Lambda Cassiopeiae

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λ Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
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
14 Cassiopeiae, HR 123, HD 2772, BD+53°82, HIP 2505, SAO 21489, 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 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[edit]

  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