| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h59m00.5s |
| Declination | +55°45′18″ |
| Apparent magnitude (V) | +4.88 |
| Characteristics | |
| Spectral type | B1V |
| U−B color index | −0.82 |
| B−V color index | −0.07 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | −13 km/s |
| Proper motion (μ) | RA: 9.26 mas/yr Dec.: −5.09 mas/yr |
| Parallax (π) | 2.14 ± 0.75 mas |
| Distance | 1520 ly (470 pc) |
| Absolute magnitude (MV) | −3.46 |
| Other designations | |
Sigma Cassiopeiae (σ Cas, σ Cassiopeiae) is a binary star in the constellation Cassiopeia. It is approximately 1520 light years from Earth and is a combined apparent magnitude of +4.88.
The primary component, σ Cassiopeiae A, is a blue-white B-type giant with an apparent magnitude of +5.0. Its companion, σ Cassiopeiae B, is a blue-white B-type main sequence dwarf, with an apparent magnitude of +7.1. The two stars are 3.1 arcseconds apart.
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