Lambda Cassiopeiae

λ Cassiopeiae
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cassiopeia
Right ascension	00h 31m 46.359s
Declination	+54° 31′ 20.23″
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 mas/yr ; Dec.: −16.54 ± 0.35 mas/yr
Parallax (π)	8.64 ± 0.43 mas
Distance	380 ± 20 ly ; (116 ± 6 pc)
Absolute magnitude (MV)	+0.3/+0.6
Other designations
	14 Cassiopeiae, HR 123, HD 2772, BD+53°82, HIP 2505, SAO 21489, ADS 434, CCDM J00318+5431

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

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry

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[van_Leeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry

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