NGC 684
In today's article, we are going to delve into the exciting world of NGC 684. Whether you're an expert in the field or just starting to explore it, this article has something for everyone. We will explore the most relevant aspects of NGC 684, from its history to its impact on today's society. Additionally, we will discuss the latest trends and discoveries related to NGC 684, as well as opinions from experts in the field. Get ready to embark on a fascinating journey through NGC 684 and discover everything this theme has to offer. Do not miss it!
| 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] |
| Heliocentric 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, CGCG 482-022[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
- ^ a b c d e f g h i j "Results for object NGC 0684". NASA/IPAC Extragalactic Database. NASA and Caltech. 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.
- ^ 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". Transient Name Server. IAU. Retrieved 4 September 2024.
- ^ "SN 2025aml". Transient Name Server. IAU. Retrieved 31 January 2025.
External links
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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