# 47 Tauri

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{{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](/source/Taurus_(constellation))
|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{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|date=1986|bibcode= 1986EgUBV........0M}}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](/source/Besselian_year) 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](/source/binary_star) in the zodiac [constellation](/source/constellation) of [Taurus](/source/Taurus_(constellation)). [Parallax](/source/Stellar_parallax) measurements made by the [Hipparcos](/source/Hipparcos) spacecraft put it at a distance of about 330 [light-year](/source/light-year)s (102 [parsec](/source/parsec)s) from [Earth](/source/Earth). The system has a combined [apparent magnitude](/source/apparent_magnitude) of about 4.89,<ref name=SIMBAD/> meaning it can be faintly seen with the [naked eye](/source/naked_eye), according to the [Bortle scale](/source/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](/source/G-type_star) [giant](/source/giant_star). Its radius is about 13 times that of the [Sun](/source/Sun).<ref name=CADARS/> The companion is likely a white-colored [A-type main-sequence star](/source/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

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Adapted from the Wikipedia article [47 Tauri](https://en.wikipedia.org/wiki/47_Tauri) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/47_Tauri?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.