{{Short description|Star in the constellation Taurus}} {{other stars by Bayer designation|A Tauri}} {{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=39 Tauri |x=700|y=385 }} | caption = Location of 39 Tauri (circled in red) }} {{Starbox observe | epoch = J2000 | constell = Taurus | ra = {{RA|04|05|20.258}}<ref name=GaiaDR3/> | dec = {{DEC|+22|00|32.06}}<ref name=GaiaDR3/> | appmag_v = 5.90<ref name="Ghezzi2010"/> }} {{Starbox character | type = main sequence<ref name=GaiaDR3/> | class = G5 V<ref name="Shenavrin2011"/> | b-v = +0.62<ref name="Johnson1966"/> | u-b = +0.12<ref name="Johnson1966"/> | variable = }} {{Starbox astrometry | radial_v = +24.0{{±|0.1}}<ref name="LópezSantiago2010"/> | prop_mo_ra = {{val|+172.212}} | prop_mo_dec = {{val|−130.609}} | pm_footnote = <ref name=GaiaDR3/> | parallax = 59.4728 | p_error = 0.0361 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = }} {{Starbox detail | mass = 1.10{{±|0.10}}<ref name="Ghezzi2010"/> | radius = 0.96{{±|0.07}}<ref name="Ghezzi2010"/> | gravity = 4.52{{±|0.09}}<ref name="Ghezzi2010"/> | metal_fe = 0.14{{±|0.03}}<ref name="Ghezzi2010"/> | temperature = 5,903{{±|36}}<ref name="Ghezzi2010"/> | luminosity = 1.01<ref name="Ghezzi2010"/> | rotational_velocity = 5.52<ref name="MartínezArnáiz2010"/> | rotation = 9.12<ref name="LópezSantiago2010"/> d | age_gyr = 1.0<ref name="Ghezzi2010"/> }} {{Starbox catalog | names = {{odlist | F=39 Tau | BD=+21 587 | GJ=160 | HD=25680 | HIP=19076 | HR=1262 | SAO=76438 }}<ref name="SIMBAD"/> }} {{Starbox reference | Simbad = 39+Tau | ARICNS = 00348 }} {{Starbox end}}
'''39 Tauri''' is a binary star in the northern constellation of Taurus. It has an apparent visual magnitude of 5.90, so, according to the Bortle scale, it is faintly visible from suburban skies at night. Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.0594728″, which is equivalent to a distance of around 55 light years from the Sun.
[[File:39TauLightCurve.png|thumb|left|A light curve for 39 Tauri, plotted from ''Kepler'' (K2) data<ref name=MAST/>]] 39 Tauri has been resolved into a pair of stars using speckle interferometry.<ref name=hartkopf2009/> However, many observations have failed to resolve the secondary star.<ref name="Roberts2005"/>
A stellar classification of G5 V<ref name="Shenavrin2011"/> matches that of a G-type main sequence star; the type of the secondary component is unknown. Stellar models indicate the primary component is similar in physical properties to the Sun, with 110% of the Sun's mass, 96% of the radius, and shining with almost the same luminosity.<ref name="Ghezzi2010"/> The overall metallicity of the star—the abundance of elements other than hydrogen and helium—is similar to the Sun.<ref name="Casagrande2011"/> At a relatively youthful estimated age of one billion years,<ref name="Ghezzi2010"/> it is rotating with a period of 9.12<ref name="LópezSantiago2010"/> days. Based upon Hipparcos data, it displays a mild variability with an amplitude of 0.06 magnitude.<ref name="Adelman2000"/>
The space velocity components of 39 Tauri are: –25.0(U), –14.0(V), –6.0(W). The surface activity and kinematic properties of this star are consistent with membership in the IC 2391 moving group.<ref name="Murgas2013"/> It is following an orbit through the Milky Way galaxy that has an eccentricity of 0.06 carrying it as close as {{Convert|7.34|kpc|kly|abbr=on|disp=flip}} to the Galactic Center, and as far away as {{Convert|8.21|kpc|kly|abbr=on|disp=flip}}. The orbital inclination will carry the star no further than {{Convert|10|pc|ly|abbr=on|disp=flip}} away from the galactic plane.<ref name="Casagrande2011"/>
==References== {{Reflist|refs=
<ref name=GaiaDR3>{{Cite Gaia DR3|53112944270520832}}</ref>
<ref name=hartkopf2009>{{citation | title=Speckle Interferometry at Mount Wilson Observatory: Observations Obtained in 2006-2007 and 35 New Orbits | last1=Hartkopf | first1=William I. | last2=Mason | first2=Brian D. | journal=The Astronomical Journal | volume=138 | issue=3 | pages=813–826 | date=September 2009 | doi=10.1088/0004-6256/138/3/813 | bibcode=2009AJ....138..813H | doi-access=free }}.</ref>
<ref name=MAST>{{citation | title=MAST: Barbara A. Mikulski Archive for Space Telescopes | url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html | publisher=Space Telescope Science Institute |access-date=19 September 2022}}.</ref>
