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HD 212771
獅子山（Lionrock）
觀測資料; 曆元 J2000.0 (ICRS)
星座	寶瓶座
星官
赤經	22h 27m 03.072s
赤緯	-17° 15′ 49.164″
視星等（V）	7.6+0.01; −
特性
光谱分类	G8 IV
U−B 色指数	+0.54
B−V 色指数	+0.88
天体测定
徑向速度 (Rv)	14.9+0.03; − km/s
自行 (μ)	赤经：−85.892 mas/yr ; 赤纬：−104.042 mas/yr
视差 (π)	8.9648 ± 0.0314 mas
距离	364 ± 1 ly ; (111.5 ± 0.4 pc)
绝对星等 (MV)	2.04
詳細資料
質量	1.56 M☉
半徑	5.27 R☉
表面重力 (log g)	3.31
亮度	11.55±0.08 L☉
溫度	5,003 K
金属量 [Fe/H]	−0.09±0.01 dex
年齡	1.676±0.287 Gyr
其他命名
	BD−17°6526、HD 212771、HIP 110813、SAO 165086
參考資料庫
SIMBAD	资料
系外行星資料庫（英语：Exoplanet Archive）	资料
系外行星百科	资料

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^[2]，使它不能以肉眼直接看到，但很容易用雙筒望遠鏡看到。視差量測得到的距離是在364光年^[1]，並且現時以7004150000000000000♠15 km/s徑向速度遠離太陽系^[5]。

HD 212771的恆星分類為G8 IV^[3]，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^[9]。它的質量是1.56太陽質量，半徑是太陽的5倍^[7]。它的輻射量是7001110000000000000♠11 太陽光度^[8]，在5,003K的有效溫度下略微增大的光球 ^[7]，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，自轉的投影旋轉速度約為7003200000000000000♠2 km/s.^[9]。

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^[10]。

HD 212771被命名為獅子山。該名稱是在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。它以獅子山命名之後，它的行星 HD 212771b被命名為「太平山」^[11]^[12]。

HD 212771的行星系^[7]
成員 (依恆星距離)	质量	半長軸 (AU)	轨道周期 (天)	離心率	傾角	半径
b /太平山（Victoriapeak）	≥2.39+0.27 − M_J	1.19+0.13 −	381+1 −	0.076+0.051 −	—	—

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^2.0 ^2.1 ^2.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics. March 2000, 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
^ ^3.0 ^3.1 Houk, N.; Smith-Moore, M. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0. 4. 1988. Bibcode:1988mcts.book.....H.
^ Paunzen, E. Catalogue of stars measured in the Geneva seven-colour photometric system. Astronomy & Astrophysics. May 2022, 661: A89. Bibcode:2022A&A...661A..89P. ISSN 0004-6361. arXiv:2111.04810 . doi:10.1051/0004-6361/202142355 . eISSN 1432-0746.
^ ^5.0 ^5.1 Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. Stellar parameters and chemical abundances of 223 evolved stars with and without planets. Astronomy & Astrophysics. 26 January 2015, 574: A50. Bibcode:2015A&A...574A..50J. ISSN 0004-6361. arXiv:1410.6422 . doi:10.1051/0004-6361/201424474 . eISSN 1432-0746.
^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. May 2012, 38 (5): 331–346. Bibcode:2012AstL...38..331A. ISSN 1063-7737. S2CID 255204555. arXiv:1108.4971 . doi:10.1134/S1063773712050015 （英语）.
^ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 ^7.6 Luhn, Jacob K.; Bastien, Fabienne A.; Wright, Jason T.; Johnson, John A.; Howard, Andrew W.; Isaacson, Howard. Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts. The Astronomical Journal. 20 March 2019, 157 (4): 149. Bibcode:2019AJ....157..149L. arXiv:1811.03043 . doi:10.3847/1538-3881/aaf5d0 . eISSN 1538-3881.
^ ^8.0 ^8.1 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
^ ^9.0 ^9.1 ^9.2 ^9.3 Ghezzi, L., Retired A Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass, The Astrophysical Journal, June 2018, 860 (2): 18, Bibcode:2018ApJ...860..109G, S2CID 118969017, arXiv:1804.09082 , doi:10.3847/1538-4357/aac37c 
^ Johnson, John Asher; Howard, Andrew W.; Bowler, Brendan P.; Henry, Gregory W.; Marcy, Geoffrey W.; Wright, Jason T.; Fischer, Debra A.; Isaacson, Howard. Retired A Stars and Their Companions. IV. Seven Jovian Exoplanets from Keck Observatory1. Publications of the Astronomical Society of the Pacific. June 2010, 122 (892): 701–711. Bibcode:2010PASP..122..701J. ISSN 0004-6280. arXiv:1003.3445 . doi:10.1086/653809 . eISSN 1538-3873.
^ Approved names. NameExoworlds. [2020-01-02]. （原始内容存档于2019-12-19）（英语）.
^ International Astronomical Union | IAU. www.iau.org. [2020-01-02]. （原始内容存档于2020-04-08）.

