HD 156668 b is an exoplanet that revolves around the star HD 156668 at a distance of 78.5 light years from Earth in the constellation Hercules .
| HD 156668 b | |
|---|---|
| Exoplanet | |
| Parent star | |
| Star | HD 156668 |
| Constellation | Hercules |
| Right Ascension ( α ) | 17 h 17 m 40 s |
| Declination ( δ ) | + 29 ° 13 ′ 38 ″ |
| Visible magnitude ( m V ) | 8.42 |
| Distance | 78.5 ± 2.0 St. of the year (24.1 ± 0.6 pc ) |
| Spectral class | K2V |
| Elements of the orbit | |
| Semimajor axis ( a ) | 0.0500 ± 0.0007 [1] a. e. |
| Eccentricity ( e ) | 0 [1] |
| Orbital Period ( P ) | 4.6455 ± 0.0011 [1] d. |
| Connection time | 2454718.57 ± 0.11 [1] JD |
| Radial half-amplitude ( K ) star speed | 1.89 ± 0.26 [1] m / s |
| physical characteristics | |
| Minimum Weight ( m sin i ) | 4.15 ± 0.58 [1] M ⊕ |
| Radius ( r ) | ? R j |
| Discovery Information | |
| opening date | 2010-01-06 |
| Discoverer (s) | Howard et al. |
| Detection method | Doppler Method |
| Opening place | Kek Observatory |
| Opening status | confirmed |
The minimum mass of the planet is estimated at 4.15 Earth masses, the planet belongs to super-earths . The semimajor axis of the orbit is estimated at 0.05 a. e . At the time of discovery, the planet was the second most low-mass planet discovered using the Doppler method. [2] Smaller is only the planet Gliese 581 e , which was discovered on April 21, 2009 and having a mass of 1.94 terrestrial. The radial velocity of the star is only 1.89 m / s - the least known recorded result. [2] The planet was discovered on January 6, 2010, and became the eighth open exoplanet in 2010.
The mother star is a weak orange dwarf of spectral class K2V with a luminosity equal to 27% of the solar luminosity, the mass of the star is 38% of the solar, and the radius is 75%. [3] [4] [5] [6]
Notes
- ↑ 1 2 3 4 5 6 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", arΧiv : 1003.3444v1 [astro-ph.EP]
- ↑ 1 2 Second Smallest Exoplanet Found To Date At Keck (link not available) . WM Keck Observatory (January 7, 2010). Date of treatment January 7, 2010. Archived on April 22, 2012.
- ↑ K stars within 100 light-years . Sol Station . Date of treatment February 9, 2010. Archived April 22, 2012.
- ↑ Abstract . Harvard.edu . Date of treatment February 9, 2010. Archived April 10, 2012.
- ↑ Object and Aliases unopened (inaccessible link) . NASA / IPAC / NExSci Star & Exo Planet Observations . Date of treatment February 9, 2010. Archived April 22, 2012.
- ↑ Star: HD 156668 . exoplanets.eu . Date of treatment February 9, 2010. Archived April 22, 2012.
See also
- List of exoplanets discovered in 2010