HD 187085 b is an exoplanet that revolves around the yellow dwarf HD 187085 of spectral class G 0V [1] at a distance of about 147 light years from the solar system in the constellation Sagittarius . The discovery was made as part of the AAPS program by Doppler spectroscopy on March 14, 2006.
| HD 187085 b | |
|---|---|
| Exoplanet | |
 Author's idea of exoplanet, revolving around his star | |
| Parent star | |
| Star | HD 187085 |
| Constellation | Sagittarius |
| Right Ascension ( α ) | 19 h 49 m 33.9667 s |
| Declination ( δ ) | –37 ° 46 ′ 49.981 ″ |
| Distance | 147 St. years (44.98 ± 1.3 [1] pc ) |
| Spectral class | G0 v |
| Elements of the orbit | |
| Semimajor axis ( a ) | 2.05 [1] a. e. (307 million km ) |
| Pericenter ( q ) | 1.09 [2] a. e. |
| Apocenter ( Q ) | 3.01 [2] a. e. |
| Eccentricity ( e ) | 0.47 [1] |
| Orbital Period ( P ) | 986 [1] [3] d. (2.70 l. ) |
| Orbital Speed ( υ ) | 22.7 km / s |
| Pericenter Argument ( ω ) | 94 [2] ° |
| Pericenter Time ( T 0 ) | 2,450,912 JD |
| Radial half-amplitude ( K ) star speed | 26 m / s |
| physical characteristics | |
| Weight ( m ) | > 0.75 [2] M J |
| Radius ( r ) | ? R j |
| Discovery Information | |
| opening date | March 14, 2006 |
| Discoverer (s) | Geoffrey Marcy et al. |
| Detection method | Doppler spectroscopy |
| Opening place |  |
| Opening status | Posted by |
| Other designations | |
| HIP 97546 b | |
System Features
The exoplanet is a gas giant , with a minimum mass m sin i , which is only 75% of the mass of Jupiter [1] . It revolves around HD 187085 in a strongly elliptical orbit ( eccentricity 0.47, according to other sources 0.33 [4] ) at an average distance of 2.05 AU and makes a complete revolution in 986 Earth days [1] .
Since the exoplanet has a high eccentricity, its distance from the star varies from 1.09 a.u. at the pericenter up to 3.01 AU in the apocenter . This leads to the fact that it periodically falls into the habitable zone , which is located at a distance of 1.48 a.u. from HD 187085 [2] .
The system’s parent star, HD 187085 , is a yellow dwarf of spectral class G0V; its mass and temperature are 1.22 M соответственно and 6075 K, respectively [1] . A star is much younger than our daylight : its approximate age is 3.3 billion years [1] .
See also
- HD 181720 b
- HD 173416 b
- HD 175167 b
- HD 180,902 b
- HD 181342 b
Notes
- ↑ 1 2 3 4 5 6 7 8 9 Planet HD 187085 b (English) . The Extrasolar Planets Encyclopaedia. Date of treatment July 30, 2013.
- ↑ 1 2 3 4 5 HD 187085 . Planetary systems. Date of treatment July 30, 2013.
- ↑ HD 187085 (English) (inaccessible link) . Exoplanets. Date of treatment July 30, 2013. Archived November 25, 2009.
- ↑ Sreekumar T. Balan (UCL), Ofer Lahav (UCL). Orbital Parameters of Extra-solar Planets from Radial Velocities . Astrophysics (23 May 2008). Date of treatment July 30, 2013.