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{{Starbox begin
| name = [[HD星表|HD]] 212771<br/>獅子山（Lionrock）
}}
{{Starbox observe
| epoch = [[J2000.0]] ([[國際天球參考系|ICRS]])
| constell = [[寶瓶座]]
| ra = {{RA|22|27|03.072}}<ref name= EDR3/>
|dec = {{DEC|-17|15|49.164}}<ref name = EDR3/>
| appmag_v = 7.6{{±|0.01}}<ref name = Tycho2000/>
}}
{{Starbox character
| class = G8 IV<ref name = Houk1988/>
| u-b = +0.54<ref name = Paunzen2022/>
| b-v = +0.88<ref name = Tycho2000/>
}}
{{Starbox astrometry
| radial_v = 14.9{{±|0.03}}<ref name = Jofré2015/>
| parallax = 8.9648
| p_error = 0.0314
| parallax_footnote = <ref name = EDR3/>
| prop_mo_ra = −85.892
| prop_mo_dec = −104.042
| pm_footnote = <ref name = EDR3/>
| absmag_v = 2.04<ref name = Anderson2012/>
}}
{{Starbox detail
| radius = 5.27<ref name = Luhn2019/>
| luminosity = {{val|11.55|0.08}}<ref name=GaiaDR2/>
| temperature = 5,003<ref name = Luhn2019/>
| mass = 1.56<ref name = Luhn2019/>
| metal_fe = {{val|-0.09|0.01}}<ref name = Rhazzi2018/>
| age_gyr = {{val|1.676|0.287}}<ref name = Rhazzi2018/>
| gravity = 3.31<ref name = Luhn2019/>
| rotation_velocity = {{val|1.7|0.6}}<ref name = Rhazzi2018/>
}}
{{Starbox catalog
| names = {{odlist|BD = -17°6526|HD = 212771|HIP = 110813|Lionrock|SAO = 165086}}
}}
{{Starbox reference
| Simbad = HD+212771
| EPE = HD+212771
| NSTED = HD+212771
}}
{{Starbox end}}

'''HD 212771'''，已稱為'''獅子山'''，是位於黃道南側[[星座]][[寶瓶座]]中的一顆孤獨恆星。它的[[視星等]]為7.60<ref name = Tycho2000/>，使它不能以[[肉眼]]直接看到，但很容易用雙筒望遠鏡看到。[[恆星視差|視差]]量測得到的距離是在364[[光年]]<ref name = EDR3/>，並且現時以{{val|15|ul=km/s}}[[徑向速度]]遠離[[太陽系]]<ref name = Jofré2015/>。

HD 212771的[[恆星分類]]為G8 IV<ref name = Houk1988/>，表明它已經由一顆[[F-型主序星]]演化成[[次巨星]]，估計在17億年後將朝向[[紅巨星分支]]演化<ref name = Rhazzi2018/>。它的質量是1.56[[太陽質量]]，半徑是太陽的5倍<ref name = Luhn2019/>。它的輻射量是{{val|11|ul=太陽光度}}<ref name=GaiaDR2/>，在5,003[[Kelvin|K]]的[[有效溫度]]下略微增大的[[光球]] <ref name = Luhn2019/>，使其呈現黃色。不同於大多數行星的宿主，HD 212771略微缺乏金屬，自轉的[[恆星自轉#測量|投影旋轉速度]]約為{{val|2|ul=km/s}}.<ref name = Rhazzi2018/>。

== 行星系統 ==
2010年，[[凱克天文台]]的一組天文學家通過[[都卜勒光譜學|都卜勒光譜]]調查了幾顆[[次巨星]]的[[系外行星]]。他們碰巧發現了一顆圍繞HD 212771運行的大質量[[類木行星|類木]]行星<ref name = Johnson2010/>。

HD 212771被命名為'''獅子山'''。該名稱是在[[國際天文學聯合會|IAU]]成立100周年的[[IAU100太陽系外世界命名活動]]由[[香港]]地區的活動中選出。它以[[獅子山 (香港)|獅子山]]命名之後，它的行星 HD 212771b被命名為「[[HD 212771 b|太平山]]」<ref>{{Cite web|url=http://www.nameexoworlds.iau.org/final-results|title=Approved names|website=NameExoworlds|language=en|access-date=2020-01-02|archive-date=2019-12-19|archive-url=https://web.archive.org/web/20191219084750/http://www.nameexoworlds.iau.org/final-results|dead-url=no}}</ref><ref>{{Cite web|url=https://www.iau.org/news/pressreleases/detail/iau1912/|title=International Astronomical Union {{!}} IAU|website=www.iau.org|access-date=2020-01-02|archive-date=2020-04-08|archive-url=https://web.archive.org/web/20200408020100/https://www.iau.org/news/pressreleases/detail/iau1912/|dead-url=no}}</ref>。

