| Arp 251 | |
|---|---|
 | |
| Observation data (Epoch J2000) | |
| Constellation(s) | Cetus |
| Right ascension | 00h53m |
| Declination | -13°51' |
| Number of galaxies | 3 |
| See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters | |
Arp 251 is a group of three spiral galaxies. The galaxies (2MASX J00534840-1351148, 2MASX J00534765-1351358 and 2MASX J00533671-1349541) are visible in the constellation Cetus.[1] Arp 251 is cataloged in the Atlas of Peculiar Galaxies,[2] which is a catalog of unusual galaxies put into groups based on purely morphological criteria. Arp 251 belongs to the class of galaxies with signs of splitting.[3]
Source:[4]
2MASX J00534 is the northernmost galaxy in Arp 251. It spans 30 arc-seconds in apparent view, which corresponds to a diameter of 170,000 light years. The upper arm is disturbed, meaning that galaxy interaction may be present.
2MASX J005347 is the southernmost galaxy out of the triplet and has a magnitude of 15.1. It's visual magnitude is unknown.
2MASX J005446 has a magnitude of 16.4 and a redshift distance of 700 million+ light-years. It has a larger angular size than the other galaxies making up Arp 251.
