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• Iota_Orionis abstract "Iota Orionis (ι Ori, ι Orionis) is a star in the equatorial constellation of Orion the hunter. The apparent visual magnitude of Iota Orionis is 2.77, making it the eighth brightest member of Orion.Iota Orionis is the brightest star in an asterism known as Orion's sword. It has the traditional names Hatsya or Hatysa and in Arabic, Na’ir al Saif, which means simply \"the Bright One of the Sword.\" From parallax measurements, it is located at a distance of roughly 1,330 light-years (410 parsecs) from Earth.Iota Orionis is a quadruple system dominated by a massive spectroscopic binary with an eccentric (e=0.764), 29-day orbit. The two components of ι Ori A are a stellar class O9 III star (blue giant) and a class B0.8 III/IV star about 2 magnitudes fainter. The collision of the stellar winds from this pair makes the system a strong X-ray source. Oddly, the two objects of this system appear to have different ages, with the secondary being about double the age of the primary. In combination with the high eccentricity of their orbit, this suggests that the binary system was created through a capture, rather than by being formed together and undergoing a mass transfer. This capture may have occurred, for example, through an encounter between two binary systems.ι Ori has a B8 giant companion at 11\" (approximately 5,000 AU) which has been shown to be variable, and likely to be a young stellar object. There is also a fainter A0 star at 49\" catalogued as ι Ori C.".
• Iota_Orionis thumbnail Orion_constellation_map.svg?width=300.
• Iota_Orionis wikiPageExternalLink nairalsaif.html.
• Iota_Orionis wikiPageExternalLink Iota_Orionis.html.
• Iota_Orionis wikiPageID "920344".
• Iota_Orionis wikiPageLength "11114".
• Iota_Orionis wikiPageOutDegree "49".
• Iota_Orionis wikiPageRevisionID "706473019".
• Iota_Orionis wikiPageWikiLink 2MASS.
• Iota_Orionis wikiPageWikiLink Aitken_Double_Star_Catalogue.
• Iota_Orionis wikiPageWikiLink Apparent_magnitude.
• Iota_Orionis wikiPageWikiLink Arabic.
• Iota_Orionis wikiPageWikiLink Asterism_(astronomy).
• Iota_Orionis wikiPageWikiLink Bayer_designation.
• Iota_Orionis wikiPageWikiLink Binary_star.
• Iota_Orionis wikiPageWikiLink Blue_giant.
• Iota_Orionis wikiPageWikiLink Bright_Star_Catalogue.
• Iota_Orionis wikiPageWikiLink Catalogues_of_Fundamental_Stars.
• Iota_Orionis wikiPageWikiLink Category:2MASS_objects.
• Iota_Orionis wikiPageWikiLink Category:A-type_stars.
• Iota_Orionis wikiPageWikiLink Category:B-type_giants.
• Iota_Orionis wikiPageWikiLink Category:B-type_subgiants.
• Iota_Orionis wikiPageWikiLink Category:Bayer_objects.
• Iota_Orionis wikiPageWikiLink Category:Durchmusterung_objects.
• Iota_Orionis wikiPageWikiLink Category:Flamsteed_objects.
• Iota_Orionis wikiPageWikiLink Category:HR_objects.
• Iota_Orionis wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
• Iota_Orionis wikiPageWikiLink Category:Hipparcos_objects.
• Iota_Orionis wikiPageWikiLink Category:Multiple_star_systems.
• Iota_Orionis wikiPageWikiLink Category:O-type_giants.
• Iota_Orionis wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
• Iota_Orionis wikiPageWikiLink Category:Orion_(constellation).
• Iota_Orionis wikiPageWikiLink Category:Orion_variables.
• Iota_Orionis wikiPageWikiLink Category:Spectroscopic_binaries.
• Iota_Orionis wikiPageWikiLink Category:Stars_with_proper_names.
