NGC 633

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. NGC 633 was discovered by British astronomer John Herschel in 1834.
The luminosity class of NGC 633 is II and it has a broad HI line. It also contains regions of ionized hydrogen.
The smaller galaxy to the south of NGC 633 is PGC 5959 or ESO 297-012, and these two galaxies form a galactic pair. The Hubble distance of ESO 297-012 is 73.51 ± 5.15, which is almost identical to that of NGC 633, confirming that both galaxies are in gravitational interaction. A contrast-enhanced image shows a bridge of matter between these two galaxies.