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]
| NGC 684 | |
|---|---|
 NGC 684 (SDSS) | |
| 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 | |
One supernova has been observed in NGC 684: SN 2021ass (type II, mag. 18.1).[4]
See also
editReferences
edit- ^ a b c d e f g "NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 4 December 2017.
- ^ a b "Revised NGC Data for NGC 684". spider.seds.org. Retrieved December 9, 2017.
- ^ a b "Data for NGC 684". www.astronomy-mall.com. Retrieved December 9, 2017.
- ^ "SN 2021ass". Transient Name Server. IAU. Retrieved 4 September 2024.
External links
edit
Media related to NGC 684 at Wikimedia Commons- NGC 684 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- SEDS
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