Tau2 Capricorni

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Tau2 Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.20 (5.77 + 9.5 + 6.19)[2]
Characteristics
Spectral type B6III + ? + B6IV[2]
Astrometry
Radial velocity (Rv)Template:Val[3] km/s
Proper motion (μ) RA: +2.62[1] mas/yr
Dec.: −19.46[1] mas/yr
Parallax (π)2.87±0.65 mas[1]
Distanceapprox. Template:Rnd ly
(approx. Template:Rnd pc)
Orbit[4]
Primaryτ2 Cap A
Companionτ2 Cap B
Period (P)420 yr
Semi-major axis (a)0.48″
Eccentricity (e)0.73
Inclination (i)75°
Longitude of the node (Ω)93.0°
Periastron epoch (T)1915.0
Argument of periastron (ω)
(secondary)		270°
Details
A
MassTemplate:Val[5] Template:Solar mass
Luminosity (bolometric)1,893[5] Template:Solar luminosity
Surface gravity (log g)3.90[6] cgs
Temperature15,439[6] K
Metallicity [Fe/H]0.14[6] dex
Rotational velocity (v sin i)170[7] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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Tau2 Capricorni, Latinized from τ2 Capricorni, is a triple star[2] system in the constellation Capricornus. It is approximately 1,100 light years from Earth based on parallax. The system has a blue-white hue and a combined apparent visual magnitude of +5.20.[2] Because it is positioned near the ecliptic, τ2 Capricorni can be occulted by the Moon.[9]

The primary, component A, is a B-type giant with a stellar classification of B6III and an apparent magnitude of +5.8.[2] It has five[5] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 170 km/s.[7] The star is radiating 1,893[5] times the luminosity of the Sun from its photosphere at an effective temperature of 15,439 K.[6]

At an angular separation of only 0.34 arcseconds is the companion, component B, a B-type subgiant star with a class of B6IV[2] and an apparent magnitude of +6.3. These two stars orbit around their common centre of mass once every 420 years.[4] A possible third component with an apparent magnitude of +9.5,[2] detected by studying the star during occultation, is located 0.052 arcseconds away from the A component.[10]

References

Template:Reflist

Template:Stars of Capricornus

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kharchenko2007
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Hartkopf2006
  5. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Hohle2010
  6. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Koleva2012
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Abt2002
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Radick1980
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named bsc
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