Alpha Hydrae

Alphard is the α star in the constellation of Hydra.
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 09
Declination –08° 39′ 30.969″
Apparent magnitude (V) +2.00
Characteristics
Spectral type K3 II-III
U−B color index +1.73
B−V color index +1.44
Astrometry
Radial velocity (Rv) -4.3 km/s
Proper motion (μ) RA: –14.49 mas/yr
Parallax (π) 18.40 ± 0.78mas
Distance 177 ± 8 ly
(54 ± 2 pc)
Absolute magnitude (MV) −1.69 ± 0.09
Details
Mass 3.03 ± 0.36M
Radius 50.5 ± 4.0R
Luminosity 780 ± 78L
Surface gravity (log g) 1.54
Temperature 4,120K
Metallicity [Fe/H] -0.06dex
Rotation 2,991 days
Rotational velocity (v sin i) 1.1 km/s
Age (4.2 ± 1.6) × 10 years
Other designations
Alphard, Alfard, Alphart, Kalbelaphard, Cor Hydrae, 30 Hydrae, HR 3748, BD -08°2680, HD 81797, SAO 136871, FK5 354, HIP 46390.

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