{{Short description|Star in the constellation Taurus}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Taurus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=47 Tauri |x=650|y=742 }} | caption = Location of 47 Tauri (circled in red) }} {{Starbox observe |epoch=J2000 |constell=Taurus |ra={{RA|04|13|56.38482}}<ref name=HIP>{{cite journal|title=Validation of the new Hipparcos reduction|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid = 18759600}}</ref> |dec={{DEC|+09|15|49.7729}}<ref name=HIP/> |appmag_v=4.89<ref name=SIMBAD>{{cite simbad|title=* 47 Tau|access-date=2 May 2017}}</ref><br/>(5.05 + 7.32)<ref name=ORB6/> }} {{Starbox character |class=G5III + A7V:<ref>{{cite journal|bibcode=1969AJ.....74..689S|doi=10.1086/110845|title=The masses of stars above the main sequence|journal=The Astronomical Journal|volume=74|pages=689|year=1969|last1=Stephenson|first1=C. B.|last2=Sanwal|first2=N. B.|doi-access=free}}</ref> |b-v=+0.82<ref name=EgUBV>{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|date=1986|bibcode= 1986EgUBV........0M}}</ref> |u-b=+0.46<ref name=EgUBV/> }} {{Starbox astrometry |radial_v=-8.2 ± 0.4<ref name=Kang>{{cite journal|bibcode=2011ApJ...736...87K|doi=10.1088/0004-637X/736/2/87|arxiv=1105.3083|title=Abundances of Refractory Elements for G-Type Stars with Extrasolar Planets|journal=The Astrophysical Journal|volume=736|issue=2|pages=87|year=2011|last1=Kang|first1=Wonseok|last2=Lee|first2=Sang-Gak|last3=Kim|first3=Kang-Min|s2cid=118382154}}</ref> |prop_mo_ra=-10.31<ref name=HIP/> |prop_mo_dec=-30.01<ref name=HIP/> |parallax=9.83 |p_error=0.64 |parallax_footnote=<ref name=HIP/> }} {{Starbox orbit |reference=<ref name=ORB6>{{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|work=United States Naval Observatory|access-date=2 May 2017|archive-date=1 August 2017|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}}</ref> |period=479 |axis=1.053 |inclination=128.6 |node=52.9 |periastron=B 1816.6 |eccentricity=0.910 |periarg=263.0 |k1= }} {{Starbox detail |component1=47 Tau A |mass= |radius=12.9<ref name=CADARS>{{cite journal|display-authors=1|author1=Pasinetti Fracassini, L. E.|author2=Pastori, L.|author3=Covino, S.|author4=Pozzi, A.|title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics|journal=Astronomy & Astrophysics|volume=367|issue=2|pages=521–24|date=2001|bibcode=2001A&A...367..521P|doi=10.1051/0004-6361:20000451|arxiv=astro-ph/0012289|s2cid=425754}}</ref> |temperature=5117 ± 58<ref name=Kang/> |luminosity= |gravity=2.67 ± 0.11<ref name=Kang/> |metal_fe=-0.10 ± 0.08<ref name=Kang/> |rotational_velocity= |age_gyr= }} {{Starbox catalog |names={{odlist|BD=+08°652|HD=26722|HIP=19740|HR=1311|SAO=111674}} }} {{Starbox reference |Simbad=47+Tau|sn=47 Tau |Simbad2=47+Tau+A|sn2=47 Tau A |Simbad3=47+Tau+B|sn3=47 Tau B }} {{Starbox end}} '''47 Tauri''' (abbreviated to '''47 Tau''') is a binary star in the zodiac constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 330 light-years (102 parsecs) from Earth. The system has a combined apparent magnitude of about 4.89,<ref name=SIMBAD/> meaning it can be faintly seen with the naked eye, according to the Bortle scale.
47 Tauri is a visual binary, meaning that the two components can be resolved, and the orbit is derived from the positions of the two stars. The primary component is a G-type giant. Its radius is about 13 times that of the Sun.<ref name=CADARS/> The companion is likely a white-colored A-type main-sequence star that is fainter. The two stars are separated about 1.3 arcseconds away,<ref name=SIMBAD/> and because of their large separation, the two stars take some 479 years to complete an orbit.<ref name=ORB6/>
==References== {{reflist}}
{{Stars of Taurus}}
Category:G-type giants Category:A-type main-sequence stars Category:Binary stars Category:Taurus (constellation) Tauri, 047 BD+08 0652 026722 019740 1311