NGC 633

{{Infobox galaxy

|image=NGC633 - HST 10169 02R1600GB1100.png

|name=NGC 633

|caption=The galaxy, as seen by the Hubble Space Telescope

|constellation name=Sculptor

|ra={{RA|01|36|23.4128}}

|dec={{DEC|-37|19|17.647}}

|epoch=J2000

|appmag_b=13.5

|sbrightness=22.37 mag/arcsec²

|type=SB(r)b:

|z=0.017305

|h_radial_v=5188 ± 11 km/s

|names={{odlist | MCG=-06-04-056 | PGC=5960 }}

}}

{{Short description|Large barred spiral galaxy in the constellation Sculptor}}

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).{{Cite web |title=By Name {{!}} NASA/IPAC Extragalactic Database |url=http://ned.ipac.caltech.edu/byname?objname=NGC+633&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1 |access-date=2024-07-23 |website=ned.ipac.caltech.edu}} 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.{{cite arXiv | eprint=astro-ph/9410092 | last1=Soares | first1=D. S. L. | last2=de Souza | first2=R. E. | last3=de Carvalho | first3=R. R. | last4=Couto da Silva | first4=T. C. | title=Southern Binary Galaxies. I. A Sample of Isolated Pairs | date=1994 }} The Hubble distance of ESO 297-012 is 73.51 ± 5.15,{{Cite web |title=By Name {{!}} NASA/IPAC Extragalactic Database |url=https://ned.ipac.caltech.edu/byname?objname=ESO+297-G+012&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1 |access-date=2024-07-23 |website=ned.ipac.caltech.edu}} which is almost identical to that of NGC 633, confirming that both galaxies are in gravitational interaction.{{Cite web |title=New General Catalog Objects: NGC 600 - 649 |url=https://cseligman.com/text/atlas/ngc6.htm |access-date=2024-07-23 |website=cseligman.com}} A contrast-enhanced image shows a bridge of matter between these two galaxies.