| NGC 646 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Hydrus |
| Right ascension | 01h 37m 25.5s[1] |
| Declination | −64° 53′ 47″[1] |
| Distance | 392 Mly |
| Apparent magnitude (B) | 15.65 |
| Surface brightness | 22.53 mag/arcsec2 |
| Characteristics | |
| Type | SAB(s)c pec?[1] |
| Other designations | |
| PGC 6010[1] | |
NGC 646 is a large barred spiral galaxy located in the constellation Hydrus.[2] Its speed relative to the cosmic microwave background is 8,145 ± 19 km/s, which corresponds to a Hubble distance of 120.1 ± 8.4 Mpc (~392 million ly). NGC 646 was discovered by British astronomer John Herschel in 1834.[3] It forms an interacting galaxy pair.[4]
- ^ a b c d Cite error: The named reference
NEDwas invoked but never defined (see the help page). - ^ "NGC 646 NED02 - Elliptical/Spiral Galaxy in Hydrus | TheSkyLive.com". theskylive.com. Retrieved 2024-04-15.
- ^ "New General Catalog Objects: NGC 600 - 649". cseligman.com. Retrieved 2024-04-18.
- ^ Danziger, I. J.; Schuster, H. -E. (1974-08-01). "The interacting galaxy system NGC 646". Astronomy and Astrophysics. 34: 301–303. Bibcode:1974A&A....34..301D. ISSN 0004-6361.