Jump to content

HD 17156 c

Coordinates: Sky map 02h 49m 44.49s, +71° 45′ 11.64″
From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Dcirovic (talk | contribs) at 07:30, 31 May 2016 (→‎References: clean up using AWB). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Template:Planetbox begin Template:Planetbox star Template:Planetbox orbit Template:Planetbox character Template:Planetbox discovery Template:Planetbox reference Template:Planetbox end

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 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 perturbations with the inner planet HD 17156 b. The paper was submitted to Astrophysical Journal Letters 20 March and revised 14 June.

See also

References

  • Donald Short; William F. Welsh; Jerome A. Orosz; Gur Windmiller (2008). "Orbital Dynamics Of A Second Planet In HD17156". arXiv:0803.2935. {{cite arXiv}}: Cite has empty unknown parameters: |1=, |issue=, and |volume= (help)