# 7 Tauri

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> Markdown URL: https://mediated.wiki/source/7_Tauri.md
> Source: https://en.wikipedia.org/wiki/7_Tauri
> Source revision: 1187656206
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Multiple star system in the constellation Taurus}}
{{Starbox begin}}
{{Starbox observe 2s
 | epoch       = J2000
 | constell    = [Taurus](/source/Taurus_(constellation))
 | component1  = A
 | ra1         = {{RA|03|34|26.629}}<ref name=dr3a/>
 | dec1        = {{DEC|+35|27|51.86}}<ref name=dr3a/>
 | appmag_v1   = 6.58<ref name=tycho/>
 | component2  = B
 | ra2         = {{RA|03|34|26.633}}<ref name=dr3b/>
 | dec2        = {{DEC|+35|27|52.17}}<ref name=dr3b/>
 | appmag_v2   = 6.84<ref name=tycho/>
}}
{{Starbox character
 | component1  = A
 | class       = A3V<ref name=tokovinin1998/>
 | b-v         = +0.13<ref name=tokovinin1998/>
 | u-b         =
 | variable    = 
 | component2  = B
 | class2      = A3V<ref name=tokovinin1998/>
 | b-v2        = +0.13<ref name=tokovinin1998/>
 | u-b2        =
 | variable2   = 
}}
{{Starbox astrometry
 | radial_v    = +28.1<ref name=rv/>
 | prop_mo_ra  = +9.908
 | prop_mo_dec = −28.201
 | pm_footnote = <ref name=dr3a/>
 | parallax    = 5.4993
 | p_error     = 0.0587
 | parallax_footnote = <ref name=dr3a/>
 | absmag_v    = +0.5/+0.6<ref name=tokovinin1998/>
}}
{{Starbox orbit
 | reference = <ref name=malkov2012/>
 | period = 522.16
 | eccentricity = 0.679
 | axis = 0.625
}}
{{Starbox detail
 | component1  = A
 | mass        = 2.5<ref name=tokovinin1998/>
 | radius      = 9.0<ref name=dr2a/>
 | gravity     =
 | metal_fe    =
 | temperature = 8,551<ref name=ticv8/>
 | luminosity  = 52<ref name=dr2a/>
 | rotational_velocity =
 | rotation    = 
 | age_myr     =
 | component2  = B
 | mass2       = 2.5<ref name=tokovinin1998/>
 | temperature2 = 
}}
{{Starbox catalog
 | names = {{odlist | F=7&nbsp;Tau | BD=+23°473 | HD=22091 | HIP=16664 | HR=1086 }}<ref name="SIMBAD"/>
}}
{{Starbox reference
 | Simbad = 6+Tau
}}
{{Starbox end}}

'''7 Tauri''' is a [multiple star](/source/multiple_star) in the northern [constellation](/source/constellation) of [Taurus](/source/Taurus_(constellation)). It has a combined [apparent visual magnitude](/source/apparent_visual_magnitude) of 5.95,<ref name=xhip/> so, according to the [Bortle scale](/source/Bortle_scale), it is faintly visible from suburban skies at night. Measurements made with the [Gaia](/source/Gaia_(spacecraft)) spacecraft show an annual [parallax](/source/parallax) shift of {{val|5.5|ul=mas}}, which is equivalent to a distance of around 593&nbsp;[light year](/source/light_year)s from the Sun.

7 Tauri is a binary star with two nearly equal components about {{val|0.7|ul="}} apart, designated as A and B.  The spectrum of each star matches a [stellar classification](/source/stellar_classification) of A7V.<ref name=tokovinin1998/>  {{val|22|u="}} away is a 10th-magnitude star, component C, which is itself a [spectroscopic binary](/source/spectroscopic_binary).  In the past, these stars had been treated as a single system, but they are now known to have different [proper motion](/source/proper_motion)s and somewhat different distances.<ref name=tokovinin1998/>

==References==
{{Reflist|refs=

<ref name=dr2a>{{Cite Gaia DR3|68486384567412992}}</ref>

<ref name=dr3a>{{Cite Gaia DR3|68486384567412992}}</ref>

<ref name=dr3b>{{Cite Gaia DR3|68486380271398912}}</ref>

<ref name=ticv8>{{cite journal |bibcode=2018AJ....156..102S |title=The TESS Input Catalog and Candidate Target List |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Pepper |first3=Joshua |last4=Paegert |first4=Martin |last5=De Lee |first5=Nathan |last6=Torres |first6=Guillermo |last7=Latham |first7=David W. |last8=Charpinet |first8=Stéphane |last9=Dressing |first9=Courtney D. |last10=Huber |first10=Daniel |last11=Kane |first11=Stephen R. |last12=Lépine |first12=Sébastien |last13=Mann |first13=Andrew |last14=Muirhead |first14=Philip S. |last15=Rojas-Ayala |first15=Bárbara |last16=Silvotti |first16=Roberto |last17=Fleming |first17=Scott W. |last18=Levine |first18=Al |last19=Plavchan |first19=Peter |author20=the TESS Target Selection Working Group |journal=The Astronomical Journal |year=2018 |volume=156 |issue=3 |page=102 |doi=10.3847/1538-3881/aad050 |arxiv=1706.00495 |s2cid=73582386 |doi-access=free }}</ref>

<ref name=tycho>{{cite journal |last1=Fabricius |first1=C. |last2=Høg |first2=E. |last3=Makarov |first3=V. V. |last4=Mason |first4=B. D. |last5=Wycoff |first5=G. L. |last6=Urban |first6=S. E. |title=The Tycho double star catalogue |journal=Astronomy & Astrophysics |date=March 2002 |volume=384 |issue=1 |pages=180–189 |doi=10.1051/0004-6361:20011822 |issn=0004-6361 |bibcode=2002A&A...384..180F |doi-access=free}}</ref>

<ref name=xhip>{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644 }}</ref>

<ref name=tokovinin1998>{{cite journal |bibcode=1998AstL...24..288T |title=New spectroscopic components in six multiple systems |last1=Tokovinin |first1=A. A. |journal=Astronomy Letters |year=1998 |volume=24 |issue=3 |page=288 }}</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=malkov2012>{{cite journal
 | display-authors=1
 | last1=Malkov | first1=O. Yu.
 | last2=Tamazian | first2=V. S.
 | last3=Docobo | first3=J. A.
 | last4=Chulkov | first4=D. A.
 | title=Dynamical Masses of a Selected Sample of Orbital Binaries
 | journal=Astronomy & Astrophysics
 | volume=546 | id=A69 | pages=5 | date=2012
 | doi=10.1051/0004-6361/201219774
 | bibcode=2012A&A...546A..69M
 | doi-access=free
 }}</ref>

<ref name="SIMBAD">{{cite simbad
 | title=7 Tau
 | access-date=2022-09-20
}}</ref>

}}

{{Stars of Taurus}}
{{Sky|03|34|26.6|+|35|27|52}}

Category:Taurus (constellation)
Tauri, 007
1086
Category:Durchmusterung objects
022091
016664
Category:A-type main-sequence stars

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Adapted from the Wikipedia article [7 Tauri](https://en.wikipedia.org/wiki/7_Tauri) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/7_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.