| Robert's Quartet | |
 |
|
| Observation data (Epoch J2000) | |
|---|---|
| Constellation(s) | Phoenix |
| Number of galaxies | 4 |
| Brightest member | NGC 92 |
| Other designations | |
| AM 0018-0485 | |
| See also: Galaxy groups and clusters, List of galaxy clusters | |
Robert's Quartet is a compact galaxy group approximately 160 million light-years away in the constellation Phoenix. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Phoenix (ˈfiːnɪks is a minor southern Constellation, introduced by Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman, and popularized NGC 92 is interacting galaxies NGC 87 NGC 88 NGC 89 Galaxy groups and clusters are the largest Gravitationally bound objects to have arisen thus far in the process of cosmic structure formation This page lists some of the more interesting Galaxy clusters and groups Galaxy groups and clusters are the largest Gravitationally bound objects to have arisen thus far in the process of cosmic structure formation A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Phoenix (ˈfiːnɪks is a minor southern Constellation, introduced by Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman, and popularized It is a family of four very different galaxies in the process of colliding and merging. A galaxy is a massive gravitationally bound system consisting of Stars an Interstellar medium of gas and dust, and Dark matter Interacting galaxies ( Colliding galaxies) are the result of one Galaxy 's Gravity disturbing another galaxy Its members are NGC 87, NGC 88, NGC 89 and NGC 92, discovered by John Herschel in the 1830s. NGC 87 is Galaxy interacting galaxies NGC 92 NGC 88 and NGC 89 NGC 88 is a Spiral galaxy located about 160 million Light years from the Earth in the Phoenix constellation, NGC 88 is interacting galaxies NGC 89 is Galaxy interacting galaxies NGC 92 NGC 88 and NGC 87 NGC 92 is interacting galaxies NGC 87 NGC 88 NGC 89 Sir John Frederick William Herschel 1st Baronet KH, FRS ( March 7, 1792 &ndash May 11, 1871)was an For the game see 1830 (board game. Year 1830 ( MDCCCXXX) was a Common year starting on Friday (link will display
The quartet is one of the finest examples of compact groups of galaxies. Because such groups contain four to eight galaxies in a very small region, they are excellent laboratories for the study of galaxy interactions and their effects, in particular on the formation of stars. The quartet has a total visual magnitude of almost 13. The brightest member of the group has a magnitude of about 14. On the sky, the four galaxies are all within a circle of radius of 1. 6 arcmin, corresponding to about 75,000 light-years. It was named by Halton Arp and Barry F. Halton Christian Arp (aka "Chip" is an American Astronomer. Madore, who compiled A Catalogue of Southern Peculiar Galaxies and Associations in 1987.
Members
| Name | Type | Distance from Sun (million ly) |
Magnitude |
|---|---|---|---|
| NGC 87 | IBm pec. Galaxy morphological classification is a system used by Astronomers to divide galaxies into groups based on their visual appearance The Sun (Sol is the Star at the center of the Solar System. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value NGC 87 is Galaxy interacting galaxies NGC 92 NGC 88 and NGC 89 | ~160 | +14. 5 |
| NGC 88 | SB(rs)a pec. NGC 88 is a Spiral galaxy located about 160 million Light years from the Earth in the Phoenix constellation, NGC 88 is interacting galaxies | ~160 | +15. 21 |
| NGC 89 | SB0(s)a pec. NGC 89 is Galaxy interacting galaxies NGC 92 NGC 88 and NGC 87 | ~160 | +14. 57 |
| NGC 92 | SAa pec. NGC 92 is interacting galaxies NGC 87 NGC 88 NGC 89 | ~160 | +14. 29 |
External links
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