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). 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:

  • SN 1996al (TypeII, mag. 14.0) was discovered by Robert Evans, R. Benton, and S. Beaman on 22 July 1996.

Image gallery

See also

External links

  • Media related to NGC 7689 at Wikimedia Commons
  • NGC 7689 on WikiSky: , , , , , , , ,