View source for Astronomy:Rho Andromedae

{{Short description|Star in the constellation Andromeda}}
{{Starbox begin}}
{{Starbox image
 | image = 
     <div style="position: relative">[[File:Andromeda IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings]]
     <div style="position: absolute; left: 56.2%; top: 47.2%;">[[File:Cercle rouge 100%.svg|12px]]</div>
     </div>
 | caption=Location of ρ Andromedae (circled)
}}
{{Starbox observe
 | epoch       = [[Astronomy:J2000.0|J2000.0]]
 | ra          = {{RA|00|21|07.26896}}<ref name=GaiaDR2/>
 | dec         = {{DEC|+37|58|06.9727}}<ref name=GaiaDR2/>
 | appmag_v    = +5.19<ref name=aj73_84/>
 | constell    = [[Astronomy:Andromeda (constellation)|Andromeda]]
}}
{{Starbox character
 | class       = F5IV-V<ref name=Gray_et_al_2001/>
 | b-v         = +0.424<ref name=aj73_84/>
 | u-b         = +0.039<ref name=aj73_84/>
 | variable    = 
}}
{{Starbox astrometry
 | radial_v    = {{val|+10.4|0.6}}<ref name=Gontcharov2006/>
 | prop_mo_ra  = +57.599<ref name=GaiaDR2/>
 | prop_mo_dec = –38.378<ref name=GaiaDR2/>
 | parallax    = 20.1874
 | p_error     = 0.1179
 | parallax_footnote=<ref name=GaiaDR2/>
 | absmag_v    = +1.73<ref name=aaa418_989/>
}}
{{Starbox detail
 | component1  = 
 | mass        = 
 | radius      = {{val|3.37|0.07|0.03}}<ref name=GaiaDR2/>
 | luminosity  = {{val|17.93|0.13}}<ref name=GaiaDR2/>
 | temperature = {{val|6471|25|66|fmt=commas}}<ref name=GaiaDR2/>
 | metal_fe    = –0.09<ref name=apj354/>
 | gravity     = 3.84<ref name=apj354/>
 | age_gyr     = 1.3<ref name=aaa418_989/>
 | rotational_velocity = 44<ref name=apj354/>
}}
{{Starbox catalog
 | names = {{odlist | B=ρ And | F=27&nbsp;Andromedae | BD=+37&nbsp;45 | FK5=1009 | HD=1671 | HIP=1686 | HR=82 | SAO=53828 | PPM=65222 }}<ref name=SIMBAD/>
}}
{{Starbox reference
|Simbad=rho+And
}}
{{Starbox end}}

'''Rho Andromedae''', [[Social:Romanization of Greek|Latinized]] from ρ Andromedae, is the [[Astronomy:Bayer designation|Bayer designation]] for a [[Astronomy:Star|star]] in the northern [[Astronomy:Constellation|constellation]] of [[Astronomy:Andromeda (constellation)|Andromeda]]. It has an [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] of +5.19,<ref name=aj73_84/> which, according to the Bortle Dark-Sky Scale, is bright enough to be seen with the naked eye from dark suburban skies. Based upon [[Astronomy:Parallax|parallax]] measurements, this star is at a distance of approximately {{Convert|162|ly|pc|abbr=off|lk=on}} from the [[Astronomy:Sun|Sun]].<ref name=GaiaDR2/> It is drifting further away with a [[Astronomy:Radial velocity|radial velocity]] of +10&nbsp;km/s.<ref name=Gontcharov2006/>

The [[Astronomy:Stellar classification|stellar classification]] of this star is F5IV-V,<ref name=Gray_et_al_2001/> showing mixed spectral features of a [[Astronomy:Main sequence|main sequence]] and subgiant stage. It is about 1.3<ref name=aaa418_989/> billion years old with 3.4<ref name=GaiaDR2/> times the girth of the Sun and is spinning with a projected rotational velocity of 44&nbsp;km/s.<ref name=apj354/> The [[Astronomy:Stellar atmosphere|outer envelope]] is radiating around 18 times the luminosity of the Sun from its [[Astronomy:Photosphere|photosphere]] at an [[Astronomy:Effective temperature|effective temperature]] of 6,471&nbsp;K,<ref name=GaiaDR2/> giving it the yellow-white hue of an F-type star.<ref name=csiro/> [[Astronomy:Astrophysical X-ray source|X-ray emissions]] were detected from this star during the [[Astronomy:EXOSAT|EXOSAT]] mission.<ref name=aaa174_1_187/>

