Alpha Phoenicis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 00h 26m 17.06309s |
| Declination | −42° 18′ 21.7712″ |
| Apparent magnitude (V) | 2.377 |
| Characteristics | |
| Spectral type | K0.5 IIIb |
| U−B color index | +0.903 |
| B−V color index | +1.092 |
| Astrometry | |
| Radial velocity (Rv) | +74.6 km/s |
| Proper motion (μ) | RA: +176.268 mas/yr Dec.: −398.872 mas/yr |
| Parallax (π) | 39.9183±0.7283 mas |
| Distance | 82 ± 1 ly (25.1 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.52 |
| Orbit | |
| Period (P) | 3848.8 days |
| Semi-major axis (a) | 103.5 mas |
| Eccentricity (e) | 0.34 |
| Inclination (i) | 128.0±5.4° |
| Longitude of the node (Ω) | 242.8±3.9° |
| Periastron epoch (T) | 2416201.8 HJD |
| Argument of periastron (ω) (primary) | 19.8° |
| Details | |
| Mass | 2.79±0.14 M☉ |
| Radius | 14.7 R☉ |
| Luminosity | 83 L☉ |
| Surface gravity (log g) | 2.53 cgs |
| Temperature | 4,700 K |
| Metallicity [Fe/H] | −0.73 dex |
| Rotational velocity (v sin i) | 1.0 km/s |
| Other designations | |
| Ankaa, Nair al Zaurak, Cymbae, Lucida Cymbae, CD−42°116, FK5 12, GCTP 71.00, HIP 2081, HR 99, HD 2261, LTT 231, SAO 215093. | |
| Database references | |
| SIMBAD | data |
Alpha Phoenicis (α Phoenicis, abbreviated Alpha Phe or α Phe), formally named Ankaa /ˈæŋkə/, (with the same pronunciation) is the brightest star in the constellation of Phoenix.