![]() Arcturus in the constellation of Boötes. |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Boötes |
Pronunciation | ![]() |
Right ascension | 14 |
Declination | +19° 10′ 56″ |
Apparent magnitude (V) | −0.04 |
Characteristics | |
Spectral type | K1.5IIIFe-0.5 |
Apparent magnitude (J) | -2.25 |
U−B color index | 1.27 |
B−V color index | 1.23 |
R−I color index | 0.65 |
Variable type | Variable star |
Note (category: variability): | H and K emission vary. |
Astrometry | |
Radial velocity (Rv) | +5 km/s |
Proper motion (μ) | RA: −1093.45 mas/yr Dec.: −1999.40 mas/yr |
Parallax (π) | 88.98 ± 0.68 mas |
Distance | 36.7 ± 0.3 ly (11.24 ± 0.09 pc) |
Absolute magnitude (MV) | −0.30 ± 0.02 |
Details | |
Mass | 1.10 ± 0.06M☉ |
Radius | 25.7 ± 0.3R☉ |
Luminosity | 170L☉ |
Surface gravity (log g) | 1.76 ± 0.05 |
Temperature | 4,290 ± 43K |
Metallicity [Fe/H] | −0.37dex |
Rotational velocity (v sin i) | 2.4 ± 1.0 km/s |
Other designations | |
Alramech, Abramech, α Boötis, 16 Boötes, BD+19°2777, GCTP 3242.00, GJ 541, HD 124897, HIP 69673, HR 5340, LHS 48.
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Database references | |
SIMBAD | data |
Data sources: | |
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.), VizieR catalog entry |