Arp 104
| Arp 104 | |
|---|---|
NGC 5216: The Keenan System, Arp 104 | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 13h 32m 08.9s |
| Declination | +62° 44′ 02″ |
| Redshift | 0.010817 |
| Distance | 1.73 × 107 |
| Apparent magnitude (V) | 14.0/12.3 |
| Characteristics | |
| Type | E0/SBb-pec |
| Notable features | bridged |
| Other designations | |
| Keenan's system NGC 5216/NGC 5218 | |
Arp 104, also known as Keenan's system, is entry 104 in Halton Arp's Atlas of Peculiar Galaxies catalog for spiral galaxy NGC 5216 and globular galaxy NGC 5218. The two galaxies are joined by a bridge of galactic material spanning 22 000 light years.
In 1790 William Herschel discovered the galaxies, and in 1926 they were studied by Edwin Hubble. In 1935 Philip C. Keenan first published a paper about the bridge connecting the galaxies, which was rediscovered in 1958 at the Lick and Palomar observatories.