NGC 2251
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| SDSS recording | |
| AladinLite | |
| Constellation | unicorn |
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Position equinox : J2000.0 |
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|---|---|
| Right ascension | 06 h 34 m 38.5 s |
| declination | + 08 ° 21 ′ 59 ″ |
| Appearance
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| classification | III2p |
| Brightness (visual) | 7.3 likes |
| Angular expansion | 10 |
| Physical data
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| Affiliation | Milky Way |
| distance | 4300 ly (1329 pc ) |
| history | |
| Discovered by | William Herschel |
| Discovery time | December 26, 1783 |
| Catalog names | |
| NGC 2251 • C 0632 + 084 • OCl 499 • Cr 101 • Lund 232 • GC 1429 • H VIII 3 • h 395 • | |
NGC 2251 is a galactic open star cluster of the Trumpler type III2p in the constellation Monoceros north of the celestial equator . It has a diameter of 10 arc minutes and an apparent magnitude of 7.3 mag.
The object was discovered on December 26, 1783 by William Herschel .