Alpha Crateris
Alpha Crateris (α Crateris, abbreviated Alpha Crt, α Crt), officially named Alkes /ˈælkɛs/, is a star in the constellation of Crater. It is a cool giant star about 43.2 parsecs (141 ly) away.
| 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) | 23.1349 ± 0.3685 mas |
| Distance | 141 ± 2 ly (43.2 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.44 |
| 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 |
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