{{short description|Star in the constellation of Taurus}} {{Starbox begin}} {{Starbox image | image= {{Location mark |image=Taurus constellation map.svg|alt=|float=center|width=240 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=72 Tauri |x=552|y=360 }} |caption=Location of 72 Tauri (circled) }} {{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Taurus | ra = {{RA|04|27|17.4508}}<ref name=dr3/> | dec = {{DEC|+22|59|46.778}}<ref name=dr3/> | appmag_v = 5.514<ref name=tycho2/> }} {{Starbox character | type = main sequence<ref name=dr3/> | class = B7V<ref name=mk/> | b-v = −0.10<ref name=hr/> | u-b = −0.48<ref name=hr/> }} {{Starbox astrometry | radial_v = {{Val|32.2|1.1}}<ref name=rv/> | prop_mo_ra = −1.409<ref name=dr3/> | prop_mo_dec = −13.722<ref name=dr3/> | parallax = 7.9390 | p_error = 0.398 | parallax_footnote = <ref name=dr3/> | absmag_v = +0.21<ref name=Anderson2012/> }} {{Starbox detail | mass = 3.47<ref name=dr3/> | radius = 2.8<ref name=dr3/> | luminosity = 185<ref name=dr3/> | temperature = 12,689<ref name=dr3/> | gravity = 3.97<ref name=dr3/> | metal_fe = | rotational_velocity = 115<ref name=ferrero2012/> | age_myr = 38<ref name=gullikson2016/> }} {{Starbox catalog | names = {{odlist | B=υ<sup>2</sup>&nbsp;Tau | F=72&nbsp;Tauri | BD=+22°699 | HD=28149 | HIP=20789 | HR=1399 }}<ref name=SIMBAD/><ref name=xref/> }} {{Starbox reference | Simbad = 72+Tau }} {{Starbox end}}

'''72 Tauri''' (abbreviated '''72 Tau''') is a possible binary star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.5, although only 0.29° from the brighter υ Tauri. Based upon an annual parallax shift of {{val|7.9|ul=mas}} seen from Earth, it is around 410&nbsp;light years from the Sun.

==Properties== 72 Tauri is a B-type main sequence star with a stellar classification of B7V.<ref name=mk/> With a mass of {{solar mass|3.48|link=y}} and an estimated age of 38&nbsp;million years,<ref name=gullikson2016/> it is 2.8 times the size of the Sun and 185 times its luminosity.<ref name=dr3/>

Occasionally this star system is given the Bayer designation ''υ<sup>2</sup> Tauri'' with υ Tauri, which is separated from it by 0.29° in the sky.<ref name=hr/> υ Tauri is a foreground star, the two are unrelated,<ref name=dr3u/> and although 72 Tauri lies near the Hyades open cluster, it is much further away.<ref name=dr3/>

72 Tauri lies near the ecliptic and can be occulted by the moon. Observations of an occultation in 1985 showed that it was a binary star with the two components separated by {{val|0.1|ul="}}.<ref name=occultation/> There has been no confirmation of this finding and other sources list the star as single.<ref name=eggleton2008/>

==References== <references> <ref name=dr3>{{cite Gaia DR3|146100115802055168}}</ref>

<ref name=dr3u>{{cite Gaia DR3|145727729255780736}}</ref>

<ref name=tycho2>{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author1=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}</ref>

<ref name=hr>{{cite book |last1=Hoffleit |first1=D. |last2=Jaschek |first2=C. |year=1991 |title=The Bright Star Catalogue |location=New Haven |publisher=Yale University Observatory |bibcode=1991bsc..book.....H}}</ref>

<ref name=rv>{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}</ref>

<ref name=xref>{{cite journal|bibcode=2004yCat.4027....0K|title=VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)|journal=VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002)|volume=4027|last1=Kostjuk|first1=N. D.|year=2004}}</ref>

<ref name=mk>{{cite journal | title=B- and A-type Stars in the Taurus-Auriga Star-forming Region | display-authors=1 | last1=Mooley | first1=Kunal | last2=Hillenbrand | first2=Lynne | last3=Rebull | first3=Luisa | last4=Padgett | first4=Deborah | last5=Knapp | first5=Gillian | journal=The Astrophysical Journal | volume=771 | issue=2 | id=110 | pages=24 | date=July 2013 | arxiv=1306.0598 | bibcode=2013ApJ...771..110M | doi=10.1088/0004-637X/771/2/110 | s2cid=2176170 }}</ref>

<ref name=gullikson2016>{{cite journal | last1 = Gullikson | first1 = Kevin | last2 = Kraus | first2 = Adam | last3 = Dodson-Robinson | first3 = Sarah | title = The Close Companion Mass-ratio Distribution of Intermediate-mass Stars | journal = The Astronomical Journal | date = 25 July 2016 | volume = 152 | issue = 2 | page = 40 | eissn = 1538-3881 | doi = 10.3847/0004-6256/152/2/40 | bibcode = 2016AJ....152...40G | arxiv = 1604.06456 | doi-access = free}}</ref>

<ref name=ferrero2012>{{cite journal | title=High Ionization Species in the Nearby Interstellar Medium from an Exhaustive Analysis of the IUE INES Database | last1=Freire Ferrero | first1=R. | last2=Morales Durán | first2=C. | last3=Halbwachs | first3=J.-L. | last4=Cabo Cubeiro | first4=A. M. | journal=The Astronomical Journal | display-authors=1 | volume=143 | issue=2 | id=28 | pages=38 | date=February 2012 | doi=10.1088/0004-6256/143/2/28 | bibcode=2012AJ....143...28F | doi-access=free }}</ref>

<ref name=eggleton2008>{{cite journal | 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 | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref>

<ref name=Anderson2012>{{cite journal | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 }}</ref>

<ref name=occultation>{{cite journal |bibcode=1987AcASn..28...39Q |title=The measurements of stellar angular diameter by photoelectric observation of lunar occultation |last1=Qian |first1=B. -C |last2=Zhu |first2=G. -L. |last3=Fan |first3=Q. -Y. |journal=Acta Astronomica Sinica |year=1987 |volume=28 |page=45 }}</ref>

<ref name=SIMBAD>{{cite simbad | title=72 Tau | access-date=2017-08-05 }}</ref> </references>

{{Stars of Taurus|state=collapsed}}

Category:B-type main-sequence stars Tauri, Upsilon Category:Taurus (constellation) Category:Durchmusterung objects Tauri, 072 020789 028149 1399