NGC 7408

NGC 7408
NGC 7408 imaged by Legacy Surveys
Observation data (J2000 epoch)
ConstellationTucana
Right ascension22h 55m 56.8877s
Declination−63° 41′ 40.732″
Redshift0.011656±0.0000310
Heliocentric radial velocity3,494±9 km/s
Distance142.80 ± 5.67 Mly (43.783 ± 1.739 Mpc)
Group or clusterNGC 7329 group (LGG 462)
Apparent magnitude (V)13.33
Characteristics
TypeSB(s)cd
Size~86,200 ly (26.42 kpc) (estimated)
Apparent size (V)1.5′ × 1.2′
Other designations
ESO 109- G 026, IRAS 22527-6357, 2MASX J22555688-6341411, PGC 070037

NGC 7408 is a barred spiral galaxy in the constellation of Tucana. It has an apparent visual magnitude of 13.33 and an angular size of 1.5′ × 1.2′. Its velocity with respect to the cosmic microwave background is 3,372±13 km/s, which corresponds to a Hubble distance of 162.2 ± 11.4 Mly (49.73 ± 3.49 Mpc). However, 12 non-redshift measurements give a closer mean distance of 142.80 ± 5.67 Mly (43.783 ± 1.739 Mpc). It was discovered by British astronomer John Herschel on 1 November 1834.

The morphological classification of NGC 7408 is SB(s)cd, indicating a barred spiral form (SB) with no ring structure (s) and closely wound spiral arms (cd). It a Seyfert II galaxy, it has a quasar-like nucleus with very high surface brightness whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

NGC 7329 group

NGC 7408 is a member of the NGC 7329 group (also known as LGG 462). This group contains at least 11 galaxies, including NGC 7329, NGC 7358, NGC 7417, IC 5222, IC 5227, IC 5244, IC 5250, IC 5266, IC 5272, and ESO 109-32.

Supernovae

Two supernovae have been observed in NGC 7408:

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 "Results for object NGC 7408". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 22 December 2025.
  2. ↑ "Distance Results for NGC 7408". NASA/IPAC Extragalactic Database. NASA. Retrieved 22 December 2025.
  3. ↑ Herschel, J. F. W (1864). "Catalogue of Nebulae and Clusters of Stars". Philosophical Transactions of the Royal Society of London. 154: 1–137. Bibcode:1864RSPT..154....1H. doi:10.1098/rstl.1864.0001.
  4. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 7408". Celestial Atlas. Retrieved 22 December 2025.
  5. ↑ 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.
  6. ↑ "NGC 7408". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 December 2025.
  7. ↑ 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.
  8. ↑ "LGG 462". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 December 2025.
  9. ↑ Martin, R. (2007). "Supernova 2007bn in NGC 7408". Central Bureau Electronic Telegrams (940): 1. Bibcode:2007CBET..940....1M.
  10. ↑ "SN 2007bn". Transient Name Server. IAU. Retrieved 22 December 2025.
  11. ↑ Dimai, A. (2009). "Supernova 2009bu in NGC 7408". Central Bureau Electronic Telegrams (1740): 1. Bibcode:2009CBET.1740....1D.
  12. ↑ "SN 2009bu". Transient Name Server. IAU. Retrieved 22 December 2025.