NGC 2642 is a barred spiral galaxy in the constellation of Hydra. Its velocity with respect to the cosmic microwave background is 4632 ± 21 km/s, which corresponds to a Hubble distance of 68.32 ± 4.79 Mpc (∼223 million light-years).[1] It was discovered by British astronomer John Herschel on 19 February 1830.[2]
| NGC 2642 | |
|---|---|
 The barred spiral galaxy NGC 2642. | |
| Observation data (J2000 epoch) | |
| Constellation | Hydra |
| Right ascension | 08h 44m 37.0s[1] |
| Declination | −04° 07′ 18.2″[1] |
| Redshift | 0.014473 [1] |
| Heliocentric radial velocity | 4339 ± 5 km/s[1] |
| Distance | 222.8 ± 15.6 Mly (68.32 ± 4.79 Mpc)[1] |
| Apparent magnitude (V) | 12.6[1] |
| Characteristics | |
| Type | SB(r)bc[1] |
| Size | ~140,800 ly (43.17 kpc) (estimated)[1] |
| Apparent size (V) | 2.0' x 1.8'[1] |
| Other designations | |
| PGC 24395, MCG -01-22-033, IRAS 08382-0356, 2MASX J08404435-0407182[1] | |
According to the SIMBAD database, NGC 2642 is a Seyfert I galaxy, i.e. it has a quasar-like nuclei with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.[3]
Three supernovae have been observed in NGC 2642: SN 2002fj (type IIn, mag. 15.8),[4] SN 2008bh (type II, mag. 16.3),[5] and SN 2023aaby (type Ic, mag. 17.9).[6]
See also
editReferences
edit- ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 2642. Retrieved 9 August 2024.
- ^ Seligman, Courtney. "NGC 2642". Celestial Atlas. Retrieved 9 August 2024.
- ^ "SIMBAD astronomical database". Entry for NGC 2642. Retrieved 9 August 2024.
- ^ "Transient Name Server". Entry for SN 2002fj. Retrieved 9 August 2024.
- ^ "Transient Name Server". Entry for SN 2008bh. Retrieved 9 August 2024.
- ^ "Transient Name Server". Entry for SN 2023aaby. Retrieved 9 August 2024.
External links
edit
Media related to NGC 2642 at Wikimedia Commons- NGC 2642 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
