NGC4782 is an

elliptical galaxy An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main galaxy morphological classification, classes of galaxy described by Edwin Hubble in his Hub ...

in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ...

Corvus ''Corvus'' is a widely distributed genus of passerine birds ranging from medium-sized to large-sized in the family Corvidae. It includes species commonly known as crows, ravens, and rooks. The species commonly encountered in Europe are the car ...

. Its velocity with respect to the

cosmic microwave background The cosmic microwave background (CMB, CMBR), or relic radiation, is microwave radiation that fills all space in the observable universe. With a standard optical telescope, the background space between stars and galaxies is almost completely dar ...

for is , which corresponds to a

Hubble distance Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther a galaxy is from the Earth, the faster ...

of . However, nine ''non-redshift'' measurements give a closer distance of . It was discovered by German-British astronomer

William Herschel Frederick William Herschel ( ; ; 15 November 1738 – 25 August 1822) was a German-British astronomer and composer. He frequently collaborated with his younger sister and fellow astronomer Caroline Herschel. Born in the Electorate of Hanover ...

on 27 March 1786. NGC 4782 along with NGC 4783 are listed together as Holm485 in Erik Holmberg's ''A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems'', published in 1937. They are also listed as VV201 in the

Vorontsov-Vel'yaminov Interacting Galaxies Vorontsov-Vel'yaminov Interacting Galaxies are those included in the Atlas and Catalogue of Interacting Galaxies, by B.A. Vorontsov-Vel'yaminov, R.I. Noskova and V.P. Arkhipova. It was published by the Astronomical Council of the Academy of Scien ...

catalogue. However, since NGC 4782 is about farther away than NGC 4783 (using Hubble distance), the grouping is purely optical. The

SIMBAD SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data) is an astronomy, astronomical database of objects beyond the Solar System. It is maintained by the Centre de données astronomiques de Strasbourg (CDS), Fr ...

database lists NGC4782 as a

radio galaxy A radio galaxy is a galaxy with giant regions of radio emission extending well beyond its visible structure. These energetic radio lobes are powered by jets from its active galactic nucleus. They have luminosities up to 1039 W at radio wav ...

, i.e. it has giant regions of radio emission extending well beyond its visible structure.

Supernovae

Two

supernova A supernova (: supernovae or supernovas) is a powerful and luminous explosion of a star. A supernova occurs during the last stellar evolution, evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion ...

e have been observed in NGC 4782: * SN1956B (type unknown, mag. 18.6) was discovered by

Fritz Zwicky Fritz Zwicky (; ; February 14, 1898 – February 8, 1974) was a Swiss astronomer. He worked most of his life at the California Institute of Technology in the United States of America, where he made many important contributions in theoretical an ...

on 8 April 1956. * SN2015B ( TypeIa, mag. 15) was discovered by the Italian Supernovae Search Project on 5 January 2015.

References

External links

* {{NGC50 4782 043924 -02-33-050 Corvus (constellation) 17860327 Discoveries by William Herschel Elliptical galaxies Radio galaxies

Supernovae

See also

References

External links