HD 209458

      seventh-magnitude star 150 light-years away in the constellation Pegasus, the first star having a planet detected by its transit across the star's face. The star, which has physical characteristics similar to those of the Sun, was shown in late 1999 to have a planet by detection of the planet's gravitational effects on the star's motion. Shortly afterward, astronomers independently confirmed the planet's presence by observing that HD 209458 changed in brightness with the same 3.5-day period predicted from the discovery data for the planet's orbit. Although the planet could not be seen directly, its passages between its star and Earth provided important information about its physical properties and atmosphere not otherwise available. The extrasolar planet is about 1.3 times the size of Jupiter but has only two-thirds of Jupiter's mass. It orbits surprisingly close to the star—about 10 stellar radii.

John Donald Fernie

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Universalium. 2010.

Look at other dictionaries:

  • HD 209458 b — Extrasolar planet List of extrasolar planets Size comparison of HD 209458 b with Jupiter. Parent star Star …   Wikipedia

  • HD 209458 — Starbox begin name=HD 209458 Starbox image caption=The red circle shows the location of HD 209458 in Pegasus. Starbox observe epoch=J2000 ra=22h 03m 10.8s dec=+18° 53 prime; 04 Prime; appmag v=7.65 constell=Pegasus Starbox character class=F8 G0 V …   Wikipedia

  • HD 209458 b — ist ein 160 Lichtjahre von der Erde entfernter Exoplanet, der von seinen Entdeckern nach dem altägyptischen Fruchtbarkeits und Todesgott inoffiziell auch Osiris genannt wird. Künstlerische Darstellung von Osiris vor seinem Stern HD 209458 mit… …   Deutsch Wikipedia

  • HD 209458 b — Concepción artística de HD 209458 b durante un tránsito. Descubrimiento Descubridor D. Charbonneau, T. Brown, D. Latham …   Wikipedia Español

  • HD 209458 — Datenbanklinks zu HD 209458 Stern HD 209458 / V376 Pegasi / BD +18° 4917 …   Deutsch Wikipedia

  • HD 209458 b — Pour les articles homonymes, voir Osiris (homonymie). HD 209458 b (Osiris) Tailles comparées de Jupiter et de HD 209458 b …   Wikipédia en Français

  • Hd 209458 — Données d observation (Époque J2000.0) Ascension droite 22h 03m 10,8s Déclinaison …   Wikipédia en Français

  • HD 209458 — Données d observation (Époque J2000.0) Ascension droite 22h 03m 10,8s Déclinaison …   Wikipédia en Français

  • HD 209458 — Звезда Наблюдательные данные (Эпоха J2000.0) …   Википедия

  • HD 209458 b — У этого термина существуют и другие значения, см. Осирис (значения). Осирис (HD 209458 b) Экзопланета Списки экзопланет …   Википедия

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