==Naming==
In [[Astronomy:Chinese astronomy|Chinese]], {{lang|zh|天廄}} ({{lang|zh-Latn|Tiān Jiù}}), meaning ''[[Astronomy:Wall (Chinese constellation)|Celestial Stable]]'', refers to an asterism consisting of ρ Andromedae, [[Astronomy:Theta Andromedae|θ Andromedae]] and [[Astronomy:Sigma Andromedae|σ Andromedae]]. Consequently, the [[Astronomy:Chinese star names|Chinese name]] for ρ Andromedae itself is {{lang|zh|天廄二}} ({{lang|zh-Latn|Tiān Jiù èr}}, {{lang-en|the Second Star of Celestial Stable}}.)<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060518.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 18 日]</ref>

==References==
{{reflist|refs=

<ref name=GaiaDR2>{{Cite Gaia DR2|378821548641870336}}</ref>

<ref name=apj354>{{cite journal | last=Balachandran | first=Suchitra | title=Lithium depletion and rotation in main-sequence stars | journal=Astrophysical Journal, Part 1 | volume=354 | date=May 1, 1990 | pages=310–332  | doi=10.1086/168691 | bibcode=1990ApJ...354..310B }}</ref>

<ref name=aaa418_989>{{citation | title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs | display-authors=1 | last1=Nordström | first1=B. | last2=Mayor | first2=M. | last3=Andersen | first3=J. | last4=Holmberg | first4=J. | last5=Pont | first5=F. | last6=Jørgensen | first6=B. R. | last7=Olsen | first7=E. H. | last8=Udry | first8=S. | last9=Mowlavi | first9=N. | journal=Astronomy and Astrophysics | volume=418 | pages=989–1019  |date=May 2004 | doi=10.1051/0004-6361:20035959 | bibcode=2004A&A...418..989N | arxiv=astro-ph/0405198 | s2cid=11027621 | postscript=. }}</ref>

<ref name=aj73_84>{{citation | last1=Breger | first1=M. | title=UBV and narrow-band UVBY photometry of bright stars | journal=Astronomical Journal | volume=73 | pages=84–85 |date=March 1968 | doi=10.1086/110602 | bibcode=1968AJ.....73...84B | postscript=. }}</ref>

<ref name=SIMBAD>{{cite simbad | title=* rho And -- Star | access-date=2012-06-24 }}</ref>

<ref name=csiro>{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | access-date=2012-01-16 | postscript=. | archive-date=2013-12-03 | archive-url=https://web.archive.org/web/20131203222826/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | url-status=dead }}</ref>

<ref name=aaa174_1_187>{{citation | last1=Gondoin | first1=P. | last2=Mangeney | first2=A. | last3=Praderie | first3=F. | title=Solar-type giants - New X-ray detections from EXOSAT observations | journal=Astronomy and Astrophysics | volume=174 | issue=1–2 | pages=187–196 |date=March 1987 | bibcode=1987A&A...174..187G | postscript=. }}</ref>

<ref name=Gray_et_al_2001>{{citation
 | display-authors=1 | last1=Gray | first1=R. O.
 | last2=Napier | first2=M. G. | last3=Winkler | first3=L. I.
 | title=The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars
 | journal=The Astronomical Journal
 | volume=121 | issue=4 | pages=2148–2158 | date=April 2001
 | doi=10.1086/319956 | doi-access=free
 | bibcode=2001AJ....121.2148G | postscript=. }}</ref>

<ref name=Gontcharov2006>{{citation
 | last1=Gontcharov | first1=G. A.
 | title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system
 | journal=Astronomy Letters
 | volume=32| issue=11| pages=759–771| date=November 2006
 | doi=10.1134/S1063773706110065 | arxiv=1606.08053
 | bibcode=2006AstL...32..759G | s2cid=119231169
 | postscript=. }}</ref>

}}

==External links==
* [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+1671&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad HD 1671]
* [http://aladin.u-strasbg.fr/AladinPreview?-c=00+21+07.2691%2B37+58+06.971&ident=*+rho+And&submit=Aladin+previewer Image HD 1671]

{{Stars of Andromeda}}

{{DEFAULTSORT:Rho Andromedae}}
[[Category:F-type main-sequence stars]]
[[Category:F-type subgiants]]
[[Category:Andromeda (constellation)]]
[[Category:Bayer objects|Andromedae, Rho]]
[[Category:Durchmusterung objects|BD+37 0045]]
[[Category:Flamsteed objects|Andromedae, 27]]
[[Category:Henry Draper Catalogue objects|001671]]
[[Category:Hipparcos objects|001686]]
[[Category:Bright Star Catalogue objects|0082]]

{{Sourceattribution|Rho Andromedae}}