Lambda Cassiopeiae
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Observation data Equinox J2000.0 |
|
---|---|
Constellation | Cassiopeia |
Right ascension | 00h31m46.4s |
Declination | +54°31′20″ |
Apparent magnitude (V) | +5.5/+5.8 |
Characteristics | |
Spectral type | B7.5V/B8.5V |
U-B color index | −0.35 |
B-V color index | −0.10 |
Variable type | none |
Astrometry | |
Radial velocity (Rv) | −12 km/s |
Proper motion (μ) | RA: 40.78 mas/yr Dec.: −14.81 mas/yr |
Parallax (π) | 9.20 ± 1.06 mas |
Distance | 355 ly (109 pc) |
Absolute magnitude (MV) | +0.3/+0.6 |
Other designations | |
Lambda Cassiopeiae (λ Cas / λ Cassiopeiae) is a binary star in the constellation Cassiopeia. The system has a combined apparent magnitude of +4.74 and is approximately 355 light years from Earth.
Both components are blue-white B-type main sequence dwarfs. The brighter, λ Cassiopeiae A, has an apparent magnitude of +5.5, while its companion, λ Cassiopeiae 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 once every 640 years.