View source for HD 180450

{{Short description|Star in the constellation Lyra}}
{{Starbox begin}}
{{Starbox observe
 | epoch       = J2000.0
 | constell    = [[Lyra (constellation)|Lyra]]
 | ra          = {{RA|19|15|24.85937}}<ref name=GaiaDR2/>
 | dec         = {{DEC|+30|31|34.9760}}<ref name=GaiaDR2/>
 | appmag_v    = 5.88<ref name=Anderson_Francis_2012/>
}}
{{Starbox character
 | type        = 
 | class       = M1IIIab<ref name=Anderson_Francis_2012/>
 | b-v         = {{val|+1.665|0.007}}<ref name=Anderson_Francis_2012/>
 | u-b         = +2.03
 | variable    = 
}}
{{Starbox astrometry
 | radial_v    = {{val|−64.43|0.23}}<ref name=GaiaDR2/>
 | prop_mo_ra  = 34.425<ref name=GaiaDR2/>
 | prop_mo_dec = −26.081<ref name=GaiaDR2/>
 | parallax    = 2.37
 | p_error     = 0.61
 | parallax_footnote = <ref name=GaiaDR2/>
 | absmag_v    = −2.03<ref name=Anderson_Francis_2012/>
}}
{{Starbox detail
 | mass        = 
 | radius      = {{val|68|12|13}}<ref name=GaiaDR2/>
 | gravity     = 
 | luminosity  = {{val|1002|34|fmt=commas}}<ref name=GaiaDR2/>
 | temperature = {{val|3947|433|305|fmt=commas}}<ref name=GaiaDR2/>
 | metal_fe    = 
 | rotation    = 
 | age_myr     = 
 | rotational_velocity = 
}}
{{Starbox catalog
 | names = {{odlist | HD=180450 | HR=7302 | BD=+30°3491 | SAO=68040 | HIP=94630 | GC=26550 | GSC=02653-01682 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad = HD+180450
}}
{{Starbox end}}

'''HD 180450''' is a single<ref name=Eggleton_Tokovinin_2008/> [[star]] in the northern [[constellation]] of [[Lyra (constellation)|Lyra]], positioned about half a degree to the [[North-northwest|NNW]] of the [[globular cluster]] [[Messier 56|M56]].<ref name=Sinnott_Perryman_1997/> At an [[apparent visual magnitude]] of 5.88,<ref name=Anderson_Francis_2012/> it is dimly visible to the naked eye under good viewing conditions. This star is located at a distance of approximately 1,400&nbsp;[[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]] measurements, but is drifting closer with a [[radial velocity]] of −64.4&nbsp;km/s.<ref name=GaiaDR2/>

This is an aging [[red giant]] star with a [[stellar classification]] of M1IIIab,<ref name=Anderson_Francis_2012/> It is currently on the [[asymptotic giant branch]],<ref name=Eggen1992/> having exhausted the supply of hydrogen in its [[stellar core|core]] and [[stellar evolution|evolved]] of the [[main sequence]]. It has expanded to ~68 times the radius of the Sun and is radiating a thousand times the Sun' luminosity from its enlarged [[photosphere]] at en [[effective temperature]]  of 3,947&nbsp;K.<ref name=GaiaDR2/>

==References==
{{reflist|refs=

<ref name=SIMBAD>{{cite simbad
 | title=HD 180450 | access-date=2021-10-14 }}</ref>

<ref name=GaiaDR2>{{Cite Gaia DR2|2039283324364949120}}</ref>

<ref name=Anderson_Francis_2012>{{citation
 | last1=Anderson | first1=E. | last2=Francis | first2=Ch.
 | title=XHIP: An extended hipparcos compilation
 | journal=Astronomy Letters | postscript=.
 | volume=38 | issue=5 | pages=331 | year=2012
 | bibcode=2012AstL...38..331A | arxiv=1108.4971
 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>

<ref name=Eggleton_Tokovinin_2008>{{citation | postscript=.
 | 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 | s2cid=14878976
 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 }}</ref>

<ref name=Eggen1992>{{citation
 | last1=Eggen | first1=Olin J.
 | title=Asymptotic giant branch stars near the sun
 | journal=Astronomical Journal | postscript=.
 | volume=104 | issue=1 | date=July 1992 | pages=275–313
 | doi=10.1086/116239 | bibcode=1992AJ....104..275E }}</ref>

<ref name=Sinnott_Perryman_1997>{{citation
 | first1=Roger W. | last1=Sinnott | postscript=.
 | first2=Michael A. C. | last2=Perryman
 | title=Millennium Star Atlas | page=1174
 | volume=3 | year=1997 | isbn=0-933346-84-0
 | publisher=Sky Publishing Corporation and the European Space Agency }}</ref>

}}

{{Stars of Lyra}}

[[Category:M-type giants]]
[[Category:Lyra]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|180450]]
[[Category:Hipparcos objects|094630]]
[[Category:Bright Star Catalogue objects|7302]]


{{giant-star-stub}}