User:Good afternoon/3.1415926
| 太陽系外行星 | 太陽系外行星列表 | |
|---|---|---|
| 母恆星 | ||
| 母恆星 | HD 217107 | |
| 星座 | 双鱼座 | |
| 距離 | 64.3 ± 1 ly (19.7 ± 0.3 pc) | |
| 光譜類型 | G8IV | |
| 軌道參數 | ||
| 半長軸 | (a) | 0.074 ± 0.002 AU |
| 軌道離心率 | (e) | 0.13 ± 0.02 |
| 公轉週期 | (P) | 7.1269 ± 0.00022 d |
| 角距 | (θ) | 1.973 mas |
| 近星點時間 | (T0) | 2,449,998.4241 ± 0.17 JD |
| 半振幅 | (K) | 140.7 ± 2.6 m/s |
| 物理性质 | ||
| 质量 | (m) | >1.37 ± 0.14 MJ |
| 發現 | ||
| 發現時間 | November 24, 1998 | |
| 發現者 | 傑佛瑞·馬西及其他 | |
| 發現方法 | 都卜勒光譜學 | |
| 發現地點 | 美國 | |
| 發表論文 | 確認 | |
HD 217107 b是一個離地球約64光年外的太陽系外行星[1]in the constellation of Pisces (the Fish). The planet was discovered orbiting the star HD 217107 approximately every seven days, classifying the planet as a hot Jupiter. Because of the planet's somewhat eccentric orbit, scientists were able to confirm another planet within the system (HD 217107 c).
Discovery[编辑]
As with the majority of extrasolar planet discoveries so far, it was found by detecting small variations in the radial velocity of the star it orbits, caused by the tug of its gravity. A study of the radial velocity of HD 217107 carried out in 1998 revealed that its motion along the line of sight varied over a 7.1 day cycle. The period and amplitude of this variation indicated that it was caused by a planetary companion in orbit around the star, with a minimum mass slightly greater than that of Jupiter.[2] The planet's mean distance from the star is less than one fifth of Mercury's distance from the Sun.
第二顆行星的徵象[编辑]
While most planets with orbital periods of less than 10 days have almost circular orbits, HD 217107 b has a somewhat eccentric orbit, and its discoverers hypothesized that this could be due to the gravitational influence of a second planet in the system at a distance of several astronomical units (AU).[3] Confirmation of the existence of a second planet, HD 217107 c, followed in 2005.
參見[编辑]
參考[编辑]
- ^ Vogt, Steven S.; et al. Five New Multicomponent Planetary Systems. The Astrophysical Journal. 2005, 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901.
- ^ Fischer; et al. Planetary Companions around Two Solar-Type Stars: HD 195019 and HD 217107. Publications of the Astronomical Society of the Pacific. 1999, 111 (755): 50–56. Bibcode:1999PASP..111...50F. arXiv:astro-ph/9810420
. doi:10.1086/316304.
- ^ Fischer; et al. Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets. The Astrophysical Journal. 2002, 551 (2): 1107–1118. Bibcode:2001ApJ...551.1107F. doi:10.1086/320224.
外部鏈接[编辑]
- HD 217107 / HR 8734. SolStation. [2008-06-23].
- Notes for planet HD 217107 b. The Extrasolar Planets Encyclopaedia. [2008-06-23].
| ||||||||||||
