Beta Cassiopeiae
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 09m 10.7s |
| Declination | +59° 08′ 59″ |
| Apparent magnitude (V) | +2.28 (2.25–2.31) |
| Characteristics | |
| Spectral type | F2 III-IV |
| U-B color index | 0.11 |
| B-V color index | 0.34 |
| Variable type | Delta Scuti |
| Astrometry | |
| Radial velocity (Rv) | 11.3 km/s |
| Proper motion (μ) | RA: 523.39 mas/yr Dec.: -180.42 mas/yr |
| Parallax (π) | 69.5 ± 6.6 mas |
| Distance | 47 ± 4 ly (14 ± 1 pc) |
| Absolute magnitude (MV) | +1.16 |
| Details | |
| Mass | 2 M☉ |
| Radius | 4 R☉ |
| Luminosity | 28 L☉ |
| Temperature | 6,700 K |
| Metallicity | ? |
| Rotation | 70 km/s. |
| Age | ? years |
| Other designations | |
Beta Cassiopeiae (β Cas / β Cassiopeiae) is a Delta Scuti variable star in the constellation Cassiopeia. It has the traditional name Caph, from the Arabic word كف kaf, "palm" (i.e. reaching from the Pleiades), also known as al-Sanam al-Nakah. Another Arabic name is al-Kaff al-Khadib.[1]
β Cassiopeiae is a yellow-white F-type giant with a mean apparent magnitude of +2.28. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +2.25 to +2.31 with a period of 2.5 hours. The Caph star is known to be double the size of the sun and seen to be 28 times brighter.
[edit] External links
- ^ Kennedy, E.S.; Kunitzsch, P.; Lorch, R.P. (1999), http://books.google.co.uk/books?hl=en
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