Lambda Cassiopeiae
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
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.
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