Astronomy:NGC 1643
From HandWiki
| NGC 1643 | |
|---|---|
 NGC 1643 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Eridanus |
| Right ascension | 04h 43m 43.9330s[1] |
| Declination | −05° 19′ 09.562″[1] |
| Redshift | 0.016261±0.00000900[1] |
| Helio radial velocity | 4,875±3 km/s[1] |
| Distance | 232.5 ± 16.3 Mly (71.30 ± 4.99 Mpc)[1] |
| Apparent magnitude (V) | 14[1] |
| Characteristics | |
| Type | SB(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
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 1643". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+1643.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 1643". https://cseligman.com/text/atlas/ngc16.htm#1643.
- ↑ Evans, R. O.; Shobbrook, J.; Beaman, S.; Cass, P. (1995-02-01). "Supernova 1995G in NGC 1643". International Astronomical Union Circular (6138): 2. Bibcode: 1995IAUC.6138....2E. http://www.cbat.eps.harvard.edu/iauc/06100/06138.html#item2.
- ↑ "SN 1995G". IAU. https://www.wis-tns.org/object/1995G.
- ↑ Cappellaro, E. (1999-11-01). "Supernova 1999et in NGC 1643". International Astronomical Union Circular (7304): 1. Bibcode: 1999IAUC.7304....1C. http://www.cbat.eps.harvard.edu/iauc/07300/07304.html#Item1.
- ↑ "SN 1999et". IAU. https://www.wis-tns.org/object/1999et.
External links
- NGC 1643 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
04h 43m 43.9330s, −05° 19′ 09.562″
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