Nu2 Columbae

Nu² Columbae is a solitary star^[11] in the southern constellation of Columba. It can be seen with the naked eye, having an apparent visual magnitude of 5.31.^[2] With an annual parallax shift of 24.51 mas,^[1] it is estimated to lie about 133 light years from the Sun.

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

ν² Columbae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	05h 37m 44.61799s[1]
Declination	−28° 41′ 22.8863″[1]
Apparent magnitude (V)	5.31[2]
Characteristics
Spectral type	F5 V[3]
U−B color index	+0.10[2]
B−V color index	+0.46[2]
Astrometry
Radial velocity (Rv)	+38.0±2.6[4] km/s
Proper motion (μ)	RA: −37.66[1] mas/yr Dec.: +42.42[1] mas/yr
Parallax (π)	24.51±0.29 mas[1]
Distance	133 ± 2 ly (40.8 ± 0.5 pc)
Absolute magnitude (MV)	+2.21[5]
Details
Mass	1.65[4] M☉
Radius	1.6[6] R☉
Luminosity	10[7] L☉
Surface gravity (log g)	3.91[8] cgs
Temperature	6,473±80[4] K
Metallicity [Fe/H]	−0.11±0.15[9] dex
Rotational velocity (v sin i)	27.2[8] km/s
Age	1.8[4] Gyr
Other designations
ν2 Col, CD−28°2321, HD 37495, HIP 26460, HR 1935, SAO 170613.[10]
Database references
SIMBAD	data

This star has a stellar classification of F5 V,^[3] indicating that it is an F-type main sequence star that is generating energy through the thermonuclear fusion of hydrogen into helium in its core region. It has about 1.65 times the mass of the Sun^[4] and 1.6 times the Sun's radius.^[6] X-ray emission has been detected from this star, with an estimated luminosity of 1.6×10²⁹ erg/s.^[5] It is about 1.8 billion years old^[4] and is spinning with a projected rotational velocity of 27.2 km/s.^[8] The star is radiating about 10 times the solar luminosity from its outer atmosphere^[7] at an effective temperature of 6,473 K.^[4]