# 72 Tauri

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> Source: https://en.wikipedia.org/wiki/72_Tauri
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{{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](/source/J2000.0)
 | equinox = [J2000.0](/source/J2000.0) ([ICRS](/source/International_Celestial_Reference_System))
 | constell = [Taurus](/source/Taurus_(constellation))
 | 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](/source/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](/source/binary_star) in the [zodiac](/source/zodiac) constellation of [Taurus](/source/Taurus_(constellation)). It is faintly visible to the naked eye with an [apparent visual magnitude](/source/apparent_visual_magnitude) of +5.5, although only 0.29° from the brighter [υ Tauri](/source/%CF%85_Tauri).  Based upon an annual [parallax shift](/source/stellar_parallax) of {{val|7.9|ul=mas}} seen from Earth, it is around 410&nbsp;[light year](/source/light_year)s from the [Sun](/source/Sun).

==Properties==
72 Tauri is a [B-type main sequence star](/source/B-type_main_sequence_star) with a [stellar classification](/source/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](/source/solar_radius) and 185 times [its luminosity](/source/solar_luminosity).<ref name=dr3/>

Occasionally this star system is given the [Bayer designation](/source/Bayer_designation) ''υ<sup>2</sup> Tauri'' with [υ Tauri](/source/%CF%85_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](/source/Hyades_(star_cluster)) [open cluster](/source/open_cluster), it is much further away.<ref name=dr3/>

72 Tauri lies near the [ecliptic](/source/ecliptic) and can be [occulted by the moon](/source/lunar_occultation).  Observations of an [occultation](/source/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

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Adapted from the Wikipedia article [72 Tauri](https://en.wikipedia.org/wiki/72_Tauri) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/72_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.