HD 217107

**HD 217107**
觀測資料; 曆元 J2000.0
星座	雙魚座
星官
赤經	22時 58分 15.5412秒
赤緯	–2° 23′ 43.3871″
視星等（V）	+6.17
特性
光譜分類	G8 IV-V
B−V 色指數	0.744±0.006
天體測定
徑向速度 (Rv)	−13.4±0.1 km/s
自行 (μ)	赤經：−7.108±0.125 mas/yr ; 赤緯：−14.777±0.071 mas/yr
視差 (π)	49.8170 ± 0.0574 mas
距離	65.47 ± 0.08 ly ; (20.07 ± 0.02 pc)
絕對星等 (MV)	4.68
Details
質量	0.969 M☉
半徑	1.2104±0.0195 R☉
光度	1.0951±0.0338 L☉
溫度	5391±40 K
金屬量	0.31
年齡	11.9 Gyr
其他命名
	6 G. Piscium、BD−03° 5539、FK5 3836、HD 217107、HIP 113421、HR 8734、SAO 146412、CCDM J22583-0224AB
參考資料庫
SIMBAD	data ;

HD 217107（又叫6 G. Piscium）係雙魚座入面一粒黃次巨星，距離地球大約65光年。佢嘅質量同太陽相近，但係就老過太陽好多。目前已經發現兩粒行星圍住佢轉，一粒好近，公轉週期係七日，另一粒好遠，公轉週期超過十四年。

恆星資料

HD 217107同太陽好近，蓋亞衛星度到佢嘅視差係49.8170毫角秒，換算即係同太陽嘅距離係65.47光年。佢嘅視星等係6.17，喺適合觀星嘅日子用肉眼勉強可以睇到。

光譜學嚟講佢屬於G7或者G8類，即係佢嘅溫度大約係5,000K。佢嘅質量同太陽相近，但係估算年齡係77億年，比起太陽46億年係老好多。現時認為佢核聚變已經幾乎消耗哂核心入邊嘅氫，演化緊並開始離開主序帶。^[5]

行星系統

1998年，對HD 217107嘅徑向速度研究顯示佢嘅徑向運動有一個7.1日嘅週期，呢個變化嘅週期同大細顯示係由一粒圍住佢轉嘅行星造成嘅，而且粒行星起碼都有木星咁重。^[5]呢粒行星被命名為HD 217107 b。

大部份公轉週期短過10日嘅行星佢嘅軌道都係好圓嘅，但係HD 217107 b嘅軌道就較為橢圓，發現呢點嘅人猜想系統入面有另一粒行星，喺幾個天文單位嘅距離以引力影響呢條軌道。^[6]2005年終於確認咗係有第二粒行星，長年觀察恆星嘅徑向速度揭示佢有一個週期最少係八年嘅變化，係由第二粒行星造成嘅，呢粒行星起碼有兩粒木星咁重，軌道非常橢圓，半長軸大約4.3個天文單位咁長。^[7]呢粒行星被命名做HD 217107 c。^[8]

HD 217107 行星系統^[9]^[10]
行星由恆星近至遠	質量	半長軸 (AU)	公轉週期 (days)	離心率	傾角	半徑
b	7000139399999999999♠>1.394+0.057 −0.059 M_J	0.0746+0.0015−0.0016	7.126853±0.000012	0.1272±0.0028	—	—
c	7000409000000000000♠>4.09+0.23 −0.224 M_J	5.94±0.13	5059.34+52.78−49.02	0.3991±0.0103	—	—

參考資料

↑ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 Brown, A. G. A.; 等 (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
↑ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
↑ ^3.0 ^3.1 ^3.2 ^3.3 ^3.4 ^3.5 Boyajian, Tabetha S.; 等 (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, S2CID 14911430, 40. See Table 3.
↑ Template:Cite simbad
↑ ^5.0 ^5.1 Fischer, Debra A.; 等 (1999). "Planetary Companions around Two Solar-Type Stars: HD 195019 and HD 217107". Publications of the Astronomical Society of the Pacific. 111 (755): 50–56. arXiv:astro-ph/9810420. Bibcode:1999PASP..111...50F. doi:10.1086/316304. S2CID 17980987.
↑ Fischer, Debra A.; 等 (2002). "Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets". The Astrophysical Journal. 551 (2): 1107–1118. Bibcode:2001ApJ...551.1107F. doi:10.1086/320224.
↑ Vogt, Steven S.; 等 (2005). "Five New Multicomponent Planetary Systems" (PDF). The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901.
↑ Wright, J. T.; 等 (2009). "Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems". The Astrophysical Journal. 693 (2): 1084–1099. arXiv:0812.1582. Bibcode:2009ApJ...693.1084W. doi:10.1088/0004-637X/693/2/1084. S2CID 18169921.
↑ Feng, Y. Katherina; 等 (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800 (1). 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22. S2CID 56390823.
↑ Giovinazzi, Mark R.; Blake, Cullen H.; Eastman, Jason D.; Wright, Jason; McCrady, Nate; Wittenmyer, Rob; Johnson, John A.; Plavchan, Peter; Sliski, David H.; Wilson, Maurice L.; Johnson, Samson A.; Horner, Jonathan; Kane, Stephen R.; Houghton, Audrey; García‐Mejía, Juliana; Glaser, Joseph P. (2020), "The HD 217107 planetary system: Twenty years of radial velocity measurements", Astronomische Nachrichten, 341 (9): 870–878, arXiv:2009.12356, Bibcode:2020AN....341..870G, doi:10.1002/asna.202013830, S2CID 221949076

