| absmag_v =
}}{{Starbox orbit
| reference = [8]
| primary = τ2 Cap A
| name = τ2 Cap B
| period = 420
| axis = 0.48
| eccentricity = 0.73
| inclination = 75
| node = 93.0
| periastron = 1915.0
| periarg = 270}}{{Starbox catalog
| names = {{odlist | B=τ2 Cap | F=14 Cap | BD=−15° 5743 | FK5=| HD=196662 | HIP=101923 | HR=7889 | SAO=163771 | ADS=14099 | CCDM=J20392-1457 | GC=28748 }}[9]
}}{{Starbox reference
| Simbad = tau+Cas
}}{{Starbox end}}
Tau2 Capricorni (τ2 Capricorni) is a triple star[3] system in the constellation Capricornus. It is approximately 1,100 light years from Earth. The system has a combined apparent magnitude of +5.20.[3] Because it is near the ecliptic, τ2 Capricorni can be occulted by the Moon, and also (rarely) by planets.
The primary component, τ2 Capricorni A, is a blue-white B-type giant with an apparent magnitude of +5.8. At a distance of only 0.34 arcseconds is the second component, τ2 Capricorni B, a blue-white B-type subgiant with an apparent magnitude of +6.3. These two stars orbit around their common centre of mass once every 420 years.[8] A possible third component with an apparent magnitude of +9.5,[3] detected by studying the star during occultation, is located 0.052 arcseconds away from the A component.
References
1. ^1 2 {{citation | display-authors=1 | last=Hartkopf | first=W. I. | last2=Mason | first2=B. D. | last3=Worley | first3=C. E. | title=Sixth Catalog of Orbits of Visual Binary Stars | publisher=United States Naval Observatory | date=June 30, 2006 | url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 | accessdate=2017-06-02 | postscript=. }}
2. ^1 2 3 4 5 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | postscript=. | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 }}
3. ^1 {{cite simbad | title=tau Cap | accessdate=2017-08-30 | postscript=. }}