NGC 1620

NGC 1620
The spiral galaxy NGC 1620
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension04h 36m 37.3764s[1]
Declination−00° 08′ 36.81″[1]
Redshift0.011715[1]
Heliocentric radial velocity3512 ± 1 km/s[1]
Distance166.2 ± 11.6 Mly (50.97 ± 3.57 Mpc)[1]
Group or clusterNGC 1589 Group (LGG 117)
Apparent magnitude (V)12.3[1]
Characteristics
TypeSAB(rs)bc[1]
Size~121,000 ly (37.11 kpc) (estimated)[1]
Apparent size (V)2.9' x 1.0'[1]
Other designations
IRAS 04340-0014, 2MASX J04363734-0008370, UGC 3103, MCG +00-12-052, PGC 15638[1]

NGC 1620 is an intermediate spiral galaxy in the constellation of Eridanus. Its velocity with respect to the cosmic microwave background is 3,455 ± 4 km/s, which corresponds to a Hubble distance of 166.2 ± 11.6 Mly (50.97 ± 3.57 Mpc).[1] However, 20 non-redshift measurements give a closer distance of 130.02 ± 3.26 Mly (39.865 ± 1.001 Mpc).[2] It was discovered by German-British astronomer William Herschel on 1 January 1786.

Supernovae

Two supernovae have been observed in NGC 1620:

  • SN 2009K (type IIb, mag. 14.9) was discovered by CHASE (CHilean Automatic Supernovas sEarch) on 14 January 2009.[3][4]
  • SN 2023crx (type Ib, mag. 18.6) was discovered by the Gaia Photometric Science Alerts on 1 March 2023.[5]

NGC 1589 Group

According to A.M. Garcia, the galaxy NGC 1620 is part of the NGC 1589 Group (also known as LGG 117) that includes at least 8 other galaxies: NGC 1586, NGC 1587, NGC 1588, NGC 1589, UGC 3054, UGC 3058, UGC 3072 and UGC 3080.[6]

See also

References

  1. ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 1620. Retrieved 24 July 2024.
  2. ^ "Distance Results for NGC 1620". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved 13 December 2024.
  3. ^ Pignata, G.; Maza, J.; Hamuy, M.; Antezana, R.; Gonzalez, L.; Gonzalez, P.; Lopez, P.; Silva, S.; Folatelli, G.; Iturra, D.; Cartier, R.; Forster, F.; Marchi, S.; Conuel, B.; Reichart, D.; Ivarsen, K.; Crain, A.; Foster, D.; Nysewander, M.; Lacluyze, A. (2009). "Supernova 2009K in NGC 1620". Central Bureau Electronic Telegrams. 1663: 1. Bibcode:2009CBET.1663....1P.
  4. ^ "SN 2009K". Transient Name Server. IAU. Retrieved 13 December 2024.
  5. ^ "SN 2023crx". Transient Name Server. IAU. Retrieved 13 December 2024.
  6. ^ 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.

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