HD 187123
HD 187123 is an 8th magnitude G-type main sequence star located approximately 150 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.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 46m 58.1123s[1] |
| Declination | +34° 25′ 10.2799″[1] |
| Apparent magnitude (V) | 7.89 |
| Characteristics | |
| Spectral type | G5V |
| Astrometry | |
| Proper motion (μ) | RA: 142.581±0.053[1] mas/yr Dec.: −123.603±0.063[1] mas/yr |
| Parallax (π) | 21.7316 ± 0.0336[1] mas |
| Distance | 150.1 ± 0.2 ly (46.02 ± 0.07 pc) |
| Details | |
| Other designations | |
| Database references | |
| SIMBAD | data |
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HD 187123 has a planetary system with at least two planets in it. Artist's rendition of planets HD 187123b and c.
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[2] found a possible planet orbiting the star.[3] There were also indications of another, more distant body orbiting the star and this claim was published in 2006.[4] This planet was confirmed in 2009.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.5074±0.0026 MJ | 0.04213±0.00034 | 3.0965886±0.0000043 | 0.0093±0.0046 | — | — |
| c | >1.818±0.035 MJ | 4.417±0.054 | 3324±46 | 0.280±0.022 | — | — |
See also
- List of extrasolar planets
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- "British student shows Nasa new planet". BBC News. September 25, 1998. Retrieved December 31, 2011.
- 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. CiteSeerX 10.1.1.37.5463. doi:10.1086/316287.
- Wright, J. T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553.
- 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.
- Feng, Y. Katherina; et al. (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800 (1). 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22.
External links
- "Notes for star HD 187123". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-25.
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