Alpha Columbae information

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/),^[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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^ 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.
^ "IAU Catalog of Star Names". Retrieved 28 July 2016.

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[mnassa31_69-2] Cite error: The named reference mnassa31_69 was invoked but never defined (see the help page).

[levenhagen_Leister_2006-3] Cite error: The named reference levenhagen_Leister_2006 was invoked but never defined (see the help page).

[houk1979-4] Cite error: The named reference houk1979 was invoked but never defined (see the help page).

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[Anderson2012-7] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[kaler-8] Cite error: The named reference kaler was invoked but never defined (see the help page).

[aaa505_2_687-9] Cite error: The named reference aaa505_2_687 was invoked but never defined (see the help page).

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[Kunitzsch-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.

[IAU-CSN-13] "IAU Catalog of Star Names". Retrieved 28 July 2016.

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of α Columbae (circled)
Constellation	Columba
Right ascension	05^h 39^m 38.94103^s^[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 (R_v)	+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]
Distance	261 ± 8 ly (80 ± 2 pc)
Absolute magnitude (M_V)	−1.87^[7]

Details

Mass	4.5^[8] `M`_☉
Radius	5.8^[9] `R`_☉
Luminosity (bolometric)	1,000^[8] `L`_☉
Surface gravity (log g)	3.73^[9] cgs
Temperature	12,963^[9] K
Rotational velocity (v sin i)	176^[10] km/s
Age	93^[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
SIMBAD	data

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