Pi2 Columbae

For other stars with this Bayer designation, see π Columbae.
Pi2 Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 06h 07m 52.86009s[1]
Declination −42° 09′ 14.5488″[1]
Apparent magnitude (V) 5.50[2]
Characteristics
Spectral type A0 V + A[3]
B−V color index +0.00[2]
Astrometry
Radial velocity (Rv)+31.0±3.7[4] km/s
Proper motion (μ) RA: −10.612[1] mas/yr
Dec.: −16.928[1] mas/yr
Parallax (π)12.8296 ± 0.1132 mas[1]
Distance254 ± 2 ly
(77.9 ± 0.7 pc)
Absolute magnitude (MV)+1.17[5]
Details[6]
Mass2.64 M☉
Luminosity31[7] L☉
Surface gravity (log g)4.38±0.14 cgs
Temperature11,223±382 K
Rotational velocity (v sin i)274 km/s
Age98 Myr
Other designations
π2 Col, CD−42° 2351, HD 42303, HIP 29064, HR 2181, SAO 217730[8]
Database references
SIMBADdata

π2 Columbae, Latinized as Pi2 Columbae, is a binary star[9] system in the southern constellation of Columba, near the southern constellation border with Pictor. It is white-hued and dimly visible to the naked eye with a combined apparent visual magnitude of 5.50.[2] Based upon an annual parallax shift of 12.8 mas as seen from Earth,[1] this system is located about 254 light years from the Sun. They are receding with a heliocentric radial velocity of +31 km/s.[4]

The pair have an angular separation of 0.1[3] arc seconds with the primary being an A-type main-sequence star of spectral class A0 V,[3] while the secondary component is a similar A-type star.[9] The primary is 98 million years old with 2.6 times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 274 km/s.[6] It is radiating 31[7] times the luminosity of the Sun from its photosphere at an effective temperature of 11,223 K. The system is a source of X-ray emission with a luminosity of 184.3×1020 W, which is considered unusual since A-type stars are not expected to display magnetic activity.[3]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Corben1968 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference David2015 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. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).