{{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 | 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<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 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<ref name=DeRosa2012/><ref name=Eggleton2008/> system in the northern constellation of Hercules. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.82.<ref name=Anderson2012/> Based upon parallax measurements, the system is located 180 light years away from the Sun. It is moving closer to the Earth with a heliocentric radial velocity of −1.6 km/s.<ref name=Anderson2012/>
[[File:V637HerLightCurve.png|thumb|left|A light curve for V637 Herculis, plotted from ''TESS'' data<ref name=MAST/>]] The primary member, designated component A, is a magnetic<ref name=Bychkov2012/> chemically peculiar star<ref name=Sikora2018/> with a stellar classification of A1VpSiSrCr,<ref name=Abt1981/> appearing as an A-type main-sequence star with abnormal abundances of silicon, strontium, and chromium. It is an alpha<sup>2</sup> Canum Venaticorum variable that ranges in brightness from visual magnitude 4.78 down to 4.85 with a period of 3.8567 days.<ref name=Samus2017/> The star is about 525 million years old with a projected rotational velocity of 23 km/s. It has 2.2 times the mass of the Sun and 2.3 times the Sun's radius. The star is radiating 29.5 times the Sun's luminosity from its photosphere at an effective temperature of 8,840 K.<ref name=Sikora2018/>
The remaining components form a binary star system with an orbital period of 56 years, an angular semimajor axis of {{Val|0.279|ul=arcsecond}}, and an eccentricity of 0.13.<ref name=DeRosa2012/> They have an 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 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