Lambda 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 | |
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
- 1 2 3 4 5 6 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
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This article is issued from Wikipedia - version of the Sunday, June 08, 2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.