HD 154857

HD 154857 is a yellow main-sequence star approximately 224 light years away in the constellation of Ara.

Planetary system

There is one confirmed and one unconfirmed planet discovered in 2004 and 2007 respectively. The confirmed planet HD 154857 b has mass >1.8 times that of Jupiter. It orbits the star 20% further than Earth-Sun distance, taking 409 days with 47% eccentricity. The unconfirmed planet HD 154857 c with unknown mass takes 1900 days to orbit around the star with 25% eccentricity.

PlanetboxOrbit
exoplanet = b
mass = >1.8±0.4
period = 409±1
semimajor = 1.2±0.2
eccentricity = 0.47±0.02PlanetboxOrbit hypothetical
exoplanet = c
mass = >?
period = 1900
semimajor = ?
eccentricity = 0.25

ee also

* List of stars with confirmed extrasolar planets

References

*cite journal |url=http://adsabs.harvard.edu/abs/2004ApJ...617..575M |author=McCarthy, Chris; Butler, R. Paul; Tinney, C. G.; Jones, Hugh R. A.; Marcy, Geoffrey W.; Carter, Brad; Penny, Alan J.; Fischer, Debra A. |title=Multiple Companions to HD 154857 and HD 160691 |work=Astronomy Abstract Service |year=2004 |volume=617 |issue=1 |pages=575–579 |accessdate=2007-07-08 |doi=10.1086/425214 |journal=The Astrophysical Journal
*cite journal | url=http://www.journals.uchicago.edu/doi/abs/10.1086/513563 | author=O'Toole "et al." | title=New Planets around Three G Dwarfs | journal=The Astrophysical Journal | volume=660 | issue=2 | year=2007 | pages=1636 – 1641 | doi=10.1086/513563 ( [http://xxx.lanl.gov/abs/astro-ph/0702213 web Preprint] )

* [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HIP%2084069 HIP 84069] - Catalog
* [http://aladin.u-strasbg.fr/AladinPreview?-c=17+11+15.7219-56+40+50.865&ident=HD+154857&submit=Aladin+previewer Image HD 154857]

External links

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* [http://planetquest.jpl.nasa.gov/atlas/atlas_profile.cfm?Planet=261 http://planetquest.jpl.nasa.gov]