HD 17156 c

Planetbox begin
name = HD 17156 c Planetbox star
star = HD 17156
constell = Cassiopeia
RA = RA|02|49|04.49
DEC = DEC|+71|45|11.64
dist_ly = 255.19
dist_pc = 78.24
class = G0Planetbox orbit
separation =
position_angle =
semimajor = 0.481±0.001
semimajor_no_units =
eccentricity = 0.136±0.005
period = 111.314±3
period_year =
inclination =
ang_dist = 6.147
long_peri =
arg_peri =
t_peri =
t_peri_no_jd =
t_transit =
t_transit_no_jd =
t_approach =
semi-amp = Planetbox character
mass = >0.063 ± 0.007 Planetbox discovery
discovery_date = 20 March 2008
discoverers = Short "et al."
discovery_method = Planetary perturbation
discovery_site = flag|United States
discovery_status = Unconfirmed

HD 17156 c is a plausible extrasolar planet approximately 255 light-years away in the constellation of Cassiopeia. The planet is thought to be orbiting the yellow giant star HD 17156. This planet has a minimum mass of 0.063 Jupiter mass (or 20 Earth masses) and takes about 111.314 days or 0.305 year to orbit the star, classifying the planet as a cool Neptunian planet. This put it in the distance of 0.481 astronomical units or 72.0 gigameters with a moderate eccentricity.

The two planets "exchange angular momentum in a 5:1 mean motion resonance".

This planet was discovered on the vernal equinox of 2008 by analyzing pertubations with the inner planet HD 17156 b. The paper was submitted to "Astrophysical Journal Letters" 20 March and revised 14 June.

See also

* HD 17156 b

References

* cite journal |url=http://fr.arxiv.org/abs/0803.2935 |author= Donald Short, William F. Welsh, Jerome A. Orosz, Gur Windmiller |title=Orbital Dynamics Of A Second Planet In HD17156
journal=ApJ. Letters |eprint=0803.2935 |class=astro-ph |year=2008 |volume= |issue= |pages= |accessdate=2008-08-06

External links

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