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• Sigma_Orionis abstract "Sigma Orionis or Sigma Ori (σ Orionis, σ Ori) is a five-star system in the constellation Orion, just to the southwest of Alnitak. It is approximately 1,150 light years from Earth.The primary component is the binary Sigma Orionis AB, with the two stars being a mere 0.25 arcseconds apart. Both stars are hydrogen-fusing dwarfs only a few million years old. The brighter one, Sigma Orionis A, is a blue O-type star with an apparent visual magnitude of +4.2. Sigma Orionis B is a B-type star with an apparent visual magnitude of +5.1. The pair orbit each other every 170 years at a distance of about 90 AU. A and B have very hot surfaces, around 32,000 and 29,600 kelvins, radiating at about 35,000 and 30,000 solar luminosities, respectively. Temperature and luminosity give masses of 18 and 13.5 solar masses, making the close AB pair among the most massive of visual binaries.The next brightest stars in the system are Sigma Orionis D and E, which lie about 4,600 and 15,000 AU respectively from the AB pair. Both are seven solar mass B-type dwarf stars with magnitudes of 6.62 and 6.66. Sigma Orionis E is a prototype of the strange \"helium-rich\" stars, which have significantly large amounts of helium.The last star in the system is Sigma Orionis C, an A-type dwarf star. C is the closest to the AB pair, about 3,900 AU away.".
• Sigma_Orionis thumbnail Orion_constellation_map.svg?width=300.
• Sigma_Orionis wikiPageID "3991369".
• Sigma_Orionis wikiPageLength "3701".
• Sigma_Orionis wikiPageOutDegree "30".
• Sigma_Orionis wikiPageRevisionID "705519324".
• Sigma_Orionis wikiPageWikiLink Alnitak.
• Sigma_Orionis wikiPageWikiLink Bayer_designation.
• Sigma_Orionis wikiPageWikiLink Binary_star.
• Sigma_Orionis wikiPageWikiLink Bright_Star_Catalogue.
• Sigma_Orionis wikiPageWikiLink Category:A-type_main-sequence_stars.
• Sigma_Orionis wikiPageWikiLink Category:B-type_main-sequence_stars.
• Sigma_Orionis wikiPageWikiLink Category:Bayer_objects.
• Sigma_Orionis wikiPageWikiLink Category:Durchmusterung_objects.
• Sigma_Orionis wikiPageWikiLink Category:Flamsteed_objects.
• Sigma_Orionis wikiPageWikiLink Category:HR_objects.
• Sigma_Orionis wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
• Sigma_Orionis wikiPageWikiLink Category:Hipparcos_objects.
• Sigma_Orionis wikiPageWikiLink Category:Multiple_star_systems.
• Sigma_Orionis wikiPageWikiLink Category:O-type_main-sequence_stars.
• Sigma_Orionis wikiPageWikiLink Category:Orion_(constellation).
• Sigma_Orionis wikiPageWikiLink Constellation.
• Sigma_Orionis wikiPageWikiLink Durchmusterung.
• Sigma_Orionis wikiPageWikiLink Flamsteed_designation.
• Sigma_Orionis wikiPageWikiLink Henry_Draper_Catalogue.
• Sigma_Orionis wikiPageWikiLink Hipparcos.
• Sigma_Orionis wikiPageWikiLink Orion_(constellation).
• Sigma_Orionis wikiPageWikiLink SX_Arietis_variable.
• Sigma_Orionis wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
• Sigma_Orionis wikiPageWikiLink Solar_luminosity.
• Sigma_Orionis wikiPageWikiLink Stellar_classification.
• Sigma_Orionis wikiPageWikiLink File:The_region_of_Orion’s_Belt_and_the_Flame_Nebula.jpg.
• Sigma_Orionis wikiPageWikiLinkText "Sigma Orionis".
• Sigma_Orionis wikiPageWikiLinkText "σ Ori AB".
