  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 15h 27m 49.7308s[1][2] |
| Declination | +29° 06′ 20.530″[1][2] |
| Apparent magnitude (V) | 3.65 to 3.72[3] |
| Characteristics | |
| Spectral type | A9SrEuCr[4] / F2[5] |
| U−B color index | +0.11[6] |
| B−V color index | +0.28[6] |
| V−R color index | 0.2[1] |
| R−I color index | +0.05[6] |
| Variable type | ACV[3] roAp[5] |
| Astrometry | |
| Radial velocity (Rv) | −18.7±0.9[1] km/s |
| Proper motion (μ) | RA: −181.39[1][2] mas/yr Dec.: 86.84[1][2] mas/yr |
| Parallax (π) | 29.17 ± 0.76 mas[7] |
| Distance | 112 ± 3 ly (34.3 ± 0.9 pc) |
| Orbit[8] | |
| Period (P) | 10.27±0.14 y |
| Semi-major axis (a) | 0.205±0.002″ |
| Eccentricity (e) | 0.524±0.006 |
| Inclination (i) | 111.1±0.9° |
| Longitude of the node (Ω) | 148.2±0.5° |
| Periastron epoch (T) | B1980.506±0.014 |
| Argument of periastron (ω) (secondary) | 181.3±0.7° |
| Details[5] | |
| A | |
| Mass | 2.09±0.15 M☉ |
| Radius | 2.63±0.09 R☉ |
| Luminosity | 25.3±2.9 L☉ |
| Temperature | 7,980±180 K |
| B | |
| Mass | 1.40±0.10 M☉ |
| Radius | 1.56±0.07 R☉ |
| Luminosity | 4.5±0.5 L☉ |
| Surface gravity (log g) | 4 cgs |
| Temperature | 6,750±230 K |
| Metallicity [Fe/H] | 0.28 dex |
| Age | 530±100 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Coronae Borealis (β Coronae Borealis, abbreviated Beta CrB, β CrB) is a binary star in the constellation of Corona Borealis. It appears to the naked eye to be a single star and is the second-brightest star in its constellation with an apparent visual magnitude varying between 3.65 and 3.72. Based on parallax measurements taken during the Hipparcos mission, it is approximately 112 light-years from the Sun.
The two components are designated Beta Coronae Borealis A (officially named Nusakan /ˈnjuːsəkæn/, the traditional name of the system)[9][10] and B.
- ^ a b c d e f "* bet CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 8, 2008.
- ^ a b c d Astrometric data, mirrored by SIMBAD from the Hipparcos catalogue, pertains to the center of mass of the β Coronae Borealis binary system. See §2.3.4, Volume 1, The Hipparcos and Tycho Catalogues, European Space Agency, 1997, and the entry in the Hipparcos catalogue (CDS ID I/239.)
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ North, P.; Carquillat, J.-M.; Ginestet, N.; Carrier, F.; Udry, S. (1998). "Multiplicity among peculiar a stars". Astronomy and Astrophysics Supplement Series. 130 (2): 223. arXiv:astro-ph/9712025. Bibcode:1998A&AS..130..223N. doi:10.1051/aas:1998365. S2CID 14002166..
- ^ a b c Cite error: The named reference
brunttwas invoked but never defined (see the help page). - ^ a b c HR 5747, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 8, 2008.
- ^ van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ Entry 15278+2906, Sixth Catalog of Orbits of Visual Binary Stars Archived 2005-04-24 at the Wayback Machine, United States Naval Observatory. Accessed on line September 9, 2008.
- ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
- ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.