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• Sigma_Scorpii abstract "Sigma Scorpii (σ Sco, σ Scorpii) is a star system in the constellation Scorpius. It has the traditional name Al Niyat, although this name is sometimes also applied to Tau Scorpii, or to the asterism formed by both Sigma and Tau. This system has a combined apparent visual magnitude of +2.88, making it one of the brighter members of the constellation, although greatly outshone by its neighbor Antares. Based upon parallax measurements made during the Hipparcos mission, the distance to Sigma Scorpii is roughly 696 light years (214 parsecs). North et al. (2007) computed a more accurate estimate of 7002568000000000000♠568+75−59 light years (7002174000000000000♠174+23−18 parsecs).The brightest component of the system is a double-lined spectroscopic binary, which means that the pair has not been resolved using a telescope. Instead, their orbit is determined by changes in their combined spectrum caused by the Doppler shift. This indicates that the pair complete an orbit every 33.01 days and have an orbital eccentricity of 0.32.The primary component of the spectroscopic binary, σ Scorpii A, is an evolved giant star with a stellar classification of B1 III. It has around 18 times the mass of the Sun and 12 times the Sun's radius. This star is radiating about 7004290000000000000♠29000 times the luminosity of the Sun from its outer envelope at an effective temperature of 7004261500000000000♠26150 K. This is a variable star of the Beta Cephei type, causing the apparent magnitude to vary between +2.86 and +2.94 with multiple periods of 6999246842900000000♠0.2468429, 6999239671000000000♠0.239671, and 8.2 days. During each pulsation cycle, the temperature of the star varies by 7003400000000000000♠4000±2000 K.The other member of the core pair, σ Scorpii B, is a main sequence star with a classification of B1 V. Orbiting this binary at a separation half an arcsecond, or at least 120 Astronomical Units (AU), four times the Sun–Neptune distance, is the magnitude +5.2 σ Scorpii C, which has an orbital period of over a hundred years. Even farther out at 20 arcseconds, or more than 4500 AU, is σ Scorpii D with a magnitude of +8.7. It is classified as a B9 dwarf.Given its position, youth, and space velocity, the Sigma Scorpii system is a likely member of the Gould Belt, and in particular the Upper Scorpius subgroup of the Scorpius-Centaurus Association (Sco OB2). Recent isochronal ageestimates for the Sigma Scorpii system yield ages of 8–10 million years through comparison of the HR diagram positions for the stars to modern evolutionary tracks. This agrees well with mean age for the Upper Scorpius group which is approximately 11 million years.".
• Sigma_Scorpii thumbnail Scorpius_IAU.svg?width=300.
• Sigma_Scorpii wikiPageID "2225328".
• Sigma_Scorpii wikiPageLength "11049".
• Sigma_Scorpii wikiPageOutDegree "58".
• Sigma_Scorpii wikiPageRevisionID "660088822".
• Sigma_Scorpii wikiPageWikiLink Antares.
• Sigma_Scorpii wikiPageWikiLink Apparent_magnitude.
• Sigma_Scorpii wikiPageWikiLink Asterism_(astronomy).
• Sigma_Scorpii wikiPageWikiLink Astronomical_unit.
• Sigma_Scorpii wikiPageWikiLink Beta_Cephei_variable.
• Sigma_Scorpii wikiPageWikiLink Binary_star.
• Sigma_Scorpii wikiPageWikiLink Catalogues_of_Fundamental_Stars.
• Sigma_Scorpii wikiPageWikiLink Category:B-type_giants.
• Sigma_Scorpii wikiPageWikiLink Category:B-type_main-sequence_stars.
• Sigma_Scorpii wikiPageWikiLink Category:Bayer_objects.
• Sigma_Scorpii wikiPageWikiLink Category:Beta_Cephei_variables.
• Sigma_Scorpii wikiPageWikiLink Category:Flamsteed_objects.
• Sigma_Scorpii wikiPageWikiLink Category:Multiple_star_systems.
• Sigma_Scorpii wikiPageWikiLink Category:Scorpius_(constellation).
• Sigma_Scorpii wikiPageWikiLink Category:Stars_with_proper_names.
• Sigma_Scorpii wikiPageWikiLink Category:Upper_Scorpius.
• Sigma_Scorpii wikiPageWikiLink Constellation.
• Sigma_Scorpii wikiPageWikiLink Doppler_effect.
• Sigma_Scorpii wikiPageWikiLink Durchmusterung.
