Nu2 Columbae

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]
Distance133 ± 2 ly
(40.8 ± 0.5 pc)
Absolute magnitude (MV)+2.21[5]
Details
Mass1.65[4] M☉
Radius1.6[6] R☉
Luminosity10[7] L☉
Surface gravity (log g)3.91[8] cgs
Temperature6,473±80[4] K
Metallicity [Fe/H]−0.11±0.15[9] dex
Rotational velocity (v sin i)27.2[8] km/s
Age1.8[4] Gyr
Other designations
ν2 Col, CD−28° 2321, HD 37495, HIP 26460, HR 1935, SAO 170613.[10]
Database references
SIMBADdata

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.

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Pizzolato2000 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Schroeder2009 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Balachandran1990 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).