Lambda Cassiopeiae
From Infogalactic: the planetary knowledge core
Observation data Epoch J2000.0 Equinox J2000.0 |
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Constellation | Cassiopeia |
Right ascension | 00h 31m 46.359s[1] |
Declination | +54° 31′ 20.23″[1] |
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: 41.20 ± 0.29[1] mas/yr Dec.: −16.54 ± 0.35[1] mas/yr |
Parallax (π) | 8.64 ± 0.43[1] mas |
Distance | 380 ± 20 ly (116 ± 6 pc) |
Absolute magnitude (MV) | +0.3/+0.6 |
Other designations | |
![](/w/images/thumb/3/38/Lambda_cassiopeiae_diagram.jpg/300px-Lambda_cassiopeiae_diagram.jpg)
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 380 light years from Earth.[1]
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.
References
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