Constellation Canis Major
Right ascension 06h 45m 08.9173s
Declination −16° 42' 58.017"
Apparent magnitude (V) −1.47 (A) / 8.44 (B)
Characteristics
Spectral type A1V (A) / DA2 (B)
U-B color index −0.08 (A) / −1.04 (B)
B-V color index 0.01 (A) / −0.03 (B)
Astrometry
Radial velocity (Rv) −7.6 km/s
Proper motion (μ) RA: −546.01 mas/yr
Dec.: −1223.08 mas/yr
Parallax (π) 379.21 ± 1.58 mas
Distance 8.6 ± 0.04 ly
(2.64 ± 0.01 pc)
Absolute magnitude (MV) 1.47 (A) / 11.35 (B)
Visual binary orbit[1], p. 195
Companion α CMa B
Period (P) 50.09 a
Semimajor axis (a) 7.56"
Eccentricity (e) 0.592
Inclination (i) 136.5°
Longitude of the node (Ω) 44.6°
Periastron epoch (T) 1894.13
Argument of periastron (ω) 147.3°
Details
Mass 2.02[2] (A) /
0.978[2] (B) M☉
Radius 1.711[2] (A) /
0.0084 ± 3%[3] (B) R☉
Luminosity 25.4[2] (A) /
0.0024 (B) L☉
Temperature 9,900 (A) /
25,200[2] (B) K
Metallicity 190% Sun (A)
Age 2-3 × 108[2] years
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