Alpha Columbae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 39m 38.94103s |
| Declination | −34° 04′ 26.7950″ |
| Apparent magnitude (V) | 2.645 |
| Characteristics | |
| Spectral type | B9Ve or B7 IV |
| U−B color index | −0.44 |
| B−V color index | −0.125 |
| R−I color index | −0.09 |
| Astrometry | |
| Radial velocity (Rv) | +35.0 km/s |
| Proper motion (μ) | RA: −1.58 mas/yr Dec.: −24.82 mas/yr |
| Parallax (π) | 12.48±0.36 mas |
| Distance | 261 ± 8 ly (80 ± 2 pc) |
| Absolute magnitude (MV) | −1.87 |
| Details | |
| Mass | 4.5 M☉ |
| Radius | 7±0.14 R☉ |
| Luminosity (bolometric) | 1,000 L☉ |
| Surface gravity (log g) | 3.5±0.04 cgs |
| Temperature | 12,200±122 K |
| Rotational velocity (v sin i) | 176 km/s |
| Age | 93 Myr |
| Other designations | |
| Alpha Col, α Col, NSV 2549, CD−34 2375, CPD−34 703, FK5 215, GC 7078, HD 37795, HIP 26634, HR 1956, SAO 196059, PPM 281732, CCDM J05396−3404 A | |
| Database references | |
| SIMBAD | data |
Alpha Columbae or α Columbae, officially named Phact (/ˈfækt/), is a third magnitude star in the southern constellation of Columba. It has an apparent visual magnitude of 2.6, making it the brightest member of Columba. Based upon parallax measurements made during the Hipparcos mission, Alpha Columbae is located at a distance of around 261 light-years (80 parsecs).