Alpha Columbae

Alpha Columbae
	Location of α Columbae (circled)
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	5.8 R☉
Luminosity (bolometric)	1,000 L☉
Surface gravity (log g)	3.73 cgs
Temperature	12,963 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).

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