| NGC673 | |
| Constellation Name: | Aries |
| Epoch: | J2000 |
| Type: | SAB(s)c[1] |
| Dist Ly: | NaNMpc |
| Group Cluster: | IC 1723 group |
| Z: | 0.017289 |
| H Radial V: | 5183 ± 1 km/s |
| Appmag V: | 12.6 |
| Size: | ~42.27kpc (estimated) |
NGC673 is an intermediate spiral galaxy in the constellation of Aries. Its velocity with respect to the cosmic microwave background is 4894 ± 20km/s, which corresponds to a Hubble distance of NaNMpc. In addition, 31 non redshift measurements give a distance of NaNabbr=onNaNabbr=on.[2] The galaxy was discovered by German-British astronomer William Herschel on 4 September 1786.[3]
According to A.M. Garcia, NGC 673 is the namesake of the NGC 673 Group (also known as LGG 31). This group contains at least 17 galaxies, including IC 156, IC 162, NGC 665, NGC 677, NGC 683, and 11 galaxies from the UGC catalogue.[4]
Two supernovae have been observed in NGC 673. British amateur astronomer Mark Armstrong, K. Okazaki, Kahoku-machi, and Yamagata-ken discovered SN1996bo (typeIa, mag. 16.5) on 18 October 1996.[5] M. Papenkova and W. D. Li discovered SN2001fa (typeIIn, mag. 16.9) on 18 October 2001.[6]