Editing Alpha Herculis (section)

{{Short description|Multiple star system in the constellation Hercules}}
{{Starbox begin
 | name = α Herculis
}}
{{Starbox image
 | image=
{{Location mark
|image=Hercules constellation map.svg|alt=|float=center|width=240
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=α Herculis
|x=596|y=896
}}
|caption=Location of α Herculis (circled)
}}
{{Starbox observe 2s
 | epoch      = J2000
 | constell = [[Hercules (constellation)|Hercules]]
 | component1 = A
 | ra1        = {{RA|17|14|38.853}}<ref name=tycho2/>
 | dec1       = {{DEC|+14|23|25.34}}<ref name=tycho2/>
 | appmag_v1  = 3.350<ref name=tycho2/> ({{Val|2.7|-|4.0}}<ref name=gcvs/>)
 | component2 = B
 | ra2        = {{RA|17|14|39.181}}<ref name=tycho2/>
 | dec2       = {{DEC|+14|23|23.98}}<ref name=tycho2/>
 | appmag_v2  = 5.322<ref name=tycho2/>
}}
{{Starbox character
 | component = A
 | type      = [[Asymptotic giant branch|AGB]]<ref name="moravveji"/>
 | class     = M5 Ib-II<ref name="moravveji"/>
 | b-v       = +1.45<ref name=ducati/>
 | u-b       = +1.01<ref name=ducati/>
 | variable  = [[Semiregular variable|SRc]]<ref name=gcvs/>
 | component2 = B
 | class2     = G8III + A9IV-V<ref name="moravveji"/>
 | b-v2       =
 | u-b2       =
 | variable2  =
}}
{{Starbox astrometry
 | prop_mo_ra  = −7.32<ref name="LEEUWEN"/>
 | prop_mo_dec = 36.07<ref name="LEEUWEN"/>
 | parallax = 9.07
 | p_error  = 1.32
 | parallax_footnote = <ref name="LEEUWEN"/>
 | absmag_v  = −2.3<ref name=huang/> + {{nowrap|1.8 + 2.8<ref name=reimers/>}}
}}
{{Starbox detail
 | component1 = A
 | mass   = {{Val|2.5|1.6|1.1}}<ref name=moravveji2011/>
 | radius = 284 ± 60, {{nowrap|{{Val|264|-|303}}}}<ref name="moravveji"/>
 | luminosity = {{Val|7244|-|9333|fmt=commas}}<ref name="moravveji"/>
 | temperature = {{Val|3155|-|3365|fmt=commas}}<ref name="moravveji"/>
 | metal  = 
 | gravity = {{Val|−0.41|0.19}}<ref name=aaa465_2_593/>
 | rotational_velocity = 
}}
{{Starbox detail|no_heading=y
 | component1 = Ba
 | mass   = ~2.5<ref name="moravveji"/>
 | radius =
 | luminosity = 126<ref name="moravveji"/>
 | temperature = 4,900<ref name="moravveji"/>
 | component2 = Bb
 | mass2   = ~2<ref name="moravveji"/>
 | radius2 =
 | luminosity2 = 26<ref name="moravveji"/>
 | temperature2 = 7,350<ref name="moravveji"/>
 | age_gyr2 = {{Val|0.41|-|1.25}}<ref name="moravveji"/>
}}
{{Starbox catalog
 |names=Ras Algethi, Rasalgethi, [[Bayer designation|α Her]], [[Flamsteed designation|64&nbsp;Her]], [[Bonner Durchmusterung|BD]]+14°3207, [[Hipparcos catalogue|HIP]]&nbsp;84345, [[Catalog of Components of Double and Multiple Stars|CCDM]]&nbsp;J17146+1424, [[American Association of Variable Star Observers|AAVSO]]&nbsp;1710+14, [[Washington Double Star Catalog|WDS]]&nbsp;J17146+1423<ref name="SIMBAD">{{cite simbad | title = alf Her | access-date = 2010-09-26 }}</ref>
 |component1=A
 |names1=[[Henry Draper Catalogue|HD]]&nbsp;156014, [[Harvard Revised catalogue|HR]]&nbsp;6406, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;102680
 |component2=B
 |names2=[[Henry Draper Catalogue|HD]]&nbsp;156015, [[Harvard Revised catalogue|HR]]&nbsp;6407, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;102681
}}
{{Starbox reference
 | Simbad=HIP+84345|sn=α Her
 | Simbad2=HD+156014|sn2=A
 | Simbad3=HD+156015|sn3=B
}}
{{Starbox end}}

'''Alpha Herculis''' ('''α Herculis''', abbreviated '''Alpha Her''', '''α Her'''), also designated '''Rasalgethi''' and '''64 Herculis''', is a [[Star system|multiple star system]] in the [[constellation]] of [[Hercules (constellation)|Hercules]]. Appearing as a single point of light to the naked eye, it is resolvable into a number of components through a telescope. It has a combined [[apparent magnitude]] of 3.08, although the brightest component is variable in brightness. Based on [[stellar parallax|parallax]] measurements obtained during the [[Hipparcos]] mission, it is approximately 360 [[light-year]]s (110&nbsp;[[parsec]]s) distant from the [[Sun]]. It is also close to another bright star [[Alpha Ophiuchi|Rasalhague]] in the vicinity.