Sigma Columbae

Sigma Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 56m 20.94287s[1]
Declination −31° 22′ 56.7846″[1]
Apparent magnitude (V) 5.51[2]
Characteristics
Spectral type F2 III[3]
B−V color index +0.39[2]
Astrometry
Radial velocity (Rv)+19.4±2.9[4] km/s
Proper motion (μ) RA: +0.08[1] mas/yr
Dec.: +6.04[1] mas/yr
Parallax (π)1.96 ± 0.24 mas[1]
Distanceapprox. 1,700 ly
(approx. 510 pc)
Absolute magnitude (MV)−2.98[5]
Details
Mass3.79[6] M☉
Luminosity1,312[7] L☉
Surface gravity (log g)2.02[6] cgs
Temperature6,820[8] K
Metallicity [Fe/H]−0.91[6] dex
Rotational velocity (v sin i)73.4±3.7[8] km/s
Age400[6] Myr
Other designations
σ Col, CD−31° 2848, HD 40248, HIP 28098, HR 2092, SAO 196330[9]
Database references
SIMBADdata

Sigma Columbae, Latinized from σ Columbae, is a solitary,[10] yellow-white hued star in the southern constellation of Columba. It is faintly visible to the naked eye with an apparent visual magnitude of 5.51.[2] Based upon an annual parallax shift of 1.96 mas as seen from Earth,[1] this star is located roughly 1,700 light years from the Sun.

At an age of about 400 million years,[6] the spectrum of this star suggests this is an evolved F-type giant with a stellar classification of F2 III.[3] It is spinning with a projected rotational velocity of about 74 km/s,[8] which is giving the star an oblate shape with an equatorial bulge that is 10% larger than the polar radius.[11] It has 3.79[6] times the mass of the Sun and is radiating 1,312[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 6,820 K.[8]

  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 Cite error: The named reference Hog2000 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. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Casagrande2011 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 d Cite error: The named reference AmmlerVonEiff2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).