<ref name="Johnson1966">{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J }}.</ref>
<ref name="Ghezzi2010">{{citation | display-authors=1 | last1=Ghezzi | first1=L. | last2=Cunha | first2=K. | last3=Smith | first3=V. V. | last4=de Araújo | first4=F. X. | last5=Schuler | first5=S. C. | last6=de la Reza | first6=R. | title=Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity | journal=The Astrophysical Journal | volume=720 | issue=2 | pages=1290–1302 | date=September 2010 | doi=10.1088/0004-637X/720/2/1290 | bibcode=2010ApJ...720.1290G | arxiv=1007.2681 | s2cid=118565025 }}.</ref>
<ref name="Shenavrin2011">{{citation | display-authors=1 | last1=Shenavrin | first1=V. I. | last2=Taranova | first2=O. G. | last3=Nadzhip | first3=A. E. | title=Search for and study of hot circumstellar dust envelopes | journal=Astronomy Reports | volume=55 | issue=1 | pages=31–81 | date=January 2011 | doi=10.1134/S1063772911010070 | bibcode=2011ARep...55...31S | s2cid=122700080 }}.</ref>
<ref name="MartínezArnáiz2010">{{citation | display-authors=1 | last1=Martínez-Arnáiz | first1=R. | last2=Maldonado | first2=J. | last3=Montes | first3=D. | last4=Eiroa | first4=C. | last5=Montesinos | first5=B. | title=Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter | journal=Astronomy and Astrophysics | volume=520 | page=A79 | date=September 2010 | doi=10.1051/0004-6361/200913725 | bibcode=2010A&A...520A..79M | arxiv=1002.4391 | s2cid=43455849}}.</ref>
<ref name="Murgas2013">{{citation | display-authors=1 | last1=Murgas | first1=F. | last2=Jenkins | first2=J. S. | last3=Rojo | first3=P. | last4=Jones | first4=H. R. A. | last5=Pinfield | first5=D. J. | title=Stellar activity as a tracer of moving groups | journal=Astronomy and Astrophysics | volume=552 | page=A27 | date=April 2013 | doi=10.1051/0004-6361/201219483 | bibcode=2013A&A...552A..27M | arxiv=1302.6935 | s2cid=7621053 }}.</ref>
<ref name="Casagrande2011">{{citation | display-authors=1 | last1=Casagrande | first1=L. | last2=Schönrich | first2=R. | last3=Asplund | first3=M. | last4=Cassisi | first4=S. | last5=Ramírez | first5=I. | last6=Meléndez | first6=J. | last7=Bensby | first7=T. | last8=Feltzing | first8=S. | title=New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey | journal=Astronomy and Astrophysics | volume=530 | page=A138 | date=June 2011 | doi=10.1051/0004-6361/201016276 | bibcode=2011A&A...530A.138C | arxiv=1103.4651 | s2cid=56118016 }}.</ref>
<ref name="LópezSantiago2010">{{citation | display-authors=1 | last1=López-Santiago | first1=J. | last2=Montes | first2=D. | last3=Gálvez-Ortiz | first3=M. C. | last4=Crespo-Chacón | first4=I. | last5=Martínez-Arnáiz | first5=R. M. | last6=Fernández-Figueroa | first6=M. J. | last7=de Castro | first7=E. | last8=Cornide | first8=M. | title=A high-resolution spectroscopic survey of late-type stars: chromospheric activity, rotation, kinematics, and age | journal=Astronomy and Astrophysics | volume=515 | page=A97 | date=May 2010 | doi=10.1051/0004-6361/200913437 | bibcode=2010A&A...514A..97L | arxiv=1002.1663 | s2cid=118640516 }}.</ref>
<ref name="Roberts2005">{{citation | display-authors=1 | last1=Roberts | first1=Lewis C. Jr. | last2=Turner | first2=Nils H. | last3=Bradford | first3=L. William | last4=ten Brummelaar | first4=Theo A. | last5=Oppenheimer | first5=Ben R. | last6=Kuhn | first6=Jeff R. | last7=Whitman | first7=Kathryn | last8=Perrin | first8=Marshall D. | last9=Graham | first9=James R. | title=Adaptive Optics Photometry and Astrometry of Binary Stars | journal=The Astronomical Journal | volume=130 | issue=5 | pages=2262–2271 | date=November 2005 | doi=10.1086/491586 | bibcode=2005AJ....130.2262R | doi-access=free }}.</ref>
<ref name="Adelman2000">{{citation | display-authors=1 | last1=Adelman | first1=S. J. | last2=Davis | first2=J. M. | last3=Lee | first3=A. S. | title=On the Variability of G0-G9 Stars | journal=Information Bulletin on Variable Stars | volume=4993 | page=1 | date=December 2000 | bibcode=2000IBVS.4993....1A }}.</ref>
<ref name="SIMBAD">{{cite simbad | title=39 Tau | access-date=2013-10-13 }}</ref>
}}
{{Stars of Taurus}} {{Sky|04|05|20.26|+|22|00|32.05}}
Category:G-type main-sequence stars Category:Astrometric binaries Category:Taurus (constellation) Tauri, A2 Tauri, 039 1262 BD+21 0587 0160 025680 019076