Arcturus
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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: 093.45 −1[2] mas/yr Dec.: 999.40 −1[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) | ±0.02 −0.30[4] |
Details | |
Mass | ±0.06 1.08[5] M☉ |
Radius | ±0.2 25.4[5] R☉ |
Luminosity | 170[6] L☉ |
Surface gravity (log g) | ±0.05 1.66[5] cgs |
Temperatur | ±30 4286[5] K |
Metallicity [Fe/H] | ±0.04 −0.52[5] dex |
Rotational velocity (v sin i) | ±1.0 2.4[4] km/s |
Age | +1.5 −1.2 7.1[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}}