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)
ConstellationHydra
Right ascension08h 44m 37.0s[1]
Declination−04° 07′ 18.2″[1]
Redshift0.014473 [1]
Heliocentric radial velocity4339 ± 5 km/s[1]
Distance222.8 ± 15.6 Mly (68.32 ± 4.79 Mpc)[1]
Apparent magnitude (V)12.6[1]
Characteristics
TypeSB(r)bc[1]
Size~140,800 ly (43.17 kpc) (estimated)[1]
Apparent size (V)2.0' x 1.8'[1]
Other designations
IRAS 08382-0356, 2MASX J08404435-0407182, MCG -01-22-033, PGC 24395[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

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References

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  1. ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 2642. Retrieved 9 August 2024.
  2. ^ Seligman, Courtney. "NGC 2642". Celestial Atlas. Retrieved 9 August 2024.
  3. ^ "SIMBAD astronomical database". Entry for NGC 2642. Retrieved 9 August 2024.
  4. ^ "Transient Name Server". Entry for SN 2002fj. Retrieved 9 August 2024.
  5. ^ "Transient Name Server". Entry for SN 2008bh. Retrieved 9 August 2024.
  6. ^ "Transient Name Server". Entry for SN 2023aaby. Retrieved 9 August 2024.
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