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Lambda Cassiopeiae

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Lambda Cassiopeiae
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Lambda Cassiopeiae, Latinized from λ Cassiopeiae, is a binary star system, in the northern constellation of Cassiopeia. The system has a combined apparent magnitude of +4.74, making it faintly visible to the naked eye. With an annual parallax shift of 8.64 mass,[2] it is approximately 380 light years from Earth. The system is moving closer to the Sun with a radial velocity of −12 km/s.[6]

Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
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λ Cassiopeiae in optical light

Both components are blue-white B-type main-sequence stars. The brighter member, component A, has an apparent magnitude of +5.5, while its companion, component B, has an apparent magnitude of +5.8. The two stars are separated by 0.6 arcseconds and complete one orbit around their common centre of mass about once every 250 years.[4] The primary displays an infrared excess, possibly due to a debris disk or other orbiting material.[8]

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