6 Cassiopeiae
 Location of 6 Cassiopeiae (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h 48m 50.171s |
| Declination | +62° 12′ 52.26″ |
| Apparent magnitude (V) | +5.43(5.34 - 5.45) |
| Characteristics | |
| Spectral type | A2.5 Ia+ |
| U−B color index | −0.02 |
| B−V color index | +0.67 |
| Variable type | α Cyg |
| Astrometry | |
| Proper motion (μ) |
RA: −3.57 ± 0.35 mas/yr Dec.: −1.57 ± 0.33 mas/yr |
| Parallax (π) | 0.53 ± 0.37mas |
| Distance | 2,510pc |
| Absolute magnitude (MV) | −8.30 |
| Details | |
| Mass | 22.0 M☉ |
| Radius | 217 R☉ |
| Luminosity | 200,000 L☉ |
| Surface gravity (log g) | 1.59 cgs |
| Temperature | 10,023 ± 227 K |
| Rotational velocity (v sin i) | 50 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
6 Cassiopeiae (6 Cas) is a double star in the constellation Cassiopeia.
6 Cassiopeiae A is a white A2.5 type hypergiant. It is about 25 times as massive as the Sun and 200,000 times as luminous. The star is slightly and erratically variable, an Alpha Cygni variable.
6 Cas A has a number of close companions, most notably an 8th magnitude O class bright giant at only 1.5". Its spectral type is O9.75 and its absolute magnitude is −5.8. Both are considered to be members of the Cassiopeia OB5 stellar association at a distance of around 8,000 light-years.
6 Cas A is an α Cyg variable, pulsating erratically between 5.34 and 5.45. The strongest period detected in one study was 37 days. It has the variable star designation V566 Cassiopeiae.
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