Omicron Cassiopeiae
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| Observation data Equinox J2000.0 |
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|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h44m43.5s |
| Declination | +48°17′04″ |
| Apparent magnitude (V) | +4.48 |
| Distance | 910 ± 210 ly (278 ± 63 pc) |
| Spectral type | B5IIIe |
| Other designations | |
Omicron Cassiopeiae (ο Cas / ο Cassiopeiae) is a triple star system in the constellation Cassiopeia. It is approximately 910 light years from Earth.
The primary component, ο Cassiopeiae A, is a blue-white B-type giant with a mean apparent magnitude of +4.54. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +4.50 to +4.62. The primary is a spectroscopic binary, and its close comanion completes one orbit every 2.83 years. A more distant companion, ο Cassiopeiae B, lies 33.6 arcseconds away. It is an eleventh magnitude, yellow-white F-type main sequence dwarf.
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