Pi1 Columbae

Pi¹ Columbae, Latinized from π¹ Columbae, is a star in the southern constellation of Columba. With an apparent visual magnitude of 6.13,^[2] it is a dim, white-hued star that is near the limit of visibility for the naked eye. It is located approximately 280 light years from the Sun based on parallax,^[1] and has an absolute magnitude of +1.55.^[5]

For other stars with this Bayer designation, see π Columbae.

Pi¹ Columbae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	06h 06m 41.03304s[1]
Declination	−42° 17′ 55.5846″[1]
Apparent magnitude (V)	6.13[2]
Characteristics
Spectral type	A2mA5-A9[3]
U−B color index	+0.11[2]
B−V color index	+0.25[2]
Astrometry
Radial velocity (Rv)	2.0±4.3[4] km/s
Proper motion (μ)	RA: −26.957[1] mas/yr Dec.: −5.880[1] mas/yr
Parallax (π)	11.6365±0.1653 mas[1]
Distance	280 ± 4 ly (86 ± 1 pc)
Absolute magnitude (MV)	+1.55[5]
Details
Radius	2.49+0.15 −0.11[1] R☉
Luminosity	20.237+0.23 −0.33[1] L☉
Temperature	7,765+171 −228[1] K
Rotational velocity (v sin i)	70[6] km/s
Other designations
π1 Col, CPD−42°2343, GC 7785, HD 42078, HIP 28957, HR 2171, SAO 217720[7]
Database references
SIMBAD	data

This is an Am star with a stellar classification of A2mA5-A9.^[3] It has 2.5 times the Sun's radius and shines with 20 times the luminosity of the Sun at an effective temperature of 7,765 K.^[1] The star is spinning with a projected rotational velocity of 70 km/s.^[6]