Sigma Capricorni

Sigma Capricorni
Location of σ Capricorni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus
Right ascension 20h 19m 23.60402s[1]
Declination −19° 07′ 06.6967″[1]
Apparent magnitude (V) +5.31[2]
Characteristics
Spectral type K2 III[3]
U−B color index +1.56[2]
B−V color index +1.43[2]
Astrometry
Radial velocity (Rv)−9.64±0.16[1] km/s
Proper motion (μ) RA: +8.07[4] mas/yr
Dec.: −11.31[4] mas/yr
Parallax (π)3.0609 ± 0.1194 mas[1]
Distance1,070 ± 40 ly
(330 ± 10 pc)
Absolute magnitude (MV)−2.38[5]
Details
Mass6.3±0.7[6] M☉
Radius67.5+4.2
−6.0[1] R☉
Luminosity1,392±64[1] L☉
Temperature4292+204
−127[1] K
Age60.5±17.2[6] Myr
Other designations
σ Cap, CD−19°5776, FK5 3625, HD 193150, HIP 100195, HR 7761, SAO 163445, WDS J20194-1907A[7]
Database references
SIMBADdata

Sigma Capricorni, Latinized from σ Capricorni, is a solitary[8] star in the southern constellation of Capricornus,[7] 0.5 degree north of the ecliptic. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.31.[2] The star is about 1,070 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −9.6 km/s.[1]

This object is an evolved, K-type giant star with a stellar classification of K2 III.[3] Having exhausted the supply of hydrogen at its core, it has expanded and now has around 67.5[1] times the girth of the Sun. The star is about 60.5[6] million years old with 6.3[6] times the mass of the Sun. It is radiating 1,392[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,292 K.[1]

A magnitude 9.43 visual companion is at an angular separation of 55.90″ along a position angle of 179°, as of 2016.[9]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Fernie1983 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1988 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference vanLeeuwen2007 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 Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).