NGC 684 | |
---|---|
Observation data (J2000.0 epoch) | |
Constellation | Triangulum |
Right ascension | 01h 50m 14.02s [1] |
Declination | +27° 38′ 44.4″ [1] |
Redshift | 0.011791 [1] |
Heliocentric radial velocity | 3535 ± 1 km/s [1] |
Distance | 135 Mly [1] |
Apparent magnitude (V) | 12.50 [2] |
Apparent magnitude (B) | 13.30 [2] |
Characteristics | |
Type | Sb |
Apparent size (V) | 3.2 x 0.6 [1] |
Other designations | |
IC 165, MCG +04-05-017, PGC 6759 |
NGC 684 is a spiral galaxy approximately 135 million light-years away from Earth in the constellation of Triangulum. [1] It was discovered by William Herschel on October 26, 1786. [3] Edward Swift, Lewis' son, found this galaxy again on 18 Jan 1890 while "searching for Swift's Comet." and it was reported as a new object in list IX-6. [3]
One supernova has been observed in NGC 684: SN 2021ass (type II, mag. 18.1). [4]
The Pinwheel Galaxy is a face-on, unbarred, and counterclockwise spiral galaxy located 21 million light-years from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain in 1781 and was communicated that year to Charles Messier, who verified its position for inclusion in the Messier Catalogue as one of its final entries.
NGC 6373 is a barred spiral galaxy located in the constellation Draco. It is designated as SBc in the galaxy morphological classification scheme and was discovered by the American astronomer Lewis A. Swift on 13 June 1885. There are two recorded supernovae in this galaxy designated SN 2001ad and SN 2012an.
NGC 198 is a spiral galaxy located in the constellation Pisces. It was discovered on December 25, 1790 by William Herschel.
NGC 477 is a spiral galaxy in the constellation Andromeda. It is located approximately 250 million light-years from Earth and was discovered on October 18, 1786 by astronomer William Herschel.
NGC 493, also occasionally referred to as PGC 4979 or GC 281, is a barred spiral galaxy in the constellation Cetus. It is located approximately 90 million light-years from Earth and was discovered on December 20, 1786 by astronomer William Herschel. It was later also observed by his son, John Herschel. John Dreyer, creator of the New General Catalogue, described the galaxy as "very faint, large, much extended 60°" with "a little brighter middle".
NGC 495, also occasionally referred to as PGC 5037, UGC 920 or GC 278, is a barred spiral galaxy in the constellation Pisces. It is located approximately 184 million light-years from the Solar System and was discovered on 12 September 1784 by astronomer William Herschel.
NGC 497 is a barred spiral galaxy approximately 336 million light-years away from Earth in the constellation of Cetus. It was discovered by French astronomer Édouard Stephan on November 6, 1882.
NGC 725 is a spiral galaxy approximately 450 million light-years away from Earth in the constellation of Cetus. It was discovered by Francis Preserved Leavenworth on November 9, 1885 with the 26" refractor at the Leander McCormick Observatory.
NGC 7259 is a spiral galaxy approximately 66 million light-years away from Earth in the constellation of Piscis Austrinus. It was discovered by John Herschel on September 28, 1834.
NGC 805 is a lenticular galaxy approximately 194 million light-years away from Earth in the constellation of Triangulum. It was discovered by German astronomer Heinrich Louis d'Arrest on September 26, 1864, with the 11-inch refractor at Copenhagen.
NGC 806 is a spiral galaxy approximately 166 million light-years away from Earth in the constellation Cetus. It was discovered by American astronomer Lewis A. Swift on November 1, 1886 with the 16" refractor at Warner Observatory.
NGC 5640 is a spiral galaxy approximately 660 million light-years away from Earth in the constellation of Camelopardalis. It was discovered by British astronomer William Herschel on December 20, 1797.
NGC 1019 is a barred spiral galaxy approximately 316 million light-years away from Earth in the constellation of Cetus. It was discovered by French astronomer Édouard Stephan on December 1, 1880 with the 31" reflecting telescope at the Marseille Observatory.
NGC 1060 is a lenticular galaxy approximately 256 million light-years away from Earth in the constellation of Triangulum. It was discovered by William Herschel on September 12, 1784.
NGC 1189 is a barred spiral galaxy approximately 105 million light-years away from Earth in the constellation of Eridanus. It was discovered by American astronomer Francis Leavenworth on December 2, 1885 with the 26" refractor at Leander McCormick Observatory.
NGC 1255 is a barred spiral galaxy approximately 69 million light-years away from Earth in the constellation of Fornax.
NGC 521, also occasionally referred to as PGC 5190 or UGC 962, is a barred spiral galaxy located approximately 224 million light-years from the Solar System in the constellation Cetus. It was discovered on 8 October 1785 by astronomer William Herschel.
NGC 819 is a spiral galaxy approximately 302 million light-years away from Earth in the constellation of Triangulum. It forms a visual pair with the galaxy NGC 816 5.7' WNW.
NGC 739 is a spiral galaxy approximately 193 million light-years away from Earth in the constellation of Triangulum.
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.