Arcturus
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 Arcturus in the constellation o Boötes. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Pronunciation | /ɑːrkˈtjʊərəs/ |
| Richt ascension | 14h 15m 39.7s[1] |
| Declination | +19° 10′ 56″[1] |
| Apparent magnitude (V) | −0.05[1] |
| Chairactereestics | |
| Spectral type | K0III |
| Apparent magnitude (J) | −2.25[1] |
| U−B colour index | 1.27 |
| B−V colour index | 1.23 |
| R−I colour index | 0.65 |
| Note (category: variability): | H an K emission vary. |
| Astrometry | |
| Radial velocity (Rv) | −5 km/s |
| Proper motion (μ) | RA: −1093.45[2] mas/yr Dec.: −1999.40[2] mas/yr |
| Parallax (π) | 88.83 ± 0.54[3] mas |
| Distance | 36.7 ± 0.2 ly (11.26 ± 0.07 pc) |
| Absolute magnitude (MV) | −0.30±0.02[4] |
| Details | |
| Mass | 1.08±0.06[5] M☉ |
| Radius | 25.4±0.2[5] R☉ |
| Luminosity | 170[6] L☉ |
| Surface gravity (log g) | 1.66±0.05[5] cgs |
| Temperatur | 4286±30[5] K |
| Metallicity [Fe/H] | −0.52±0.04[5] dex |
| Rotational velocity (v sin i) | 2.4±1.0[4] km/s |
| Age | 7.1+1.5 −1.2[5] Gyr |
| Ither designations | |
| Database references | |
| SIMBAD | data |
| Data soorces: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5t rev. ed.), VizieR catalog entry | |
Arcturus (/ɑːrkˈtjʊərəs/; α Boo, α Boötis, Alpha Boötis) o the constellation Boötes is the brichtest starn in the northren celestial hemisphere.
References[eedit | eedit soorce]
- ↑ 1.0 1.1 1.2 1.3 "Arcturus (HD 124897)". SIMBAD Astronomical Database. Retrieved 2011-11-27.
- ↑ 2.0 2.1 Perryman; et al. (1997). "HIP 69673". The Hipparcos and Tycho Catalogues.
- ↑ van Leeuwen, F. (November 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.
- ↑ 4.0 4.1 Carney, Bruce W.; et al. (March 2008). "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars". The Astronomical Journal. 135 (3): 892–906. arXiv:0711.4984. Bibcode:2008AJ....135..892C. doi:10.1088/0004-6256/135/3/892{{inconsistent citations}}
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 I. Ramírez; C. Allende Prieto (December 2011). "Fundamental Parameters and Chemical Composition of Arcturus". The Astrophysical Journal. 743 (2): 135. arXiv:1109.4425. Bibcode:2011ApJ...743..135R. doi:10.1088/0004-637X/743/2/135.
- ↑ Schröder, K.-P.; Cuntz, M. (April 2007). "A critical test of empirical mass loss formulas applied to individual giants and supergiants". Astronomy and Astrophysics. 465 (2): 593–601. arXiv:astro-ph/0702172. Bibcode:2007A&A...465..593S. doi:10.1051/0004-6361:20066633{{inconsistent citations}}