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[1]
Declination −34° 04′ 26.7950″[1]
Apparent magnitude (V) 2.645[2]
Characteristics
Spectral type B9Ve[3] or B7 IV[4]
U−B color index −0.44[2]
B−V color index −0.125[2]
R−I color index −0.09[5]
Astrometry
Radial velocity (Rv)+35.0[6] km/s
Proper motion (μ) RA: −1.58[1] mas/yr
Dec.: −24.82[1] mas/yr
Parallax (π)12.48 ± 0.36 mas[1]
Distance261 ± 8 ly
(80 ± 2 pc)
Absolute magnitude (MV)−1.87[7]
Details
Mass4.5[8] M☉
Radius7±0.14[9] R☉
Luminosity (bolometric)1,000[8] L☉
Surface gravity (log g)3.5±0.04[9] cgs
Temperature12,200±122[9] K
Rotational velocity (v sin i)176[10] km/s
Age93[3] 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[11]
Database references
SIMBADdata

Alpha Columbae or α Columbae, officially named Phact (/ˈfækt/),[12][13] is a third magnitude star in the southern constellation of Columba. It has an apparent visual magnitude of 2.6,[2] 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).[1]

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  12. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  13. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.