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 5 and 11 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.

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dbpprop: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 5 and 11 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.
  • {{Corpo celeste |tipo = Pianeta |nome = HR 8799 b |stella_madre = HR 8799 |immagine= File:HR 8799. jpg |didascalia= La stella (al centro, oscurata dal coronografo) e i pianeti b e c, circondati da un cerchio. |dimensione_immagine=270px |sigla_costellazione = Peg |ar = 23 07 28,7150 |declinaz = +21° 08′ 03,302″ |distanza_anniluce = 129 ± 4 a.l. |scoperta_autori=Marois et al, Telescopio Keck - Gemini Nord |data=13 novembre 2008 |categoria=Gigante gassoso o sub-nana bruna |epoca=J2000.0 |semiasse_maggiore= ~ 10000000000 km ~ 68 UA |eccentricità= sconosciuta |periodo_orbitale= ~ 460 anni |diametro_med= 1,2 ± 0,1 MJ |massa= 7 ± 3 MJ |temp_med=870 ± 50 K HR 8799 b è un pianeta extrasolare che orbita attorno alla stella bianca di sequenza principale HR 8799, situata nella costellazione di Pegaso a 129 anni luce dal sistema solare. È il pianeta più esterno del sistema planetario. La massa del pianeta è compresa tra le 4 e le 10 volte quella di Giove, con un raggio dal 10 al 30% superiore rispetto a quello del gigante del sistema solare. Il pianeta orbita ad una distanza media dalla stella madre di circa 68 UA (a 7 UA dal bordo più interno della cintura asteroidale), con un'eccentricità orbitale ancora sconosciuta ed un periodo stimato in 460 anni. Assieme agli altri due pianeti del sistema, c e d, HR 8799 b è stato scoperto il 13 novembre 2008 tramite i telescopi Keck e Gemini Nord, nelle Hawaii, che hanno consentito l'osservazione diretta dei corpi celesti.
dbpprop:caption
  • An artist's impression of HR 8799 b
dbpprop:decProperty
  • 3.302 (xsd:double)
  • 8 (xsd:integer)
  • 21 (xsd:integer)
dbpprop:discoverers
  • Marois et al.
dbpprop:discoveryDate
  • November 13, 2008
dbpprop:discoveryMethod
dbpprop:discoverySite
dbpprop:discoveryStatus
  • Published
dbpprop:epoch
  • 2008-09-18 (xsd:date)
dbpprop:mass
dbpprop:periodYear
  • ~ 460
dbpprop:planet
  • b
dbpprop:positionAngle
  • 62.42 (xsd:double)
dbpprop:raProperty
  • 7 (xsd:integer)
  • 23 (xsd:integer)
  • 28.715 (xsd:double)
dbpprop:radius
  • 1.2 ± 0.1
dbpprop:semimajor
  • ~ 68Value given assuming the planet's orbit is circular and is being observed face-on.
dbpprop:semimajorGigameter
  • ~ 10000
dbpprop:separation
  • 68 (xsd:integer)
dbpprop:separationMas
  • 1724Calculated from the separations in the East and North directions which are 1.528 and 0.798
dbpprop:simbad
  • HD+218396b
dbpprop:simbadLinkProperty
  • HR+8799
  • V V342 Peg -- Variable Star of gamma Dor type
dbpprop:skyProperty
  • +
  • 3.302 (xsd:double)
  • 7 (xsd:integer)
  • 8 (xsd:integer)
  • 21 (xsd:integer)
  • 23 (xsd:integer)
  • 28.715 (xsd:double)
  • 129 (xsd:integer)
dbpprop:star
  • HR+8799
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rdfs: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 5 and 11 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.
  • {{Corpo celeste |tipo = Pianeta |nome = HR 8799 b |stella_madre = HR 8799 |immagine= File:HR 8799. jpg |didascalia= La stella (al centro, oscurata dal coronografo) e i pianeti b e c, circondati da un cerchio. |dimensione_immagine=270px |sigla_costellazione = Peg |ar = 23 07 28,7150 |declinaz = +21° 08′ 03,302″ |distanza_anniluce = 129 ± 4 a.l.
rdfs:label
  • HR 8799 b
  • HR 8799 b
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foaf:depiction
foaf:page
is dbpprop:exoplanet of