牛宿增十

**HD 192310**
	牛宿增十在摩羯座的位置。
觀測資料; 曆元 J2000.0
星座	摩羯座
星官	牛宿牛
赤經	20h 15m 17.4s
赤緯	-27° 1′ 58″
視星等（V）	5.73
特性
光谱分类	K2+ V
U−B 色指数	0.64
B−V 色指数	0.88
变星类型	疑似變星
天体测定
徑向速度 (Rv)	-54.2 km/s
自行 (μ)	赤经：1241.85 mas/yr ; 赤纬：-180.96 mas/yr
视差 (π)	113.487 ± 0.30 mas
距离	28.74 ± 0.08 ly ; (8.81 ± 0.02 pc)
绝对星等 (MV)	6.0
詳細資料
質量	0.78 ± 0.04 M☉
半徑	0.79–0.85 R☉
表面重力 (log g)	4.38 ± 0.19
亮度	0.385 ± 0.007 L☉
溫度	5069 ± 49 K
金属量 [Fe/H]	-0.01 ± 0.05 dex
自轉	47.7 ± 4.9 days
自轉速度 (v sin i)	<3 km/s
年齡	7.5–8.9 Gyr
其他命名
	5 G. Capricorni，Gl 785，CD -27°14659，LHS 488，LTT 8009，GCTP 4804.00，FK5 ，NSV 12933，HIP 99825. CD-2714659，SAO 189065，HD 192310，HR 7722
參考資料庫
SIMBAD	资料
ARICNS	资料

牛宿增十，即HD 192310、摩羯座5 G.（5 G. Capricorni）、葛利斯785（Gliese 785），又名CD-2714659、SAO 189065、HR 7722，是一颗位於摩羯座的恒星^[1]^[2]，视星等为5.73，位于銀經15.62，銀緯-29.38，其B1900.0坐标为赤經20^h 9^m 3.1^s，赤緯-27° -29.38′ 53″。該恆星距離地球29光年，肉眼可見。雖然它被認為是變星，但尚未確認。

物理性質

牛宿增十的質量大約是太陽的78%^[8]，光度基於不同的測定方式，在太陽的79%到85%之間^[9]。該恆星較太陽年老，大約是75到89億年^[7]，金屬量大約與太陽相當^[10]。

牛宿增十的空間速度分量是（U, V, W）= (–69, –13, –14) km/s。而它環繞銀河系中心軌道的離心率是0.18，和銀河系中心的距離是8.1 kpc^[12]。

行星系

該恆星於2010年發現一顆質量相當於海王星的行星HD 192310 b^[13]，第二顆行星HD 192310 c則是於2011年使用高精度徑向速度行星搜索器的 GTO 程式和HD 85512 b以及天园增三的行星一起發現。第二顆行星因為缺乏它的完整軌道資料，其質量不確定性遠高於第一顆。這兩顆行星的組成可能和海王星類似，並且分別位於母恆星的適居帶內側和外側邊緣以外^[11]^[14]。

牛宿增十的行星系
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	≥16.9 ± 0.9 M_⊕	0.32 ± 0.005	74.72	0.13 ± 0.04	—	—
c	≥24 ± 5 M_⊕	1.18 ± 0.025	525.8 ± 9.2	0.32 ± 0.11	—	—

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 Pulsating variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2012-07-13]. （原始内容存档于2020-02-07）.
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 VizieR Detailed Page. [2012-07-13]. （原始内容存档于2016-03-05）.
^ ^3.0 ^3.1 ^3.2 ^3.3 ^3.4 ^3.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357
^ Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637
^ ^5.0 ^5.1 Johnson, H. L.; et al. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory. 1966, 4 (99): 99. Bibcode:1966CoLPL...4...99J.
^ Nordström, B.; et al, The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs, Astronomy and Astrophysics, May 2004, 418: 989–1019, Bibcode:2004A&A...418..989N, arXiv:astro-ph/0405198 , doi:10.1051/0004-6361:20035959
^ ^7.0 ^7.1 ^7.2 Mamajek, Eric E.; Hillenbrand, Lynne A., Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics, The Astrophysical Journal, November 2008, 687 (2): 1264–1293, Bibcode:2008ApJ...687.1264M, arXiv:0807.1686 , doi:10.1086/591785
^ ^8.0 ^8.1 Santos, N. C.; Israelian, G.; Mayor, M., The metal-rich nature of stars with planets, Astronomy and Astrophysics, July 2001, 373 (3): 1019–1031, Bibcode:2001A&A...373.1019S, arXiv:astro-ph/0105216 , doi:10.1051/0004-6361:20010648
^ ^9.0 ^9.1 Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics, Astronomy and Astrophysics, February 2001, 367: 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451
^ ^10.0 ^10.1 ^10.2 ^10.3 Ecuvillon, A.; et al, Nitrogen abundances in planet-harbouring stars, Astronomy and Astrophysics, May 2004, 418 (2): 703–715, Bibcode:2004A&A...418..703E, arXiv:astro-ph/0401396 , doi:10.1051/0004-6361:20035717
^ ^11.0 ^11.1 ^11.2 ^11.3 Pepe, F.; et al, The HARPS search for Earth-like planets in the habitable zone: I – Very low-mass planets around HD20794, HD85512 and HD192310, VizieR On-line Data Catalog: J/A+A/534/A58, 2011, Bibcode:2011yCat..35349058P, arXiv:1108.3447 , doi:10.1051/0004-6361/201117055
^ Porto de Mello, Gustavo; del Peloso, Eduardo F., Astrobiologically Interesting Stars Within 10 Parsecs of the Sun, Astrobiology, April 2006, 6 (2): 308–331, Bibcode:2006AsBio...6..308P, PMID 16689649, arXiv:astro-ph/0511180 , doi:10.1089/ast.2006.6.308
^ Schneider, Jean, Gl 785, Extrasolar Planets Encyclopaedia, [2011-10-29], （原始内容存档于2011-11-18）
^ Schneider, Jean, HD 192310 c, Extrasolar Planets Encyclopaedia, [2011-10-29], （原始内容存档于2011-11-08）

