| NGC 7408 | |
|---|---|
 NGC 7408 imaged by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Tucana |
| Right ascension | 22h 55m 56.8877s[1] |
| Declination | −63° 41′ 40.732″[1] |
| Redshift | 0.011656±0.0000310[1] |
| Heliocentric radial velocity | 3,494±9 km/s[1] |
| Distance | 142.80 ± 5.67 Mly (43.783 ± 1.739 Mpc)[1] |
| Group or cluster | NGC 7329 group (LGG 462) |
| Apparent magnitude (V) | 13.33[1] |
| Characteristics | |
| Type | SB(s)cd[1] |
| Size | ~86,200 ly (26.42 kpc) (estimated)[1] |
| Apparent size (V) | 1.5′ × 1.2′[1] |
| Other designations | |
| ESO 109- G 026, IRAS 22527-6357, 2MASX J22555688-6341411, PGC 070037[1] | |
NGC 7408 is a barred spiral galaxy in the constellation of Tucana. 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).[1] However, 12 non-redshift measurements give a closer mean distance of 142.80 ± 5.67 Mly (43.783 ± 1.739 Mpc).[2] It was discovered by British astronomer John Herschel on 1 November 1834.[3][4]
NGC 7408 is 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.[5][6]
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.[7][8]
Supernovae
Two supernovae have been observed in NGC 7408:
- SN 2007bn (type unknown, mag. 17) was discovered by R. Martin and the Perth Observatory Automated Supernova Search on 18 April 2007.[9][10]
- SN 2009bu (Type II-P, mag. 16.4) was discovered by Alessandro Dimai on 25 March 2009.[11][12]
See also
References
- ^ a b c d e f g h i j k "Results for object NGC 7408". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 22 December 2025.
- ^ "Distance Results for NGC 7408". NASA/IPAC Extragalactic Database. NASA. Retrieved 22 December 2025.
- ^ 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.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 7408". Celestial Atlas. Retrieved 22 December 2025.
- ^ 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.
- ^ "NGC 7408". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 December 2025.
- ^ 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.
- ^ "LGG 462". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 December 2025.
- ^ Martin, R. (2007). "Supernova 2007bn in NGC 7408". Central Bureau Electronic Telegrams (940): 1. Bibcode:2007CBET..940....1M.
- ^ "SN 2007bn". Transient Name Server. IAU. Retrieved 22 December 2025.
- ^ Dimai, A. (2009). "Supernova 2009bu in NGC 7408". Central Bureau Electronic Telegrams (1740): 1. Bibcode:2009CBET.1740....1D.
- ^ "SN 2009bu". Transient Name Server. IAU. Retrieved 22 December 2025.
External links
- NGC 7408 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
