HD 187123
HD 187123
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
Constellation | Cygnus |
Right ascension | 19h 46m 58.113s[1] |
Declination | +34° 25′ 10.28″[1] |
Apparent magnitude (V) | 7.89 |
| Characteristics | |
Spectral type | G5V |
| Astrometry | |
| Proper motion (μ) | RA: 7002143180000000000♠143.18±0.39[1] mas/yr Dec.: 2997876090000000000♠−123.91±0.48[1] mas/yr |
| Parallax (π) | 20.72 ± 0.53[1] mas |
| Distance | 157 ± 4 ly (48 ± 1 pc) |
| Details | |
| Other designations | |
BD+34°3708, HIP 97336, LTT 15779, SAO 68845 | |
| Database references | |
| SIMBAD | data |
HD 187123 has a planetary system with at least two planets in it. Artist's rendition of planets HD 187123b and c.
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.
Contents
1 Planetary system
2 See also
3 References
4 External links
Planetary system[edit]
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 | 6999507399999999999♠>0.5074±0.0026 MJ | 6998421300000000000♠0.04213±0.00034 | 7000309658860000000♠3.0965886±0.0000043 | 6997929999999999999♠0.0093±0.0046 | — | — |
c | 7000181800000000000♠>1.818±0.035 MJ | 7000441700000000000♠4.417±0.054 | 7003332400000000000♠3324±46 | 6999280000000000000♠0.280±0.022 | — | — |
See also[edit]
- List of extrasolar planets
References[edit]
^ abcde van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
Vizier catalog entry
^ "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. 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. 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22.
External links[edit]
"Notes for star HD 187123". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-25.
Coordinates: 
19h 46m 58.1130s, +34° 25′ 10.288″
 | This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it. |
Categories:
- Cygnus (constellation)
- G-type main-sequence stars
- Henry Draper Catalogue objects
- Hipparcos objects
- Planetary systems with two confirmed planets
- Durchmusterung objects
- Main-sequence-star stubs
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