Editing Beta Centauri (section)

{{Short description|Triple star system in the constellation Centaurus}}
{{For|other uses of the name "Hadar"|Hadar (disambiguation)}}
{{hatnote group|
{{about-distinguish|the star system β Centauri|HD 102964{{!}}B Centauri|HD 129116{{!}}b Centauri|Alpha Centauri B{{!}}α Centauri B}}
{{for|the exoplanet|b Centauri b}}
}}
{{Starbox begin
| name=β Centauri/Hadar
}}
{{Starbox image
 | image=
{{Location mark
|image=Centaurus constellation map.svg|float=center|width=280
|alt=|label=|position=right
|mark=Red circle.svg|mark_width=12|mark_link=Beta Centauri|x=421|y=845
}}
|caption=Location of β Centauri (circled)
}}
{{Starbox observe
| epoch    = J2000
| constell = [[Centaurus]]
| ra       = {{RA|14|03|49.40535}}<ref name=aaa474_2_653/>
| dec      = {{DEC|-60|22|22.9266}}<ref name=aaa474_2_653/>
| appmag_v = 0.61<ref name=hr/>
}}
{{Starbox character
| b-v      = −0.23<ref name=hr/>
| u-b      = −0.98<ref name=hr/>
}}
{{Starbox character|no_heading=y
| component = β Cen Aa
| class    = B1&nbsp;III<ref name=aaa455_1_259/>
| variable = [[Beta Cephei variable|β Cep]]/[[Slowly pulsating B-type star|SPB]]<ref name=Pigulski16/>
| component2 = β Cen Ab
| class2    = B1&nbsp;III<ref name=aaa455_1_259/>
| variable2 =
}}
{{Starbox character|no_heading=y
| component = β Cen B
| class    = B1V?<ref name=aaa455_1_259/>
}}
{{Starbox astrometry
| radial_v = {{val|+9.59|0.23|0.21}}<ref name=Pigulski16/>
| prop_mo_ra  = −33.27
| prop_mo_dec = −23.16
| pm_footnote = <ref name=aaa474_2_653/>
| parallax = 9.04
| p_error  = 0.04
| parallax_footnote = <ref name=Pigulski16/>
| dist_footnote = <ref name=Pigulski16/>
| absmag_v = {{val|−4.9|0.2}}<ref name=schultz2019/>
}}
{{Starbox orbit
| reference = <ref name=Pigulski16/>
| primary = β Cen Aa
| name = β Cen Ab
| period = {{val|0.97720|0.00004}}
| period_unitless = {{val|356.915|0.015|ul=days}}
| axis = {{val|0.02515|0.09|0.08}}
| axis_unitless =
| eccentricity = {{val|0.8245|0.006}}
| inclination = {{val|67.68|0.12}}
| node ={{val|108.80|0.14|0.15}}
| periastron = 2452000.15202
| periarg = {{val|60.87|0.26|0.25}}
| periarg_primary =
| k1 = 62.9
| k2 = 72.35
}}
{{Starbox orbit
| reference = <ref name=msc/>
| primary = β Cen A
| name = β Cen B
| period = 288.267
| period_unitless =
| axis = 0.870
| axis_unitless =
| eccentricity =
| inclination =
| node =
| periastron =
| periarg =
| periarg_primary =
| k1 =
| k2 =
}}
{{Starbox detail
| component1  = β Cen Aa
| radius      = {{solar radius calculator|type=AD|0.77|0.1106|decimals=2}}{{efn|name=radius|group=note}}
| mass        = {{val|12.02|0.13}}<ref name=Pigulski16/>
| luminosity  = {{val|31,600|18,500|11,700|fmt=commas}}<ref name=schultz2019/>
| temperature = {{val|25,000|2,000|fmt=commas}}<ref name=schultz2019/>
| gravity = {{val|3.55|0.11}}<ref name=schultz2019/>
| rotational_velocity = {{val|190|20}}<ref name=alecian2011/>
| age_myr = {{val|14.1|0.6}}<ref name=aaa455_1_259/>
| component2  = β Cen Ab
| radius2      = {{solar radius calculator|type=AD|0.72|0.1106|decimals=2}}{{efn|name=radius|group=note}}
| mass2        = {{val|10.58|0.18}}<ref name=Pigulski16/>
| luminosity2  = {{val|25,100|14,700|9,300|fmt=commas}}<ref name=schultz2019/>
| temperature2 = {{val|23,000|2,000|fmt=commas}}<ref name=schultz2019/>
| gravity2 = {{val|3.55|0.11}}<ref name=schultz2019/>
| rotational_velocity2 = {{val|75|15}}<ref name=alecian2011/>
| age_myr2 = {{val|14.1|0.6}}<ref name=aaa455_1_259/>
}}
{{Starbox detail|no_heading=y
| component1  = β Cen B
| radius      =
| mass        = 4.61<ref name=msc/>
| luminosity  =
| temperature =
| gravity =
| age_myr = {{val|14.1|0.6}}<ref name=aaa455_1_259/>
}}
{{Starbox catalog
| names = {{odlist | name=Agena | name2=Hadar<ref name=allen1963/> | HR=5267 | HD=122451 | CD=−59°5365 | LHS=51 | SAO=252582 | FK5=518 | HIP=68702 | GC=18971 | CCDM=J14038-6022 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad=HD+122451
}}
{{Starbox end}}

'''Beta Centauri''' is a triple [[star system]] in the southern [[constellation]] of [[Centaurus]]. It is officially called '''Hadar''' ({{IPAc-en|'|h|ei|d|ɑr}}). The [[Bayer designation]] of Beta Centauri is [[Latinisation of names|Latinised]] from '''β Centauri''', and abbreviated '''Beta Cen''' or '''β Cen'''. The system's combined [[apparent visual magnitude]] of 0.61 makes it the second-brightest object in Centaurus and the [[list of brightest stars|eleventh brightest star]] in the [[night sky]]. According to [[dynamical parallax]] measurements, the distance to this system is about {{Convert|361|ly|pc|abbr=off|lk=on|0}}.