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HD 169830

HD 169830 is a yellow-white dwarf star (spectral type F9V) in the constellation of Sagittarius, 118.46 light years from our solar system. It is known to be orbited by two large Jupiter-like planets.


This star is classified as spectral type F7V, meaning the color of the photosphere of this star is yellow-white. It takes 9.5 days for the star to rotate once around its axis. This star is 40% more massive and 84% larger than our Sun. Combining the mass and radius makes the surface gravity only 41% that of our Sun.

Planetary system

On May 4, 2000, the Geneva Extrasolar Planet Search Team announced the discovery of a 3 MJ planet in a 226 day orbit.[2] Three years later on June 30, 2003, the same two teams using the same method discovered a 3.5 MJ second planet orbiting about halfway between the distances of Mars and Jupiter (or in the middle of the asteroid belt) in the solar system from the star.

The HD 169830 system[3]
(in order from star)
Mass Semimajor axis
Orbital period
b >2.88 MJ 0.81 225.62 ± 0.22 0.31 ± 0.01
c >4.04 MJ 3.60 2102 ± 264 0.33 ± 0.02

See also

* HD 69830
* List of extrasolar planets


1. ^ a b c d e van Leeuwen, F. (2007). "HIP 90485". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=90186. Retrieved 2009-12-12.
2. ^ "Exoplanets Galore!". European Southern Observatory. 4 May 2000. http://www.eso.org/public/outreach/press-rel/pr-2000/pr-13-00.html. Retrieved 8 August 2009.
3. ^ Mayor et al.; Udry, S.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Burnet, M. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics 415: 391–402. doi:10.1051/0004-6361:20034250. http://www.aanda.org/articles/aa/full/2004/07/aa0250/aa0250.html.

* Raghavan et al.; Henry, Todd J.; Mason, Brian D.; Subasavage, John P.; Jao, Wei‐Chun; Beaulieu, Thom D.; Hambly, Nigel C. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal 646 (1): 523–542. doi:10.1086/504823. http://www.iop.org/EJ/article/0004-637X/646/1/523/64035.html.
* Naef et al.; Mayor, M.; Pepe, F.; Queloz, D.; Santos, N. C.; Udry, S.; Burnet, M. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics 375 (1): 205–218. doi:10.1051/0004-6361:20010841. http://www.aanda.org/articles/aa/full/2001/31/aa10239/aa10239.html.

External links

* "Notes for star HD 169830". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+169830. Retrieved 2006-04-14.
* John Whatmough. "HD 169830". Extrasolar Visions. http://www.extrasolar.net/startour.asp?StarCatId=&StarId=114. Retrieved 2006-04-14.
* Extrasolar Planet Interactions by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona

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