Astronomy:NGC 7689

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NGC 7689
NGC 7689 imaged by Legacy Surveys
Observation data (J2000 epoch)
ConstellationPhoenix
Right ascension 23h 33m 16.7309s[1]
Declination−54° 05′ 39.692″[1]
Redshift0.006571±0.0000170[1]
Helio radial velocity1,970±5 km/s[1]
Distance79.30 ± 1.36 Mly (24.315 ± 0.417 Mpc)[1]
Apparent magnitude (V)12.2[1]
Characteristics
TypeSAB(rs)cd[1]
Size~92,300 ly (28.29 kpc) (estimated)[1]
Apparent size (V)2.9′ × 1.9′[1]
Other designations
ESO 192- G 007, IRAS 23305-5422, PGC 71729[1]

NGC 7689 is a 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).[1] Also, 13 non-redshift measurements give a closer mean distance of 79.30 ± 1.36 Mly (24.315 ± 0.417 Mpc).[2] It was discovered by Scottish astronomer James Dunlop on 5 September 1826.[3]

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.[4][5] 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.[6][5]

Supernova

One supernova has been observed in NGC 7689:

  • SN 1996al (Type II, mag. 14.0) was discovered by Robert Evans, R. Benton, and S. Beaman on 22 July 1996.[7][8]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 7689". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+7689. 
  2. ↑ "Distance Results for NGC 7689". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+7689. 
  3. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 7689". https://cseligman.com/text/atlas/ngc76a.htm#7689. 
  4. ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D. et al. (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. doi:10.1093/mnras/staa766. Bibcode: 2020MNRAS.494.1784A. 
  5. ↑ 5.0 5.1 "NGC 7689". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+7689. 
  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. doi:10.3847/1538-4365/ac4157. Bibcode: 2022ApJS..258...29C. 
  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. http://www.cbat.eps.harvard.edu/iauc/06400/06437.html#Item1. 
  8. ↑ "SN 1996al". IAU. https://www.wis-tns.org/object/1996al. 

Coordinates: Sky map 23h 33m 16.7309s, −54° 05′ 39.692″



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