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.
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Stars of Cassiopeia
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| Bayer |
- α (Schedar)
- β (Caph)
- γ (Tsih)
- δ (Ruchbah)
- ε (Segin)
- ζ
- η (Achird)
- θ
- ι
- κ
- λ
- μ
- ν
- ξ
- ο
- π
- ρ
- σ
- τ
- υ1
- υ2
- φ
- χ
- ψ
- ω
- A
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| 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
- 55
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