外部連結

Extrasolar Planet Interactions by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
"HD 217107 / HR 8734". SolStation. 喺2008-06-23搵到.
"Notes for star HD 217107". The Extrasolar Planets Encyclopaedia. 喺2008-06-23搵到.

座標： 22^h 58^m 15.54^s, −02° 23′ 43.39″

[Gaia_DR2-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 Brown, A. G. A.; 等 (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Anderson2012-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.

[apj771_1_40-3] 3.0 ^3.1 ^3.2 ^3.3 ^3.4 ^3.5 Boyajian, Tabetha S.; 等 (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, S2CID 14911430, 40. See Table 3.

[SIMBAD-4] Template:Cite simbad

[Fischer1999-5] 5.0 ^5.1 Fischer, Debra A.; 等 (1999). "Planetary Companions around Two Solar-Type Stars: HD 195019 and HD 217107". Publications of the Astronomical Society of the Pacific. 111 (755): 50–56. arXiv:astro-ph/9810420. Bibcode:1999PASP..111...50F. doi:10.1086/316304. S2CID 17980987.

[Fischer2002-6] Fischer, Debra A.; 等 (2002). "Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets". The Astrophysical Journal. 551 (2): 1107–1118. Bibcode:2001ApJ...551.1107F. doi:10.1086/320224.

[Vogt2005-7] Vogt, Steven S.; 等 (2005). "Five New Multicomponent Planetary Systems" (PDF). The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901.

[Wright2009-8] Wright, J. T.; 等 (2009). "Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems". The Astrophysical Journal. 693 (2): 1084–1099. arXiv:0812.1582. Bibcode:2009ApJ...693.1084W. doi:10.1088/0004-637X/693/2/1084. S2CID 18169921.

[Feng2015-9] Feng, Y. Katherina; 等 (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800 (1). 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22. S2CID 56390823.

[10] Giovinazzi, Mark R.; Blake, Cullen H.; Eastman, Jason D.; Wright, Jason; McCrady, Nate; Wittenmyer, Rob; Johnson, John A.; Plavchan, Peter; Sliski, David H.; Wilson, Maurice L.; Johnson, Samson A.; Horner, Jonathan; Kane, Stephen R.; Houghton, Audrey; García‐Mejía, Juliana; Glaser, Joseph P. (2020), "The HD 217107 planetary system: Twenty years of radial velocity measurements", Astronomische Nachrichten, 341 (9): 870–878, arXiv:2009.12356, Bibcode:2020AN....341..870G, doi:10.1002/asna.202013830, S2CID 221949076

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

觀測資料曆元 J2000.0
星座	雙魚座
星官
赤經	22^時 58^分 15.5412^秒^[1]
赤緯	–2° 23′ 43.3871″^[1]
視星等（V）	+6.17^[2]
特性
光譜分類	G8 IV-V^[2]
B−V 色指數	6999744000000000000♠0.744±0.006^[2]
天體測定

徑向速度 (R_v)	2998866000000000000♠−13.4±0.1^[2] km/s
自行 (μ)	赤經：2999289200000000000♠−7.108±0.125^[1] mas/yr 赤緯：2998852230000000000♠−14.777±0.071^[1] mas/yr
視差 (π)	49.8170 ± 0.0574^[1] mas
距離	65.47 ± 0.08 ly (20.07 ± 0.02 pc)
絕對星等 (M_V)	4.68^[2]

Details

質量	0.969^[3] `M`_☉
半徑	7000121039999999999♠1.2104±0.0195^[3] `R`_☉
光度	7000109510000000000♠1.0951±0.0338^[3] `L`_☉
溫度	7003539100000000000♠5391±40^[3] K
金屬量	0.31^[3]
年齡	11.9^[3] Gyr

其他命名
6 G. Piscium、BD−03° 5539、FK5 3836、HD 217107、HIP 113421、HR 8734、SAO 146412、CCDM J22583-0224AB^[4]
參考資料庫
SIMBAD	data