- Omicron Cassiopeiae
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ο Cassiopeiae Observation data
Epoch J2000.0 Equinox J2000.0Constellation 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 
Map of the Bayer-designated stars in Cassiopeia. Omicron Cassiopeiae is circled.
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 companion 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.
Bayer Flamsteed 1 • 2 • 4 • 5 (τ) • 6 • 7 (ρ) • 8 (σ) • 9 • 10 • 11 (β, Caph) • 12 • 13 • 14 (λ) • 15 (κ) • 16 • 17 (ζ) • 18 (α, Schedar) • 19 (ξ) • 20 (π) • 21 • 22 (ο) • 23 • 24 (η, Achird) • 25 (ν) • 26 (υ1) • 27 (γ, Tsih) • 28 (υ2) • 30 (μ) • 31 • 32 • 33 (θ) • 34 (φ) • 35 • 36 (ψ) • 37 (δ, Ruchbah) • 38 • 39 (χ) • 40 • 42 • 43 • 44 • 45 (ε, Segin) • 46 (ω) • 47 • 48 (A) • 49 • 50 • 51 • 52 • 53 • 54 • 55Categories:- Bayer objects
- B-type giants
- F-type main sequence stars
- Cassiopeia constellation
- Gamma Cassiopeiae variables
- Triple star systems
- Spectroscopic binaries
- Variable star stubs
- Multiple star stubs
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