| NGC 633 | |
|---|---|
 The galaxy, as seen by theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Constellation | Sculptor |
| Right ascension | 01h 36m 23.4128s[1] |
| Declination | −37° 19′ 17.647″[1] |
| Redshift | 0.017305[1] |
| Heliocentric radial velocity | 5188 ± 11 km/s[1] |
| Apparent magnitude (B) | 13.5 |
| Surface brightness | 22.37 mag/arcsec2 |
| Characteristics | |
| Type | SB(r)b:[1] |
| Other designations | |
| MCG -06-04-056,PGC 5960[1] | |
NGC 633 is a largebarred spiral galaxy located in theconstellation Sculptor. Its speed relative to thecosmic microwave background is 4,979 ± 18 km/s, which corresponds to aHubble distance of 73.4 ± 5.2 Mpc (~239 millionly).[1] NGC 633 was discovered by BritishastronomerJohn Herschel in 1834.
Theluminosity class of NGC 633 is II and it has a broad HI line. It also contains regions ofionized hydrogen.[1]
The smaller galaxy to the south of NGC 633 isPGC 5959 orESO 297-012, and these two galaxies form agalactic pair.[2] The Hubble distance of ESO 297-012 is 73.51 ± 5.15,[3] which is almost identical to that of NGC 633, confirming that both galaxies are in gravitational interaction.[4] A contrast-enhanced image shows a bridge of matter between these two galaxies.[4]