Rho 2 Cephei
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Star ρ 2 Cephei |
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| AladinLite | |||||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Cepheus | ||||||||||||||||||
| Right ascension | 22 h 29 m 53 s | ||||||||||||||||||
| declination | + 78 ° 49 ′ 27 ″ | ||||||||||||||||||
| Apparent brightness | 5.46 likes | ||||||||||||||||||
| Typing | |||||||||||||||||||
| Spectral class | A2 V | ||||||||||||||||||
| Astrometry | |||||||||||||||||||
| parallax | (13.31 ± 0.21) mas | ||||||||||||||||||
| distance | (245 ± 4) ly (75.1 ± 1.2) pc |
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| Physical Properties | |||||||||||||||||||
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Other names and catalog entries |
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ρ 2 Cephei ( Rho 2 Cephei ) is a main sequence star of the spectral class A3 with an apparent magnitude of 5.5 mag. It lies in the constellation Cepheus and is about 245 light years away ; its projected speed of rotation is v · sin (i) = 120 km / s.
The star bears the historical proper name Al Kalb al Rai ( Arabic الكلب الراعي, DMG al-kalb ar-rāʿī , shepherd dog ').
Web links
Individual evidence
- ↑ a b Abt, Morell: The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars. bibcode : 1995ApJS ... 99..135A