HD 187123 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 187123 | |
| Constellation | Cygnus | |
| Right ascension | (α) | 19h 46m 58.1130s |
| Declination | (δ) | +34° 25′ 10.288″ |
| Distance | 156.28 ly (47.92 pc) | |
| Spectral type | G5V | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.0426 AU |
| Periastron | (q) | 0.0411 AU |
| Apastron | (Q) | 0.0441 AU |
| Eccentricity | (e) | 0.035 ± 0.015 |
| Orbital period | (P) | 3.097 d (0.008479 y) |
| Orbital speed | (υ) | 150 km/s |
| Argument of periastron |
(ω) | 20° |
| Time of periastron | (T0) | 2,451,029.73 JD |
| Semi-amplitude | (K) | 70.6 m/s |
| Physical characteristics | ||
| Mass | (m) | >0.52 MJ |
| Discovery information | ||
| Discovery date | 9 September 1998 | |
| Discoverer(s) | Butler, Marcy, Vogt, Apps et al. | |
| Discovery method | radial velocity | |
| Discovery site | California, USA | |
| Discovery status | Published | |
HD 187123 b is a typical "hot Jupiter" located approximately 156 light-years away in the constellation of Cygnus, orbiting the star HD 187123. It has a mass about half that of Jupiter and it orbits in a very tight, round orbit around the star every three days.[1][2]
The star has also been monitored for possible transits by the planet, but none was found.
See also
References
- ↑ Butler, R. Paul; et al. (1998). "A Planet with a 3.1 Day Period around a Solar Twin". Publications of the Astronomical Society of the Pacific 110 (754): 1389–1393. Bibcode:1998PASP..110.1389B. doi:10.1086/316287.
- ↑ Wright, J. T.; et al. (2009). "Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems". The Astrophysical Journal 693 (2): 1084–1099. arXiv:0812.1582. Bibcode:2009ApJ...693.1084W. doi:10.1088/0004-637X/693/2/1084.
External links
- "Notes for planet HD 187123 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-25.
- "HD 187123". Exoplanets. Retrieved 2008-08-25.
Coordinates: 
19h 46m 58.1130s, +34° 25′ 10.288″
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