Α Crt
 Location of α Crateris (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Crater |
| Right ascension | 10h 59m 46.46486s |
| Declination | −18° 17′ 55.6172″ |
| Apparent magnitude (V) | 4.07 |
| Characteristics | |
| Spectral type | K1 III |
| Astrometry | |
| Radial velocity (Rv) | 47.54 ± 0.16 km/s |
| Proper motion (μ) |
RA: −462.26 ± 0.24 mas/yr Dec.: 129.49 ± 0.26 mas/yr |
| Parallax (π) | 20.49 ± 0.27mas |
| Distance | 159 ± 2 ly (48.8 ± 0.6 pc) |
| Details | |
| Mass | 1.81 M☉ |
| Radius | 12.32 R☉ |
| Luminosity | 66.0 L☉ |
| Surface gravity (log g) | 2.53 cgs |
| Temperature | 4.691 K |
| Metallicity [Fe/H] | +0.01 dex |
| Age | 2.06 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alpha Crateris (α Crateris, abbreviated Alpha Crt, α Crt), also named Alkes, is a star in the constellation of Crater.
α Crateris (Latinised to Alpha Crateris) is the star's Bayer designation.
It bore the traditional name Alkes, from the Arabic الكاس alkās or الكأس alka's "the cup". In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Aoul al Batjna (أول ألبجن awwil albajna), which was translated into Latin as Prima Crateris, meaning "the first cup". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Alkes for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names.
In Chinese, 翼宿 (Yì Sù), meaning Wings (asterism), refers to an asterism consisting of Alpha Crateris, Gamma Crateris, Zeta Crateris, Lambda Crateris, Nu Hydrae, Eta Crateris, Delta Crateris, Iota Crateris, Kappa Crateris, Epsilon Crateris, HD 95808, HD 93833, Theta Crateris, HD 102574, HD 100219, Beta Crateris, HD 99922, HD 100307, HD 96819, Chi1 Hydrae, HD 102620 and HD 103462. Consequently, Alpha Crateris itself is known as 翼宿一 (Yì Sù yī, English: the First Star of Wings.).
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