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- Q1334636 subject Q10650.
- Q1334636 subject Q15332630.
- Q1334636 subject Q6392646.
- Q1334636 subject Q7033946.
- Q1334636 subject Q8430646.
- Q1334636 abstract "HR 8799 b is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus, orbiting the 6th magnitude Lambda Boötis star HR 8799. It has a mass between 4 and 7 Jupiter masses and a radius from 10 to 30% larger than Jupiter's. It orbits at 68 AU from HR 8799 (or 7 AU inside the inner edge of the dust disk orbiting the star) with an unknown eccentricity and a period of 460 years, and is the outermost known planet in the HR 8799 system. Along with two other planets orbiting HR 8799, the planet was discovered on November 13, 2008 by Marois et al., using the Keck and Gemini observatories in Hawaii. These planets were discovered using the direct imaging technique.In 2009 it was discovered that the Hubble Space Telescope had in fact directly imaged HR 8799 b eleven years earlier, in 1998, suggesting that more exoplanets might be revealed through analysis of HST photographic archives. Additional precovery images were also obtained by reanalyzing data taken in 2002 at the Subaru Telescope and in 2005 and 2007 at the W.M Keck Observatory .Broadband photometry of HR 8799 b shows that it has thicker clouds in its atmosphere than do older, higher surface gravity substellar objects of the same effective temperature.Near infrared H band and K band spectroscopy of HR8799b published in May 2011 indicate a hydrogen rich, dusty atmosphere with disequilibrium CO / CH4 chemistry.Near infrared spectroscopy from 995 to 1769 nanometers made with the Palomar Obervatory show evidence of ammonia and/or acetylene as well as carbon dioxide, and some methane.".
- Q1334636 thumbnail Exoplanet_Comparison_HR_8799_b.png?width=300.
- Q1334636 wikiPageExternalLink planete.php?etoile=HR+8799&planete=b.
- Q1334636 wikiPageWikiLink Q10650.
- Q1334636 wikiPageWikiLink Q111130.
- Q1334636 wikiPageWikiLink Q124313.
- Q1334636 wikiPageWikiLink Q15332630.
- Q1334636 wikiPageWikiLink Q1783528.
- Q1334636 wikiPageWikiLink Q1811.
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- Q1334636 wikiPageWikiLink Q319.
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- Q1334636 wikiPageWikiLink Q531.
- Q1334636 wikiPageWikiLink Q584300.
- Q1334636 wikiPageWikiLink Q591022.
- Q1334636 wikiPageWikiLink Q6392646.
- Q1334636 wikiPageWikiLink Q651336.
- Q1334636 wikiPageWikiLink Q7033946.
- Q1334636 wikiPageWikiLink Q730477.
- Q1334636 wikiPageWikiLink Q744667.
- Q1334636 wikiPageWikiLink Q782.
- Q1334636 wikiPageWikiLink Q8430646.
- Q1334636 wikiPageWikiLink Q8864.
- Q1334636 wikiPageWikiLink Q8928.
- Q1334636 comment "HR 8799 b is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus, orbiting the 6th magnitude Lambda Boötis star HR 8799. It has a mass between 4 and 7 Jupiter masses and a radius from 10 to 30% larger than Jupiter's. It orbits at 68 AU from HR 8799 (or 7 AU inside the inner edge of the dust disk orbiting the star) with an unknown eccentricity and a period of 460 years, and is the outermost known planet in the HR 8799 system.".
- Q1334636 label "HR 8799 b".
- Q1334636 depiction Exoplanet_Comparison_HR_8799_b.png.