HD 156668 b
|Exoplanet||List of exoplanets|
|Right ascension||(α)||17h 17m 40s|
|Declination||(δ)||+29° 13′ 38″|
|Distance||78.5 ± 2.0 ly
(24.1 ± 0.6 pc)
|Minimum mass||(m sin i)||3.1 ± 0.4 M⊕|
|Semi-major axis||(a)||0.04998 ± 0.00083 AU|
|Orbital period||(P)||4.6455 ± 0.0011 d|
|Time of conjunction||(Tc)||2454718.57 ± 0.11 JD|
|Semi-amplitude||(K)||1.89 ± 0.26  m/s|
|Discoverer(s)||Howard et al.|
|Discovery method||Doppler Spectroscopy|
|Discovery site||Keck Observatory|
|Open Exoplanet Catalogue||data|
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, subject to the mass/inclination degeneracy that affects radial velocity measurements. The only radial velocity planet less massive than this planet is Gliese 581 e, which was discovered on April 21, 2009, and has a minimum mass of 1.94 Earth masses. 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. 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.
- 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: . Bibcode:2010ApJ...722..937D. doi:10.1088/0004-637X/722/1/937.
- 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". arXiv: [astro-ph.EP].
- "Second Smallest Exoplanet Found To Date At Keck". W.M. Keck Observatory. 2010-01-07. Retrieved 2010-01-07.
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