NGC 7689

NGC 7689
NGC 7689 imaged by Legacy Surveys
Observation data (J2000 epoch)
ConstellationPhoenix
Right ascension23h 33m 16.7309s
Declination−54° 05′ 39.692″
Redshift0.006571±0.0000170
Heliocentric radial velocity1,970±5 km/s
Distance79.30 ± 1.36 Mly (24.315 ± 0.417 Mpc)
Apparent magnitude (V)12.2
Characteristics
TypeSAB(rs)cd
Size~92,300 ly (28.29 kpc) (estimated)
Apparent size (V)2.9′ × 1.9′
Other designations
ESO 192- G 007, IRAS 23305-5422, 2MASX J23331672-5405401, PGC 71729

NGC 7689 is an intermediate spiral galaxy in the constellation of Phoenix. Its velocity with respect to the cosmic microwave background is 1,791±13 km/s, which corresponds to a Hubble distance of 86.2 ± 6.1 Mly (26.42 ± 1.86 Mpc). Also, 13 non-redshift measurements give a closer mean distance of 79.30 ± 1.36 Mly (24.315 ± 0.417 Mpc). It was discovered by Scottish astronomer James Dunlop on 5 September 1826.

NGC 7689 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars. It is also a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

Supernova

One supernova has been observed in NGC 7689:

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 "Results for object NGC 7689". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 13 December 2025.
  2. ↑ "Distance Results for NGC 7689". NASA/IPAC Extragalactic Database. NASA. Retrieved 13 December 2025.
  3. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 7689". Celestial Atlas. Retrieved 13 December 2025.
  4. ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D.; Davies, R. I.; Hönig, S. F.; Ricci, C.; Rosario, D. J.; Salvato, M.; Shankar, F.; Stern, D. (2020). "Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 MPC". Monthly Notices of the Royal Astronomical Society. 494 (2): 1784. arXiv:2003.05959. Bibcode:2020MNRAS.494.1784A. doi:10.1093/mnras/staa766.
  5. 1 2 "NGC 7689". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 December 2025.
  6. ↑ Chen, Yan-Ping; Zaw, Ingyin; Farrar, Glennys R.; Elgamal, Sana (2022). "A Uniformly Selected, Southern-sky 6dF, Optical AGN Catalog". The Astrophysical Journal Supplement Series. 258 (2): 29. arXiv:2111.13217. Bibcode:2022ApJS..258...29C. doi:10.3847/1538-4365/ac4157.
  7. ↑ Evans, R.; Benton, R.; Beaman, S.; Pogson, J.; Ryan, S. (1996). "Supernova 1996al in NGC 7689". International Astronomical Union Circular (6437): 1. Bibcode:1996IAUC.6437....1E.
  8. ↑ "SN 1996al". Transient Name Server. IAU. Retrieved 13 December 2025.