外部連結

CD-27 14659 / HR 7722. SolStation. [2007-05-11]. （原始内容存档于2012-04-03）.

[SIMBAD-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 Pulsating variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2012-07-13]. （原始内容存档于2020-02-07）.

[DATA-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 VizieR Detailed Page. [2012-07-13]. （原始内容存档于2016-03-05）.

[aaa474_2_653-3] 3.0 ^3.1 ^3.2 ^3.3 ^3.4 ^3.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357

[aj132_1_161-4] Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637

[clpl4_99_99-5] 5.0 ^5.1 Johnson, H. L.; et al. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory. 1966, 4 (99): 99. Bibcode:1966CoLPL...4...99J.

[aaa418_989-6] Nordström, B.; et al, The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs, Astronomy and Astrophysics, May 2004, 418: 989–1019, Bibcode:2004A&A...418..989N, arXiv:astro-ph/0405198 , doi:10.1051/0004-6361:20035959

[apj687_2_1264-7] 7.0 ^7.1 ^7.2 Mamajek, Eric E.; Hillenbrand, Lynne A., Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics, The Astrophysical Journal, November 2008, 687 (2): 1264–1293, Bibcode:2008ApJ...687.1264M, arXiv:0807.1686 , doi:10.1086/591785

[aaa373-8] 8.0 ^8.1 Santos, N. C.; Israelian, G.; Mayor, M., The metal-rich nature of stars with planets, Astronomy and Astrophysics, July 2001, 373 (3): 1019–1031, Bibcode:2001A&A...373.1019S, arXiv:astro-ph/0105216 , doi:10.1051/0004-6361:20010648

[aaa367_521-9] 9.0 ^9.1 Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics, Astronomy and Astrophysics, February 2001, 367: 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451

[aaa418-10] 10.0 ^10.1 ^10.2 ^10.3 Ecuvillon, A.; et al, Nitrogen abundances in planet-harbouring stars, Astronomy and Astrophysics, May 2004, 418 (2): 703–715, Bibcode:2004A&A...418..703E, arXiv:astro-ph/0401396 , doi:10.1051/0004-6361:20035717

[vizier534_A58-11] 11.0 ^11.1 ^11.2 ^11.3 Pepe, F.; et al, The HARPS search for Earth-like planets in the habitable zone: I – Very low-mass planets around HD20794, HD85512 and HD192310, VizieR On-line Data Catalog: J/A+A/534/A58, 2011, Bibcode:2011yCat..35349058P, arXiv:1108.3447 , doi:10.1051/0004-6361/201117055

[ab6_2-12] Porto de Mello, Gustavo; del Peloso, Eduardo F., Astrobiologically Interesting Stars Within 10 Parsecs of the Sun, Astrobiology, April 2006, 6 (2): 308–331, Bibcode:2006AsBio...6..308P, PMID 16689649, arXiv:astro-ph/0511180 , doi:10.1089/ast.2006.6.308

[epe_gl_785-13] Schneider, Jean, Gl 785, Extrasolar Planets Encyclopaedia, [2011-10-29], （原始内容存档于2011-11-18）

[epe_hd_192310_c-14] Schneider, Jean, HD 192310 c, Extrasolar Planets Encyclopaedia, [2011-10-29], （原始内容存档于2011-11-08）

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牛宿增十

物理性質

行星系

參考資料

外部連結

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