Lambda Cassiopeiae

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λ Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 00h31m46.4s
Declination +54°31′20″
Apparent magnitude (V)+5.5/+5.8
Characteristics
Spectral typeB7.5V/B8.5V
U−B color index−0.35
B−V color index−0.10
Variable typenone
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
Distance355 ly
(109 pc)
Absolute magnitude (MV)+0.3/+0.6
Other designations
14 Cassiopeiae, HR 123, HD 2772, BD+53°82, HIP 2505, SAO 21489, GC 618, ADS 434, CCDM J00318+5431
Map of the Bayer-designated stars in Cassiopeia. Lambda Cassiopeiae is circled.

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.


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