| NGC 7253 | |
| Constellation Name: | Pegasus |
| Epoch: | J2000 |
| Type: | Double System[1] |
| Dist Ly: | 62.46Mpc & 61.43Mpc |
| Z: | 0.015738 |
| H Radial V: | 4718 km/s |
| Appmag V: | 13.2 & 14.3 |
| Size V: | 1.7' x 0.8' & 1.6' x 0.5' |
| Size: | ~41.4kpc & 21.88kpc (estimated) |
NGC 7253 is a pair of spiral galaxies in the constellation Pegasus. It was discovered by the German-British astronomer Albert Marth on 9 September 1863.[2] It is listed in Halton Arp's Atlas of Peculiar Galaxies as Arp278, as an example of gravitationally interacting galaxies.[3]
Of the pair, the galaxy to the north is known individually as NGC7253A. Its velocity relative to the cosmic microwave background is 4,235 ± 24km/s, which corresponds to a Hubble distance of 62.5 ± 4.4Mpc (∼204million light-years). The other galaxy in the pair is known individually as NGC7253B. Its velocity relative to the cosmic microwave background is 4,165 ± 24km/s, which corresponds to a Hubble distance of 61.4 ± 4.3Mpc (∼200million light-years).
With a surface brightness equal to 14.06 Mag/arcsec2, NGC7253B can be described as a low surface brightness galaxy.
According to the Simbad database, NGC7253 is a candidate for the title of active galaxy nucleus.[4]
One supernova has been observed in NGC7253B: SN2002jg (type Ia, mag.17).[5]