NGC 644 | |
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![]() DECam image of NGC 644 | |
Observation data (J2000 epoch) | |
Constellation | Phoenix |
Right ascension | 01h 38m 52.975s [1] |
Declination | −42° 35′ 07.19″ [1] |
Redshift | 0.020731 [2] |
Helio radial velocity | 6151 km/s [2] |
Distance | 268.8 Mly (82.41 Mpc) [3] |
Apparent magnitude (B) | 14.79 [2] |
Characteristics | |
Type | SB(r)bc: [4] |
Size | 126.8 kly (38.88 kpc) [4] |
Other designations | |
MCG -07-04-027, PGC 6097 [2] |
NGC 644 is a barred spiral galaxy in the constellation Phoenix in the southern sky. It is estimated to be 270 million light-years from the Milky Way and has a diameter of approximately 130,000 light-years. [4] Together with NGC 641, it probably forms a gravitationally bound pair of galaxies. The object was discovered on September 5, 1834 by John Herschel. [5] [6]
Two supernovae have been observed in NGC 644: SN 2011gm (type Ia, mag. 15.8), [7] and SN 2018cmj (type II, mag. 17.1). [8]
Messier 66 or M66, also known as NGC 3627, is an intermediate spiral galaxy in the southern, equatorial half of Leo. It was discovered by French astronomer Charles Messier on 1 March 1780, who described it as "very long and very faint". This galaxy is a member of a small group of galaxies that includes M65 and NGC 3628, known as the Leo Triplet or the M66 Group. M65 and M66 are a common object for amateur astronomic observation, being separated by only 20′.
NGC 5962 is a spiral galaxy in the equatorial constellation of Serpens Caput. It was discovered by the Anglo-German astronomer William Herschel on March 21, 1784. The NGC 5962 galaxy is located at a distance of 120 million light years and is receding with a heliocentric radial velocity of 1,957 km/s. It is the brightest member of the eponymously-named NGC 5962 group, which overlaps with the nearby NGC 5970 group; the two groups may be gravitationally bound.
NGC 4051 is an intermediate spiral galaxy in the constellation of Ursa Major. It was discovered on 6 February 1788 by John Herschel.
NGC 5490 is a radio galaxy in the constellation Boötes.
NGC 352 is a barred spiral galaxy in the constellation Cetus. It was discovered on September 20, 1784 by William Herschel. It was described as "pretty faint, small, irregularly extended" by John Louis Emil Dreyer, the compiler of the New General Catalogue; he also noted an "8th magnitude star 97 seconds of time to east" relative to the galaxy.
NGC 6850 is a barred lenticular galaxy in the constellation Telescopium, discovered by John Herschel in 1836.
NGC 4217 is an edge-on spiral galaxy which lies approximately 60 million light-years away in the constellation of Canes Venatici. It is a possible companion galaxy to Messier 106.
NGC 105 is a spiral galaxy estimated to be about 240 million light-years away in the constellation of Pisces. It was discovered by Édouard Stephan in 1884 and its apparent magnitude is 14.1.
NGC 2613 is a spiral galaxy in the southern constellation of Pyxis, next to the western constellation border with Puppis. It was discovered by the German-born astronomer William Herschel on November 20, 1784. With an apparent visual magnitude of 10.5, the galaxy is faintly visible using a telescope with a 100 mm (4 in) aperture. It appears spindle-shaped as it is almost edge-on to observers on Earth.
NGC 157 is an intermediate spiral galaxy in the constellation of Cetus. The compiler of the New General Catalogue, John Louis Emil Dreyer noted that NGC 157 was "pretty bright, large, extended, between 2 considerably bright stars". It was discovered on December 13, 1783 by William Herschel.
NGC 252 is a lenticular galaxy located in the constellation Andromeda. It was discovered by William Herschel in 1786.
NGC 5002 is a Magellanic spiral galaxy in Canes Venatici. It was discovered by Heinrich d'Arrest in 1865. It is also known as MCG 6-29-51, PGC 45728, UGC 8254.
NGC 3697 is a spiral galaxy in the constellation of Leo. It was discovered on 24 February 1827 by John Herschel. It was described as "extremely faint, very small, extended 90°" by John Louis Emil Dreyer, the compiler of the New General Catalogue. It is a member of HCG 53, a compact group of galaxies.
NGC 820 is a spiral galaxy located in the constellation Aries about 210 million light-years from the Milky Way. It was discovered by British astronomer John Herschel in 1828.
NGC 550 is a spiral galaxy in the constellation Cetus. It is estimated to be about 300 million light-years from the Milky Way and has a diameter of approximately 110,000 light years. The German-British astronomer William Herschel discovered it on 8 October 1785.
NGC 813 is a lenticular galaxy in the constellation Hydrus. It is estimated to be 390 million light-years from the Milky Way and has a diameter of approximately 140,000 ly. NGC 813 was discovered on November 24, 1834 by the British astronomer John Herschel.
NGC 941 is an intermediate spiral galaxy in the constellation Triangulum. It is an estimated 55 million light-years from the Milky Way and has a diameter of approximately 55,000 light years. The galaxies NGC 926, NGC 934, NGC 936, NGC 955 are located in the same sky area. NGC 941 was discovered by the astronomer William Herschel using on 6 January 1785.
NGC 706 is a spiral galaxy located in the Pisces constellation about 230 million light years from the Milky Way. It was discovered by the German–British astronomer William Herschel in 1786.
NGC 5557 is an elliptical galaxy in the constellation Boötes. It was discovered by William Herschel on May 1, 1785. The distance to NGC 5557 is not well known, but it is estimated to be about 127 million light-years away.
NGC 3254 is a spiral galaxy in the constellation Leo Minor. It was discovered on March 13, 1785 by the astronomer William Herschel. It is a member of the NGC 3254 Group of galaxies, which is a member of the Leo II Groups, a series of galaxies and galaxy clusters strung out from the right edge of the Virgo Supercluster.