NGC 2642

NGC 2642
The barred spiral galaxy NGC 2642
Observation data (J2000 epoch)
Constellation	Hydra
Right ascension	08^h 40^m 44.3818^s[1]
Declination	−04° 07′ 18.011″[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′ × 1.8′[1]
Other designations
IRAS 08382-0356, 2MASX J08404435-0407182, 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

• List of NGC objects (2001–3000)

References

1. "Results for NGC 2642". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 9 August 2024.
2. Seligman, Courtney. "NGC 2642". Celestial Atlas. Retrieved 9 August 2024.
3. "NGC 2642". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 December 2024.
4. Monard, L. A. G.; Africa, S. (2002). "Supernova 2002fj in NGC 2642". International Astronomical Union Circular (7973): 1. Bibcode:2002IAUC.7973....1M.
5. "SN 2002fj". Transient Name Server. IAU. Retrieved 16 December 2024.
6. Narla, A.; Li, W.; Filippenko, A. V.; Pignata, G.; Maza, J.; Hamuy, M.; Antezana, R.; Gonzalez, L.; Lopez, P.; Silva, S.; Folatelli, G.; Reichart, D.; Ivarsen, K.; Crain, A.; Foster, D.; Nysewander, M.; Lacluyze, A. (2008). "Supernova 2008bh in NGC 2642". Central Bureau Electronic Telegrams. 1311: 1. Bibcode:2008CBET.1311....1N.
7. "SN 2008bh". Transient Name Server. IAU. Retrieved 16 December 2024.
8. "SN 2023aaby". Transient Name Server. IAU. Retrieved 16 December 2024.

External links

• 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