• Sigma_Orionis wikiPageWikiLinkText "σ Ori C".
• Sigma_Orionis wikiPageWikiLinkText "σ Ori D".
• Sigma_Orionis wikiPageWikiLinkText "σ Ori E".
• Sigma_Orionis wikiPageWikiLinkText "σ Ori".
• Sigma_Orionis appmagV "4.2".
• Sigma_Orionis bV "?/?/−0.02/−0.20/−0.18".
• Sigma_Orionis class "O9V/B0.5V/A2V/B2V/B2Vp".
• Sigma_Orionis constell Orion_(constellation).
• Sigma_Orionis dec "2160.0".
• Sigma_Orionis epoch "J2000".
• Sigma_Orionis ra "20324.8".
• Sigma_Orionis uB "?/?/−0.25/−0.87/−0.86".
• Sigma_Orionis variable "No/No/No/No/SX Ari".
• Sigma_Orionis wikiPageUsesTemplate Template:Location_mark.
• Sigma_Orionis wikiPageUsesTemplate Template:Refimprove.
• Sigma_Orionis wikiPageUsesTemplate Template:Reflist.
• Sigma_Orionis wikiPageUsesTemplate Template:Starbox_begin.
• Sigma_Orionis wikiPageUsesTemplate Template:Starbox_catalog.
• Sigma_Orionis wikiPageUsesTemplate Template:Starbox_character.
• Sigma_Orionis wikiPageUsesTemplate Template:Starbox_end.
• Sigma_Orionis wikiPageUsesTemplate Template:Starbox_image.
• Sigma_Orionis wikiPageUsesTemplate Template:Starbox_observe.
• Sigma_Orionis wikiPageUsesTemplate Template:Starbox_reference.
• Sigma_Orionis wikiPageUsesTemplate Template:Stars_of_Orion.
• Sigma_Orionis subject Category:A-type_main-sequence_stars.
• Sigma_Orionis subject Category:B-type_main-sequence_stars.
• Sigma_Orionis subject Category:Bayer_objects.
• Sigma_Orionis subject Category:Durchmusterung_objects.
• Sigma_Orionis subject Category:Flamsteed_objects.
• Sigma_Orionis subject Category:HR_objects.
• Sigma_Orionis subject Category:Henry_Draper_Catalogue_objects.
• Sigma_Orionis subject Category:Hipparcos_objects.
• Sigma_Orionis subject Category:Multiple_star_systems.
• Sigma_Orionis subject Category:O-type_main-sequence_stars.
• Sigma_Orionis subject Category:Orion_(constellation).
• Sigma_Orionis hypernym System.
• Sigma_Orionis type CelestialBody.
• Sigma_Orionis type Place.
• Sigma_Orionis type Star.
• Sigma_Orionis type Diacritic.
• Sigma_Orionis type Redirect.
• Sigma_Orionis type Location.
• Sigma_Orionis type Place.
• Sigma_Orionis type Thing.
• Sigma_Orionis comment "Sigma Orionis or Sigma Ori (σ Orionis, σ Ori) is a five-star system in the constellation Orion, just to the southwest of Alnitak. It is approximately 1,150 light years from Earth.The primary component is the binary Sigma Orionis AB, with the two stars being a mere 0.25 arcseconds apart. Both stars are hydrogen-fusing dwarfs only a few million years old. The brighter one, Sigma Orionis A, is a blue O-type star with an apparent visual magnitude of +4.2.".
• Sigma_Orionis label "Sigma Orionis".
• Sigma_Orionis sameAs Q14224.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs سیگما_شکارچی.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs סיגמא_באוריון.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs オリオン座シグマ星.
• Sigma_Orionis sameAs 오리온자리_시그마.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs m.0bbfcd.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs Sigma_Orionis.
• Sigma_Orionis sameAs Сигма_Оріона.
• Sigma_Orionis sameAs Q14224.
• Sigma_Orionis sameAs 參宿增一.

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