• Iota_Orionis wikiPageWikiLink Celestial_equator.
• Iota_Orionis wikiPageWikiLink Constellation.
• Iota_Orionis wikiPageWikiLink Durchmusterung.
• Iota_Orionis wikiPageWikiLink Flamsteed_designation.
• Iota_Orionis wikiPageWikiLink Henry_Draper_Catalogue.
• Iota_Orionis wikiPageWikiLink Hipparcos.
• Iota_Orionis wikiPageWikiLink Orion_(constellation).
• Iota_Orionis wikiPageWikiLink Orion_variable.
• Iota_Orionis wikiPageWikiLink Orions_Sword.
• Iota_Orionis wikiPageWikiLink Parallax.
• Iota_Orionis wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
• Iota_Orionis wikiPageWikiLink Star.
• Iota_Orionis wikiPageWikiLink Stellar_classification.
• Iota_Orionis wikiPageWikiLink Stellar_wind.
• Iota_Orionis wikiPageWikiLink Variable_star_designation.
• Iota_Orionis wikiPageWikiLink Washington_Double_Star_Catalog.
• Iota_Orionis wikiPageWikiLink X-ray.
• Iota_Orionis wikiPageWikiLink Young_stellar_object.
• Iota_Orionis wikiPageWikiLinkText "Iota Orionis".
• Iota_Orionis wikiPageWikiLinkText "Nair Al Saif".
• Iota_Orionis wikiPageWikiLinkText "ι Ori".
• Iota_Orionis wikiPageWikiLinkText "ι Orionis".
• Iota_Orionis ageMyr "4".
• Iota_Orionis ageMyr "9.4".
• Iota_Orionis ageMyr "~3".
• Iota_Orionis appmagV "2.77".
• Iota_Orionis bV "–0.24".
• Iota_Orionis class "O9 III + B0.8 III/IV".
• Iota_Orionis component "A".
• Iota_Orionis component "B".
• Iota_Orionis component "C".
• Iota_Orionis component "ι Ori Aa".
• Iota_Orionis component "ι Ori Ab".
• Iota_Orionis component "ι Ori B".
• Iota_Orionis constell Orion_(constellation).
• Iota_Orionis eccentricity "0.764".
• Iota_Orionis epoch "J2000".
• Iota_Orionis gravity "3.73".
• Iota_Orionis gravity "3.78".
• Iota_Orionis gravity "4".
• Iota_Orionis inclination "~60".
• Iota_Orionis luminosity "68000".
• Iota_Orionis luminosity "8630".
• Iota_Orionis mass "13.1".
• Iota_Orionis mass "23.1".
• Iota_Orionis metalFe "+0.10".
• Iota_Orionis names "ι Ori A, 2MASS J05352597-0554357".
• Iota_Orionis names "ι Ori B, V2451 Ori, 2MASS J05352645-0554445".
• Iota_Orionis names "ι Ori C, 2MASS J05352920-0554471".
• Iota_Orionis names "ι Orionis, Na’ir al Saif, Hatsya, Hatysa, 44 Orionis, BD−06°1241, FK5 209, HD 37043, HIP 26241, HR 1899, SAO 132323, ADS 4193, WDS J05354-0555".
• Iota_Orionis noHeading "y".
• Iota_Orionis pError "0.22".
• Iota_Orionis parallax "1.4".
• Iota_Orionis periastron "2450072.8".
• Iota_Orionis periodUnitless "2517160.3200000003".
• Iota_Orionis propMoDec "–0.46".
• Iota_Orionis propMoRa "+1.42".
• Iota_Orionis radialV "21.5".
• Iota_Orionis radius "5.4".
• Iota_Orionis radius "8.3".
• Iota_Orionis rotationalVelocity "122".
• Iota_Orionis temperature "18000".
• Iota_Orionis temperature "27000".
• Iota_Orionis temperature "32500".
• Iota_Orionis uB "–1.08".

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