[EDR3-1] 1.0 ^1.1 ^1.2 ^1.3 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[Tycho2000-2] 2.0 ^2.1 ^2.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics. March 2000, 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[Houk1988-3] 3.0 ^3.1 Houk, N.; Smith-Moore, M. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0. 4. 1988. Bibcode:1988mcts.book.....H.

[Paunzen2022-4] Paunzen, E. Catalogue of stars measured in the Geneva seven-colour photometric system. Astronomy & Astrophysics. May 2022, 661: A89. Bibcode:2022A&A...661A..89P. ISSN 0004-6361. arXiv:2111.04810 . doi:10.1051/0004-6361/202142355 . eISSN 1432-0746.

[Jofré2015-5] 5.0 ^5.1 Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. Stellar parameters and chemical abundances of 223 evolved stars with and without planets. Astronomy & Astrophysics. 26 January 2015, 574: A50. Bibcode:2015A&A...574A..50J. ISSN 0004-6361. arXiv:1410.6422 . doi:10.1051/0004-6361/201424474 . eISSN 1432-0746.

[Anderson2012-6] Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. May 2012, 38 (5): 331–346. Bibcode:2012AstL...38..331A. ISSN 1063-7737. S2CID 255204555. arXiv:1108.4971 . doi:10.1134/S1063773712050015 （英语）.

[Luhn2019-7] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 ^7.6 Luhn, Jacob K.; Bastien, Fabienne A.; Wright, Jason T.; Johnson, John A.; Howard, Andrew W.; Isaacson, Howard. Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts. The Astronomical Journal. 20 March 2019, 157 (4): 149. Bibcode:2019AJ....157..149L. arXiv:1811.03043 . doi:10.3847/1538-3881/aaf5d0 . eISSN 1538-3881.

[GaiaDR2-8] 8.0 ^8.1 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录

[Rhazzi2018-9] 9.0 ^9.1 ^9.2 ^9.3 Ghezzi, L., Retired A Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass, The Astrophysical Journal, June 2018, 860 (2): 18, Bibcode:2018ApJ...860..109G, S2CID 118969017, arXiv:1804.09082 , doi:10.3847/1538-4357/aac37c 

[Johnson2010-10] Johnson, John Asher; Howard, Andrew W.; Bowler, Brendan P.; Henry, Gregory W.; Marcy, Geoffrey W.; Wright, Jason T.; Fischer, Debra A.; Isaacson, Howard. Retired A Stars and Their Companions. IV. Seven Jovian Exoplanets from Keck Observatory1. Publications of the Astronomical Society of the Pacific. June 2010, 122 (892): 701–711. Bibcode:2010PASP..122..701J. ISSN 0004-6280. arXiv:1003.3445 . doi:10.1086/653809 . eISSN 1538-3873.

[11] Approved names. NameExoworlds. [2020-01-02]. （原始内容存档于2019-12-19）（英语）.

[12] International Astronomical Union | IAU. www.iau.org. [2020-01-02]. （原始内容存档于2020-04-08）.

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