Arp 104
| Arp 104 | |
|---|---|
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File:NGC 5216 from the Schulman 0.8m Telescope at the Mount Lemmon Skycenter courtesy Adam Block.jpg
NGC 5216: The Keenan System, Arp 104
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| Observation data (J2000[1] epoch) | |
| Constellation | Ursa Major[2] |
| Right ascension | 13h 32m 08.9s[1] |
| Declination | +62° 44′ 02″[1] |
| Redshift | 0.010817[1] |
| Distance | 1.73 × 107[2][3] |
| Type | E0/SBb-pec[4] |
| Apparent magnitude (V) | 14.0[5]/12.3[6] |
| Notable features | bridged[2] |
| Other designations | |
| Keenan's system[1][2] NGC 5216/NGC 5218[1][2] |
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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.[2] The two galaxies are joined by a bridge of galactic material spanning 22 000 light years.[2][3]
In 1790 William Herschel discovered the galaxies, and in 1926 they were studied by Edwin Hubble.[2] In 1935 Philip C. Keenan first published a paper about the bridge connecting the galaxies,[2][10] which was rediscovered in 1958 at the Lick and Palomar observatories.[2][3][11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
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External links
- Astronomy Picture of the Day
- Galaxies on a String - 2008 July 31
- Galaxies on a String - 2010 July 2
Coordinates: 
13h 32m 08.9s, +62° 44′ 02″
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