Astronomy:NGC 2642
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| NGC 2642 | |
|---|---|
 NGC 2642 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Hydra |
| Right ascension | 08h 40m 44.3818s[1] |
| Declination | −04° 07′ 18.011″[1] |
| Redshift | 0.014473[1] |
| Helio 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′ × 1.8′[1] |
| Other designations | |
| IRAS 08382-0356, MCG-01-22-033, PGC 24395[1] | |
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]
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]
Supernovae
Three supernovae have been observed in NGC 2642:
- SN 2002fj (Type IIn, mag. 15.8) was discovered by Libert "Berto" Monard on 12 September 2002.[4][5]
- SN 2008bh (Type II, mag. 16.3) was discovered by the Lick Observatory Supernova Search (LOSS) and by The CHilean Automatic Supernova sEarch (CHASE) on 23 March 2008.[6][7]
- SN 2023aaby (Type Ic, mag. 17.943) was discovered by ATLAS on 14 December 2023.[8]
See also
References
- ↑ 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 2642". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+2642.
- ↑ Seligman, Courtney. "NGC 2642". https://cseligman.com/text/atlas/ngc26.htm#2642.
- ↑ "NGC 2642". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+2642.
- ↑ Monard, L. A. G.; Africa, S. (2002). "Supernova 2002fj in NGC 2642". International Astronomical Union Circular (7973): 1. Bibcode: 2002IAUC.7973....1M. http://www.cbat.eps.harvard.edu/iauc/07900/07973.html#Item1.
- ↑ "SN 2002fj". IAU. https://www.wis-tns.org/object/2002fj.
- ↑ Narla, A.; Li, W.; Filippenko, A. V.; Pignata, G.; Maza, J.; Hamuy, M.; Antezana, R.; Gonzalez, L. et al. (2008). "Supernova 2008bh in NGC 2642". Central Bureau Electronic Telegrams 1311: 1. Bibcode: 2008CBET.1311....1N. http://www.cbat.eps.harvard.edu/cbet/001300/CBET001311.txt.
- ↑ "SN 2008bh". IAU. https://www.wis-tns.org/object/2008bh.
- ↑ "SN 2023aaby". IAU. https://www.wis-tns.org/object/2023aaby.
External links
- NGC 2642 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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