)[2]
Type: dIrr/dSph[1][a]
Apparent dimensions (V): 5′.0 × 2′.7[1]
Apparent magnitude (V): 13.2[1]
Notable features:
Other designations
UGC 12613,[1] PGC 71538,[1] DDO 216,[1]

Pegasus Dwarf,[1] PegDIG[1] The J2000. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... This article does not cite any references or sources. ... Pegasus is a northern constellation, named after the mythological Pegasus. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... Redshift of spectral lines in the optical spectrum of a supercluster of distant galaxies (right), as compared with that of the Sun (left). ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... Look up second in Wiktionary, the free dictionary. ... (Redirected from 1 E23 m) Categories: Orders of magnitude (length) ... A light-year, symbol ly, is the distance light travels in one year: exactly 9. ... A parsec is the distance from the Earth to an astronomical object which has a parallax angle of one arcsecond. ... Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ... The angular diameter of an object as seen from a given position is the diameter measured as an angle. ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ... The Uppsala General Catalogue of Galaxies (UGC) is a catalogue of 12921 galaxies visible from the northern hemisphere. ... The Principal Galaxies Catalogue (PGC) is an astronomical catalogue that contains all available primary information for each of the known galaxies: morphological type, major and minor axes, magnitude, radial velocity and position angle. ... David Dunlap Observatory Catalogue, known as the DDO or A Catalogue of Dwarf Galaxies, is a catalogue of dwarf galaxies that was published in 1959 (and later expanded in 1966) by Sidney van den Bergh. ...

See also: Galaxy, List of galaxies

The Pegasus Dwarf Irregular Galaxy (also known as Peg DIG or the Pegasus Dwarf) is an irregular galaxy and a dwarf galaxy in the direction of the constellation Pegasus. It was discovered by A.G. Wilson in the 1950s. The Pegasus Dwarf is a companion of the Andromeda Galaxy in the Local Group. NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 17,000 parsecs in diameter and approximately 20 million parsecs distant. ... List of galaxies: Abell 1835 IR1916 AM 0644-741 Andromeda Galaxy (M31/NGC 224) Andromeda I Andromeda II Andromeda III Aquarius Dwarf Barnards Galaxy (NGC 6822) Black Eye Galaxy (M64/NGC 4826) Bodes Galaxy (M81/NGC 3031) Canis Major Dwarf Galaxy Carina Dwarf Centaurus A Galaxy Draco Dwarf Fornax... This article or section does not adequately cite its references or sources. ... A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Ways 200-400 billion stars. ... This article does not cite any references or sources. ... Pegasus is a northern constellation, named after the mythological Pegasus. ... Albert George Wilson (July 28, 1918 – ?) was an American astronomer. ... This does not cite any references or sources. ... M31 in a small telescope The Andromeda Galaxy (IPA: , also known as Messier 31, M31, or NGC 224; older texts often called it the Andromeda Nebula) is a spiral galaxy approximately 2. ... A member of the Local Group of galaxies, irregular galaxy Sextans A is 4. ...

Contents

General information

The Pegasus Dwarf is a galaxy with mainly metal-poor stellar populations.[citation needed] NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 17,000 parsecs in diameter and approximately 20 million parsecs distant. ...


In 1975 Tully & Fisher determined that it was part of the Local Group.[citation needed] The metallicity and the related distance estimate has been subject to discussions in the scientific literature, with varying results, however, recently, by use of the tip of the red giant branch, a distance within 10% error was achieved in 2000[3][4] and then improved to 3% in 2005.[2] The globular cluster M80. ... Tip of the Red Giant Branch (TRGB) is a primary distance indicator used in astronomy. ...


See also

The Pegasus Dwarf Spheroidal (also known as Andromeda VI or Peg dSph for short) is a dwarf spheroidal galaxy about 2. ... Holographic map of the Pegasus Galaxy. ... Stargate Atlantis is a Canadian-American science fiction television program, part of the Stargate franchise. ...

Notes

  1. ^ NED gives the galaxy classification as both dIrr and dSph, which means that it is a transitory between dwarf irregular and dwarf spheroidal. It is noted as transitory in Cole et al 1999.[5]

References

  1. ^ a b c d e f g h i j k NASA/IPAC Extragalactic Database. Results for PegDIG. Retrieved on 2007-03-15.
  2. ^ a b McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society 356 (4): 979-997. 
  3. ^ Karachentsev, Igor D.; Karachentseva, Valentina E.; Huchtmeier, Walter K.; Makarov, Dmitry I. (2004). "A Catalog of Neighboring Galaxies". The Astronomical Journal 127 (4): 2031-2068. 
  4. ^ van den Bergh, Sidney (2000). The Galaxies of the Local Group. Cambridge, UK: Cambridge University Press. ISBN 0521651816. 
  5. ^ Cole, Andrew A.; Tolstoy, Eline; Gallagher, John S., III; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E.; Burrows, Christopher J.; Clarke, John T.; Crisp, David; Griffiths, Richard E.; Grillmair, Carl J.; Hester, Jeff J.; Krist, John E.; Meadows, Vikki; Scowen, Paul A.; Stapelfeldt, Karl R.; Trauger, John T.; Watson, Alan M.; Westphal, James R. (1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657-1670. 

  Results from FactBites:
 
Galaxies (1692 words)
NGC 14 - An irregular galaxy in Pegasus
NGC 1055 - A "boxy/bulge" galaxy in Cetus.
NGC 6814 - A Seyfert galaxy in Aqula
Pegasus: Biography and Much More from Answers.com (1189 words)
Bellerophon captured Pegasus and rode him in several of his exploits, including his fight with the Chimera, but when he tried to ride the winged horse to heaven he was unseated and killed, and Pegasus was placed in the sky as a constellation.
Pegasus aided the hero Bellerophon, who is a double in some way for Perseus, in his fight against both the Chimera and the Amazons.
Pegasus was eventually turned into a constellation, but a single feather fell to the earth near the city of Tarsus (hence its name).
  More results at FactBites »

 
 

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