| NGC 7253 | |
|---|---|
 The spiral galaxy pair NGC 7253 by thePan-STARRS survey. | |
| Observation data (J2000epoch) | |
| Constellation | Pegasus |
| Right ascension | 22h 19m 28.9s[1] |
| Declination | 29° 23′ 30.0″[1] |
| Redshift | 0.015738[1] |
| Heliocentric radial velocity | 4718 km/s[1] |
| Distance | 203.7 Mly (62.46 Mpc) & 200.4 Mly (61.43 Mpc)[1] |
| Apparent magnitude (V) | 13.2 & 14.3[1] |
| Characteristics | |
| Type | Double System[1] |
| Size | ~135,000 ly (41.40 kpc) & 71,400 ly (21.88 kpc) (estimated)[1] |
| Apparent size (V) | 1.7' x 0.8' & 1.6' x 0.5'[1] |
| Other designations | |
| Arp 278,UGC 11984 & 11985,MCG +05-52-010 & +05-52-011,PGC 68572 & 68573,CGCG 494-014,VV 242[1] | |
NGC 7253 is a pair ofspiral galaxies in theconstellationPegasus. It was discovered by theGerman-British astronomerAlbert Marth on 9 September 1863.[2] It is listed inHalton Arp'sAtlas of Peculiar Galaxies as Arp 278, as an example ofgravitationally interacting galaxies.[3]
Of the pair, the galaxy to the north is known individually as NGC 7253A. Its velocity relative to thecosmic microwave background is 4,235 ± 24 km/s, which corresponds to aHubble distance of 62.5 ± 4.4 Mpc (~204 millionlight-years).[1] The other galaxy in the pair is known individually as NGC 7253B. Its velocity relative to the cosmic microwave background is 4,165 ± 24 km/s, which corresponds to a Hubble distance of 61.4 ± 4.3 Mpc (~200 million light-years).[1]
With asurface brightness equal to 14.06Mag/arcsec2, NGC 7253B can be described as alow surface brightness galaxy.
According to theSimbad database, NGC 7253 is a candidate for the title ofactive galaxy nucleus.[4]
Onesupernova has been observed in NGC 7253B: SN 2002jg (type Ia, mag. 17) was discovered by Mike Schwartz and LOTOSS (Lick Observatory andTenagra Observatory Supernova Searches) on 23 November 2002.[5][6]
Media related toNGC 7253 at Wikimedia Commons