NGC 1643

NGC 1643
NGC 1643 imaged by SDSS
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension04h 43m 43.9330s[1]
Declination−05° 19′ 09.562″[1]
Redshift0.016261±0.00000900[1]
Heliocentric radial velocity4,875±3 km/s[1]
Distance232.5 ± 16.3 Mly (71.30 ± 4.99 Mpc)[1]
Apparent magnitude (V)14[1]
Characteristics
TypeSB(r)bc pec[1]
Size~75,100 ly (23.02 kpc) (estimated)[1]
Apparent size (V)1.1′ × 1.1′[1]
Other designations
IRAS 04412-0524, MCG -01-13-001, PGC 15891[1]

NGC 1643 is a peculiar barred spiral galaxy in the constellation of Eridanus. Its velocity with respect to the cosmic microwave background is 4,834±4 km/s, which corresponds to a Hubble distance of 232.5 ± 16.3 Mly (71.30 ± 4.99 Mpc).[1] It was discovered by German-British astronomer William Herschel on 28 November 1786.[2]

Supernovae

Two supernovae have been observed in NGC 1643:

  • SN 1995G (Type IIn, mag. 15.5) was discovered by Robert Evans, J. Shobbrook, and S. Beaman, on 23 February 1995.[3][4]
  • SN 1999et (Type II, mag. 17.6) was discovered by E. Cappellaro on 4 November 1999.[5][6]

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 "Results for object NGC 1643". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 22 August 2025.
  2. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 1643". Celestial Atlas. Retrieved 22 August 2025.
  3. ↑ Evans, R. O.; Shobbrook, J.; Beaman, S.; Cass, P. (1 February 1995). "Supernova 1995G in NGC 1643". International Astronomical Union Circular (6138): 2. Bibcode:1995IAUC.6138....2E.
  4. ↑ "SN 1995G". Transient Name Server. IAU. Retrieved 22 August 2025.
  5. ↑ Cappellaro, E. (1 November 1999). "Supernova 1999et in NGC 1643". International Astronomical Union Circular (7304): 1. Bibcode:1999IAUC.7304....1C.
  6. ↑ "SN 1999et". Transient Name Server. IAU. Retrieved 22 August 2025.
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