# 52 Herculis

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> Source: https://en.wikipedia.org/wiki/52_Herculis
> Source revision: 1356242494
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{{Short description|Star in the constellation Hercules}}
{{Starbox begin}}
{{Starbox image
| image =
{{Location mark
|image=Hercules constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=52 Herculis
|x=668|y=192
}}
| caption = Location of 52 Herculis (circled in red)
}}
{{Starbox observe
 | epoch       = J2000
 | constell    = [Hercules](/source/Hercules_(constellation))
 | ra          = {{RA|16|49|14.21821}}<ref name=vanLeeuwen2007/>
 | dec         = {{DEC|+45|58|59.9620}}<ref name=vanLeeuwen2007/>
 | appmag_v    = 4.82<ref name=Anderson2012/> {{nowrap|(4.87 + 8.85[9.0 + 9.1])}}<ref name=Eggleton2008/>
}}
{{Starbox character
 | type        = main sequence<ref name=Eggleton2008/>
 | class       = A1VpSiSrCr<ref name=Abt1981/> + K0V?<ref name=Eggleton2008/>
 | b-v         = {{Val|0.087|0.003}}<ref name=Anderson2012/>
 | u-b         = 
 | variable    = [α<sup>2</sup> CVn](/source/Alpha2_Canum_Venaticorum_variable)<ref name=Samus2017/>
}}
{{Starbox astrometry
 | radial_v    = {{Val|−1.6|0.5}}<ref name=Anderson2012/>
 | prop_mo_ra  = +22.57<ref name=vanLeeuwen2007/>
 | prop_mo_dec = −51.35<ref name=vanLeeuwen2007/>
 | parallax    = 18.10
 | p_error     = 0.34
 | parallax_footnote = <ref name=vanLeeuwen2007/>
 | absmag_v    = {{nowrap|1.16 + 5.47 + 5.57}}<ref name=DeRosa2012/>
}}
{{Starbox orbit
 | reference = <ref name=DeRosa2012/>
 | primary = 52 Her A
 | name = 52 Her B
 | period = {{Val|56.4|0.3}}
 | axis = {{Val|0.279|0.005}}
 | eccentricity = {{Val|0.13|0.02}}
 | inclination = {{Val|37.4|2.6|2.8}}
 | node = 57.5
 | periastron = 1991.2
 | periarg = 69.4
}}
{{Starbox detail
 | source      = <ref name=Sikora2018/>
 | component1  = 52 Her A
 | mass        = {{Val|2.19|0.14|0.22}}
 | radius      = {{Val|2.30|0.11}}
 | temperature = {{Val|8840|190|fmt=commas}}
 | luminosity  = {{Val|29.5|2.1|2.0}}
 | gravity     = {{Val|4.06|0.05|0.06}}
 | metal_fe    = 
 | rotational_velocity = {{Val|23.2|1.4}}
 | age_myr     = {{Val|525|234|162}}
}}
{{Starbox catalog
 | names={{odlist | F=52&nbsp;Her | V=V637 Her | BD=+46°2220 | HD=152107 | HIP=82321 | HR=6254 | SAO=46305 | WDS=J16492+4559 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad=52+Her
}}
{{Starbox end}}

'''52 Herculis''' is a [triple star](/source/triple_star)<ref name=DeRosa2012/><ref name=Eggleton2008/> system in the northern [constellation](/source/constellation) of [Hercules](/source/Hercules_(constellation)). It is visible to the naked eye as a faint point of light with a combined [apparent visual magnitude](/source/apparent_visual_magnitude) of 4.82.<ref name=Anderson2012/> Based upon [parallax measurements](/source/stellar_parallax), the system is located 180&nbsp;[light year](/source/light_year)s away from the Sun. It is moving closer to the Earth with a heliocentric [radial velocity](/source/radial_velocity) of −1.6&nbsp;km/s.<ref name=Anderson2012/>

[[File:V637HerLightCurve.png|thumb|left|A [light curve](/source/light_curve) for V637 Herculis, plotted from ''[TESS](/source/Transiting_Exoplanet_Survey_Satellite)'' data<ref name=MAST/>]]
The primary member, designated component A, is a magnetic<ref name=Bychkov2012/> [chemically peculiar star](/source/chemically_peculiar_star)<ref name=Sikora2018/> with a [stellar classification](/source/stellar_classification) of A1VpSiSrCr,<ref name=Abt1981/> appearing as an [A-type main-sequence star](/source/A-type_main-sequence_star) with abnormal abundances of silicon, strontium, and chromium. It is an [alpha<sup>2</sup> Canum Venaticorum variable](/source/Alpha2_Canum_Venaticorum_variable) that ranges in brightness from visual magnitude 4.78 down to 4.85 with a period of 3.8567&nbsp;days.<ref name=Samus2017/> The star is about 525&nbsp;million years old with a [projected rotational velocity](/source/projected_rotational_velocity) of 23&nbsp;km/s. It has 2.2 times the [mass of the Sun](/source/mass_of_the_Sun) and 2.3 times the [Sun's radius](/source/Sun's_radius). The star is radiating 29.5 times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/photosphere) at an [effective temperature](/source/effective_temperature) of 8,840&nbsp;K.<ref name=Sikora2018/>

