Astronomy:NGC 684
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| NGC 684 | |
|---|---|
 NGC 684 (SDSS) | |
| Observation data (J2000.0 epoch) | |
| Constellation | Triangulum |
| Right ascension | 01h 50m 14.0407s [1] |
| Declination | +27° 38′ 44.472″ [1] |
| Redshift | 0.011798 [1] |
| Helio radial velocity | 3537 ± 1 km/s [1] |
| Distance | 135.03 ± 3.13 Mly (41.400 ± 0.960 Mpc)[1] |
| Group or cluster | NGC 684 group (LGG 32) |
| Apparent magnitude (V) | 12.50 [2] |
| Apparent magnitude (B) | 13.30 [2] |
| Characteristics | |
| Type | Sb edge-on [1] |
| Size | ~137,500 ly (42.15 kpc) (estimated)[1] |
| Apparent size (V) | 3.2′ × 0.6′[1] |
| Other designations | |
| IRAS 01474+2724, IC 165, UGC 1292, MCG+04-05-017, PGC 6759[1] | |
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 Group
NGC 684 is the largest member of a group of galaxies named after it (also known as LGG 32), which includes the galaxies NGC 670 and IC 1731.[4]
Supernovae
Two supernovae have been observed in NGC 684:
- SN 2021ass (type II, mag. 18.1122) was discovered by the Zwicky Transient Facility on 18 January 2021.[5]
- SN 2025aml (type II, mag. 18.1168) was discovered by the Zwicky Transient Facility on 31 January 2025.[6]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 "Results for object NGC 0684". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+0684.
- ↑ 2.0 2.1 "Revised NGC Data for NGC 684". http://spider.seds.org/ngc/revngcic.cgi?NGC684.
- ↑ 3.0 3.1 "Data for NGC 684". http://www.astronomy-mall.com/Adventures.In.Deep.Space/NGC%201%20-%20999%20(11-30-17).htm.
- ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series 100: 47. Bibcode: 1993A&AS..100...47G.
- ↑ "SN 2021ass". IAU. https://www.wis-tns.org/object/2021ass.
- ↑ "SN 2025aml". IAU. https://www.wis-tns.org/object/2025aml.
External links
- NGC 684 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- SEDS
Coordinates: 
01h 50m 14.0407s, +27° 38′ 44.472″
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