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Large barred spiral galaxy in the constellation Sculptor From Wikipedia, the free encyclopedia
NGC 633 is a large barred spiral galaxy located in the constellation Sculptor. Its speed relative to the cosmic microwave background is 4,979 ± 18 km/s, which corresponds to a Hubble distance of 73.4 ± 5.2 Mpc (∼239 million ly).[1] NGC 633 was discovered by British astronomer John Herschel in 1834.
NGC 633 | |
---|---|
![]() The galaxy, as seen by the Hubble Space Telescope | |
Observation data (J2000 epoch) | |
Constellation | Sculptor |
Right ascension | 01h 36m 23s |
Declination | -37° 19’ 18” |
Apparent magnitude (B) | 13.5 |
Surface brightness | 22.37 mag/arcsec^2 |
Characteristics | |
Type | SBb |
The luminosity class of NGC 633 is II and it has a broad HI line. It also contains regions of ionized hydrogen.[1]
The smaller galaxy to the south of NGC 633 is PGC 5959 or ESO 297-012, and these two galaxies form a galactic 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]
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