The remaining components form a [binary star](/source/binary_star) system with an [orbital period](/source/orbital_period) of 56&nbsp;years, an angular [semimajor axis](/source/semimajor_axis) of {{Val|0.279|ul=arcsecond}}, and an [eccentricity](/source/orbital_eccentricity) of 0.13.<ref name=DeRosa2012/> They have an [angular separation](/source/angular_separation) of {{Val|1.78|u=arcsecond}} from the primary.<ref name=Eggleton2008/> The total mass of the pair is {{Val|1.16|0.09|ul=solar mass}}<ref name=DeRosa2012/> and they have a combined visual magnitude of 8.85.<ref name=Eggleton2008/> The brighter member of this pair is a suspected [K-type main-sequence star](/source/K-type_main-sequence_star) with a class of K0V.

==References==
<references>
<ref name=SIMBAD>{{cite simbad | title=52 Her | access-date=2019-06-14 }}</ref>

<ref name=MAST>{{cite web
 | 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=28 November 2022}}</ref>

<ref name=Anderson2012>{{citation
 | 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 | postscript=. }}</ref>

<ref name=vanLeeuwen2007>{{citation
 | title=Validation of the new Hipparcos reduction
 | last1=van Leeuwen | first1=F. | postscript=.
 | journal=Astronomy and Astrophysics
 | volume=474 | issue=2 | pages=653–664 | year=2007
 | arxiv=0708.1752 | bibcode=2007A&A...474..653V
 | doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}</ref>

<ref name=Eggleton2008>{{citation
 | 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 | postscript=.
 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref>

<ref name=Samus2017>{{citation | postscript=.
 | display-authors=1 | last1=Samus | first1=N. N.
 | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
 | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
 | title=General Catalogue of Variable Stars
 | version=5.1 | journal=Astronomy Reports
 | year=2017 | volume=61 | issue=1 | pages=80–88
 | bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085 | s2cid=125853869 }}</ref>

<ref name=Abt1981>{{citation
 | last1=Abt | first1=H. A. | postscript=.
 | title=Visual multiples. VII - MK classifications
 | journal=The Astrophysical Journal Supplement Series
 | volume=45 | pages=437 | year=1981
 | bibcode=1981ApJS...45..437A | doi=10.1086/190719 }}</ref>

<ref name=Sikora2018>{{citation | display-authors=1
 | title=A Volume-Limited Survey of mCP Stars Within 100pc I: Fundamental Parameters and Chemical Abundances
 | last1=Sikora | first1=J. | last2=Wade | first2=G. A.
 | last3=Power | first3=J. | last4=Neiner | first4=C.
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=483 | issue=2 | pages=2300–2324 | date=February 2019
 | arxiv=1811.05633 | doi=10.1093/mnras/sty3105
 | doi-access=free
 | bibcode=2019MNRAS.483.2300S | s2cid=119089236
 | postscript=. }}</ref>

<ref name=DeRosa2012>{{citation | display-authors=1
 | last1=De Rosa | first1=R. J. | last2=Patience | first2=J.
 | last3=Vigan | first3=A. | last4=Wilson | first4=P. A.
 | last5=Schneider | first5=A. | last6=McConnell | first6=N. J.
 | last7=Wiktorowicz | first7=S. J. | last8=Marois | first8=C.
 | last9=Song | first9=I. | last10=MacIntosh | first10=B.
 | last11=Graham | first11=J. R. | last12=Bessell | first12=M. S.
 | last13=Doyon | first13=R. | last14=Lai | first14=O.
 | title=The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=422 | issue=4 | pages=2765 | year=2012
 | bibcode=2012MNRAS.422.2765D | doi=10.1111/j.1365-2966.2011.20397.x
 | doi-access=free | arxiv=1112.3666 | s2cid=102487103 | postscript=. }}</ref>

<ref name=Bychkov2012>{{citation
 | title=Magnetic field of the Ap star 52 Her
 | last1=Bychkov | first1=V. D. | last2=Bychkova | first2=L. B.
 | last3=Madej | first3=J. | last4=Panferov | first4=A. A.
 | display-authors=1 | journal=Astrophysical Bulletin
 | volume=67 | issue=2 | pages=207–215 | date=April 2012
 | doi=10.1134/S199034131202006X | bibcode=2012AstBu..67..207B | s2cid=120468594 }}</ref>
</references>

{{Stars of Hercules}}

Category:A-type main-sequence stars
Category:Ap stars
Category:Alpha2 Canum Venaticorum variables
Category:K-type main-sequence stars
Category:Triple stars
Category:Hercules (constellation)
BD+46 2220
Herculis, 052
152107
082321
6254
Herculis, V637

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Adapted from the Wikipedia article [52 Herculis](https://en.wikipedia.org/wiki/52_Herculis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/52_Herculis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.