Kappa Cephei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 20h 08m 53.348s[1] |
| Declination | +77° 42′ 41.12″[1] |
| Apparent magnitude (V) | 4.395[2] |
| Characteristics | |
| Spectral type | B9III[2] + A7V |
| U−B color index | -0.12 |
| B−V color index | -0.04 |
| Astrometry | |
| Radial velocity (Rv) | −22.8 ± 0.9[2] km/s |
| Proper motion (μ) | RA: 11.57 ± 0.29[1] mas/yr Dec.: 24.34 ± 0.33[1] mas/yr |
| Parallax (π) | 10.36 ± 0.29[1] mas |
| Distance | 315 ± 9 ly (97 ± 3 pc) |
| Absolute magnitude (MV) | -0.53 |
| Details | |
| Radius | 4.45 ± 0.22[3] R☉ |
| Surface gravity (log g) | 3.66 ± 0.03[3] cgs |
| Temperature | 10,174 ± 55[3] K |
| Other designations | |
Kappa Cephei (κ Cep) is a binary star[4] in the constellation Cepheus. Its apparent magnitude is 4.395.[2] Located approximately 96.53 parsecs (314.8 ly) distant,[1] the primary is a blue giant of spectral type B9III,[2] a star that has used up its core hydrogen and is likely expanding to become a supergiant. The secondary is a main sequence star of spectral type A7V. It has an apparent magnitude of 8.34 and lies 7.38 arc seconds distant.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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
- ↑ 2.0 2.1 2.2 2.3 2.4 "Kappa Cephei". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 12 October 2014.
- ↑ 3.0 3.1 3.2 Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855
- ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x.
- ↑
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