astro.wikisort.org - Meteorite
HD 156668 b is an extrasolar planet orbiting the star HD 156668 78.5 light-years away in the constellation Hercules. It has a minimum mass of 3.1 Earth masses. At the time of discovery it was the second least massive planet discovered by the radial velocity method after Gliese 581 e, subject to the mass/inclination degeneracy that affects radial velocity measurements.[3] In addition to this, it has the lowest semi-amplitude, or the speed of the stellar wobble caused by planet's gravity tugging on the star determined by radial velocity, at 2.2 m/s.[3] This planet was discovered on January 6, 2010; it is the 8th planet discovered in 2010 after the first five planets detected by Kepler on January 4 and two planets around HD 9446 on January 5.
| Discovery | |
|---|---|
| Discovered by | Howard et al. |
| Discovery site | Keck Observatory |
| Discovery date | 2010-01-06 |
Detection method | Doppler Spectroscopy |
| Orbital characteristics | |
Semi-major axis | 0.04998 ± 0.00083 AU (7,477,000 ± 124,000 km)[1] |
| Eccentricity | 0.000[2] |
Orbital period (sidereal) | 4.6455 ± 0.0011[1] d |
Argument of periastron | 0[2] |
| Semi-amplitude | 1.89 ± 0.26 [1] |
| Star | HD 156668 |
References
- Andrew W. Howard; John Asher Johnson; Geoffrey W. Marcy; Debra A. Fischer; Jason T. Wright; Gregory W. Henry; Howard Isaacson; Jeff A. Valenti; Jay Anderson; Nikolai E. Piskunov (2010). "The NASA-UC Eta-Earth Program: II. A Planet Orbiting HD 156668 with a Minimum Mass of Four Earth Masses". The Astrophysical Journal. 726 (2): 73. arXiv:1003.3444v1. Bibcode:2011ApJ...726...73H. doi:10.1088/0004-637X/726/2/73. S2CID 15559379.
- Dawson, Rebekah I.; Fabrycky, Daniel C. (2010). "Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e". The Astrophysical Journal. 722 (1): 937–953. arXiv:1005.4050. Bibcode:2010ApJ...722..937D. doi:10.1088/0004-637X/722/1/937. S2CID 118592734.
- "Second Smallest Exoplanet Found To Date At Keck". W.M. Keck Observatory. 2010-01-07. Retrieved 2010-01-07.
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На других языках
- [en] HD 156668 b
[es] HD 156668 b
HD 156668 b es un planeta extrasolar que orbita la estrella HD 156668 a 78,5 años luz de distancia en la constelación de Hércules.[ru] HD 156668 b
HD 156668 b — экзопланета, которая обращается вокруг звезды HD 156668 на расстоянии 78,5 световых лет от Земли в созвездии Геркулеса.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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