NGC 684

NGC 684
NGC 684 imaged by Legacy Surveys
Observation data (J2000.0 epoch)
ConstellationTriangulum
Right ascension01h 50m 14.0407s
Declination+27° 38′ 44.472″
Redshift0.011798
Heliocentric radial velocity3537 ± 1 km/s
Distance135.03 ± 3.13 Mly (41.400 ± 0.960 Mpc)
Group or clusterNGC 684 group (LGG 32)
Apparent magnitude (V)12.50
Apparent magnitude (B)13.30
Characteristics
TypeSb edge-on
Size~137,500 ly (42.15 kpc) (estimated)
Apparent size (V)3.2′ × 0.6′
Other designations
IRAS 01474+2724, IC 165, UGC 1292, MCG +04-05-017, PGC 6759, CGCG 482-022

NGC 684 is a spiral galaxy approximately 135 million light-years away from Earth in the constellation of Triangulum. It was discovered by William Herschel on October 26, 1786. Edward Swift, Lewis's 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.

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.

Supernovae

Two supernovae have been observed in NGC 684:

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 "Results for object NGC 0684". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 4 December 2017.
  2. 1 2 "Revised NGC Data for NGC 684". spider.seds.org. Retrieved December 9, 2017.
  3. 1 2 "Data for NGC 684". www.astronomy-mall.com. Retrieved December 9, 2017.
  4. ↑ 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.
  5. ↑ "SN 2021ass". Transient Name Server. IAU. Retrieved 4 September 2024.
  6. ↑ "SN 2025aml". Transient Name Server. IAU. Retrieved 31 January 2025.