Alphard
Star in the constellation Hydra / From Wikipedia, the free encyclopedia
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This article is about the star. For the programming language, see Alphard (programming language). For the vehicle, see Toyota Alphard.
Not to be confused with Alpharad or Alpharadin.
Alphard /ˈælfɑːrd/,[9] designated Alpha Hydrae (α Hydrae, abbreviated Alpha Hya, α Hya), is the brightest star in the constellation of Hydra. It is a single giant star, cooler than the Sun but larger and more luminous. It is about 177 light-years away.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 27m 35.2433s[1] |
Declination | −08° 39′ 30.969″[1] |
Apparent magnitude (V) | +2.00[2] |
Characteristics | |
Spectral type | K3 II-III[2] |
U−B color index | +1.73[3] |
B−V color index | +1.44[3] |
Astrometry | |
Radial velocity (Rv) | −4.3[4] km/s |
Proper motion (μ) | RA: −14.49[1] mas/yr Dec.: 33.25[1] mas/yr |
Parallax (π) | 18.40 ± 0.78 mas[1] |
Distance | 177 ± 8 ly (54 ± 2 pc) |
Absolute magnitude (MV) | −1.69 ± 0.09[5] |
Details | |
Mass | 3.03 ± 0.36[5] M☉ |
Radius | 50.5 ± 4.0[5] R☉ |
Luminosity | 780 ± 78[2] L☉ |
Surface gravity (log g) | 1.54[6] cgs |
Temperature | 4,120[6] K |
Metallicity [Fe/H] | −0.06[6] dex |
Rotation | 2,991 days[7] |
Rotational velocity (v sin i) | 1.1[7] km/s |
Age | (4.2 ± 1.6) × 108[5] years |
Other designations | |
Database references | |
SIMBAD | data |
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