Capella Aa/Ab

Capella is the brightest star in Auriga
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Component Aa Ab
Right ascension 05
Declination +45° 59′ 52.768″
Apparent magnitude (V) 0.91 0.76
  0.08   
(0.03 to 0.16)
Characteristics
Spectral type G8III/K0III G1III
U-B color index +0.44
B-V color index +0.80
V-R color index −0.3
R-I color index +0.44
Variable type RS CVn
Astrometry
Radial velocity (Rv) 29.19 ± 0.074km/s
Proper motion:  
RA α cos δ) 75.52 mas/yr
Dec. δ) −427.11 mas/yr
Parallax (π) 77.29 ± 0.89mas
Distance 42.2 ± 0.5 ly
(12.9 ± 0.1 pc)
Absolute magnitude (MV) 0.35 0.20
  −0.48
Details
Mass 2.69 ± 0.06 M 2.56 ± 0.04 M
Radius 12.2 ± 0.2 R 9.2 ± 0.4 R
Luminosity (bolometric) 78.5 ± 1.2 L 77.6 ± 2.6 L
Temperature 4940 ± 50 K 5700 ± 100 K
Metallicity 40% Sun
Rotation 106 ± 3 d 8.64 ± 0.09 d
Rotational velocity (v sin i) 3km/s 36km/s
Age 5.2 × 10years
Orbit
Period (P) 104.022 ± 0.002 d
Semimajor axis (a) 56.47 ± 0.05 mas
Eccentricity (e) 0.0000 ± 0.0002
Inclination (i) 137.18 ± 0.05°
Longitude of node (Ω) 40.8 ± 0.1°
Periastron epoch (T) 2447528.45 ± 0.02 JD
Database references
SIMBAD data
  data data
Other designations
Alhajoth, Capella, Hokulei, α Aurigae, α Aur, Alpha Aurigae, Alpha Aur, 13 Aurigae, 13 Aur, ADS 3841 AP, BD+45°1077, CCDM J05168+4559AP, FK5 193, GC 6427, GJ 194, HD 34029, HIP 24608, HR 1708, IDS 05093+4554 AP, LTT 11619, NLTT 14766, PPM 47925, SAO 40186, WDS 05167+4600Aa/Ab.

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Capella, which is released under the Creative Commons Attribution-Share-Alike License 3.0