{{Orbitbox planet begin
| table_ref = <ref name = Luhn2019/>
}}
{{Orbitbox planet
| exoplanet = [[HD 212771 b|b /太平山（Victoriapeak）]]
| mass = ≥2.39{{±|0.27}}
| period = 381{{±|1}}
| semimajor = 1.19{{±|0.13}}
| eccentricity = 0.076{{±|0.051}}
}}
{{Orbitbox end}}

== 參考資料 ==
{{reflist||refs=

<ref name = EDR3>{{Cite Gaia EDR3|2595360574179855104}}</ref>

<ref name=GaiaDR2>{{Cite DR2|2595360569884153728}}</ref>

<ref name = Houk1988>{{cite book |last1=Houk |first1=N. |last2=Smith-Moore |first2=M. |title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0. |date=1988 |volume=4 |bibcode=1988mcts.book.....H}}</ref>

<ref name = Rhazzi2018>{{Citation
|title = Retired A Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass
|last1 = Ghezzi |first1 = L.
|journal = The Astrophysical Journal |volume = 860 |issue = 2 |pages = 18 |date = June 2018
|bibcode = 2018ApJ...860..109G |doi = 10.3847/1538-4357/aac37c |arxiv = 1804.09082
|s2cid = 118969017 |doi-access = free }}</ref>

<ref name = Jofré2015>{{cite journal | last1 = Jofré | first1 = E. | last2 = Petrucci | first2 = R. | last3 = Saffe | first3 = C. | last4 = Saker | first4 = L. | last5 = Artur de la Villarmois | first5 = E. | last6 = Chavero | first6 = C. | last7 = Gómez | first7 = M. | last8 = Mauas | first8 = P. J. D. | title = Stellar parameters and chemical abundances of 223 evolved stars with and without planets | journal = Astronomy & Astrophysics | date = 26 January 2015 | volume = 574 | page = A50 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/201424474 | arxiv = 1410.6422 | bibcode = 2015A&A...574A..50J | doi-access = free}}</ref>

<ref name = Anderson2012>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |language=en |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971|s2cid=255204555 }}</ref>

<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}</ref>

<ref name = Paunzen2022>{{cite journal | last1 = Paunzen | first1 = E. | title = Catalogue of stars measured in the Geneva seven-colour photometric system | journal = Astronomy & Astrophysics | date = May 2022 | volume = 661 | page = A89 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/202142355 | pmid = | bibcode = 2022A&A...661A..89P | doi-access = free | arxiv = 2111.04810 }}</ref>

<ref name = Luhn2019>{{cite journal | last1 = Luhn | first1 = Jacob K. | last2 = Bastien | first2 = Fabienne A. | last3 = Wright | first3 = Jason T. | last4 = Johnson | first4 = John A. | last5 = Howard | first5 = Andrew W. | last6 = Isaacson | first6 = Howard | title = Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts | journal = The Astronomical Journal | date = 20 March 2019 | volume = 157 | issue = 4 | page = 149 | eissn = 1538-3881 | doi = 10.3847/1538-3881/aaf5d0 | bibcode = 2019AJ....157..149L | arxiv = 1811.03043 | doi-access = free }}</ref>

<ref name = Johnson2010>{{cite journal | last1 = Johnson | first1 = John Asher | last2 = Howard | first2 = Andrew W. | last3 = Bowler | first3 = Brendan P. | last4 = Henry | first4 = Gregory W. | last5 = Marcy | first5 = Geoffrey W. | last6 = Wright | first6 = Jason T. | last7 = Fischer | first7 = Debra A. | last8 = Isaacson | first8 = Howard | title = Retired A Stars and Their Companions. IV. Seven Jovian Exoplanets from Keck Observatory1 | journal = Publications of the Astronomical Society of the Pacific | date = June 2010 | volume = 122 | issue = 892 | pages = 701–711 | issn = 0004-6280 | eissn = 1538-3873 | doi = 10.1086/653809 | bibcode = 2010PASP..122..701J | arxiv = 1003.3445 | doi-access = free }}</ref>

}}
{{寶瓶座}}

{{DEFAULTSORT:HD 212771}}
[[Category:G型次巨星]]
[[Category:HIP天體|110813]]
[[Category:寶瓶座]]
[[Category:HD和HDE天體|212771]]
[[Category:BD、CD和CP天體]]
[[Category:具有一顆已確認行星的行星系統]]

HD 212771 - 版本历史

45.64.242.14：​刪除累贅內容

45.64.242.14：刪除累贅內容