| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| 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 | ||
| Semimajor 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. |
|
| Detection 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. However, there is a very slight possibility that the signal, thought to be caused by the planet, may be from starspots and stellar pulsations instead.[1][2]
The star has also been monitored for possible transits by the planet, but none was found.
See also [link]
References [link]
- ^ 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. https://www.journals.uchicago.edu/doi/full/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. https://iopscience.iop.org/0004-637X/693/2/1084/fulltext/.
External links [link]
- "Notes for planet HD 187123 b". The Extrasolar Planets Encyclopaedia. https://exoplanet.eu/planet.php?p1=HD+187123&p2=b. Retrieved 2008-08-25.
- "HD 187123". Exoplanets. https://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+187123. Retrieved 2008-08-25.
Coordinates: 
19h 46m 58.1130s, +34° 25′ 10.288″
 |
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https://wn.com/HD_187123_b
HD 187123
HD 187123 is an 8th magnitude G-type main sequence star located approximately 156 light-years away in the constellation of Cygnus. Like our Sun, it is a yellow dwarf (spectral type G5V). Being at a distance of about 160 light-years it is not visible to the unaided eye. However, it should be easy target with binoculars or small telescope.
Planetary system
In 1998 the California and Carnegie Planet Search team, after following a suggestion by Kevin Apps, a Briton who at the time was an undergraduate student found a possible planet orbiting the star. There were also indications of another, more distant body orbiting the star and this claim was published in 2006. This planet was confirmed in 2009.
See also
References
External links
Coordinates: 
19h 46m 58.1130s, +34° 25′ 10.288″