• Sigma_Scorpii wikiPageWikiLink Effective_temperature.
• Sigma_Scorpii wikiPageWikiLink Epoch_(astronomy).
• Sigma_Scorpii wikiPageWikiLink File:Rho_Ophiuchi.jpg.
• Sigma_Scorpii wikiPageWikiLink Giant_star.
• Sigma_Scorpii wikiPageWikiLink Gould_Belt.
• Sigma_Scorpii wikiPageWikiLink Henry_Draper_Catalogue.
• Sigma_Scorpii wikiPageWikiLink Hipparcos.
• Sigma_Scorpii wikiPageWikiLink Light-year.
• Sigma_Scorpii wikiPageWikiLink List_of_stars_in_Scorpius.
• Sigma_Scorpii wikiPageWikiLink Main_sequence.
• Sigma_Scorpii wikiPageWikiLink Minute_and_second_of_arc.
• Sigma_Scorpii wikiPageWikiLink Neptune.
• Sigma_Scorpii wikiPageWikiLink Orbital_eccentricity.
• Sigma_Scorpii wikiPageWikiLink Parallax.
• Sigma_Scorpii wikiPageWikiLink Parsec.
• Sigma_Scorpii wikiPageWikiLink Scorpius.
• Sigma_Scorpii wikiPageWikiLink Scorpius–Centaurus_Association.
• Sigma_Scorpii wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
• Sigma_Scorpii wikiPageWikiLink Spectrum.
• Sigma_Scorpii wikiPageWikiLink Star_catalogue.
• Sigma_Scorpii wikiPageWikiLink Star_system.
• Sigma_Scorpii wikiPageWikiLink Stellar_atmosphere.
• Sigma_Scorpii wikiPageWikiLink Stellar_classification.
• Sigma_Scorpii wikiPageWikiLink Stellar_evolution.
• Sigma_Scorpii wikiPageWikiLink Sun.
• Sigma_Scorpii wikiPageWikiLink Tau_Scorpii.
• Sigma_Scorpii wikiPageWikiLink Variable_star.
• Sigma_Scorpii wikiPageWikiLink Wergaia.
• Sigma_Scorpii wikiPageWikiLink File:Cercle_rouge_100%25.svg.
• Sigma_Scorpii wikiPageWikiLink File:Scorpius_IAU.svg.
• Sigma_Scorpii wikiPageWikiLinkText "Al Niyat".
• Sigma_Scorpii wikiPageWikiLinkText "Sigma Scorpii".
• Sigma_Scorpii wikiPageWikiLinkText "σ Sco".
• Sigma_Scorpii wikiPageWikiLinkText "σ Scorpii".
• Sigma_Scorpii wikiPageWikiLinkText "σ".
• Sigma_Scorpii absmagV "/".
• Sigma_Scorpii ageMyr ",".
• Sigma_Scorpii ageMyr "8".
• Sigma_Scorpii appmagV "+2.88".
• Sigma_Scorpii axisUnitless "mas".
• Sigma_Scorpii bV "+0.13".
• Sigma_Scorpii class "B1 III + B1 V".
• Sigma_Scorpii component "σ Sco A".
• Sigma_Scorpii component "σ Sco B".
• Sigma_Scorpii constell Scorpius.
• Sigma_Scorpii epoch Epoch_(astronomy).
• Sigma_Scorpii gravity "3.85".
• Sigma_Scorpii luminosity ",".
• Sigma_Scorpii mass ",".
• Sigma_Scorpii mass "17.2".
• Sigma_Scorpii name "σ Sco B".
• Sigma_Scorpii periastron "MJD".
• Sigma_Scorpii periodUnitless "days".
• Sigma_Scorpii primary "σ Sco A".
• Sigma_Scorpii propMoDec "–16.28".
• Sigma_Scorpii propMoRa "–10.60".
• Sigma_Scorpii radialV "–0.4".
• Sigma_Scorpii radius "11".
• Sigma_Scorpii rotationalVelocity "25".
• Sigma_Scorpii temperature ",".
• Sigma_Scorpii uB "–0.70".
• Sigma_Scorpii wikiPageUsesTemplate Template:DEC.
• Sigma_Scorpii wikiPageUsesTemplate Template:RA.
• Sigma_Scorpii wikiPageUsesTemplate Template:Reflist.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_astrometry.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_begin.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_catalog.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_character.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_detail.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_end.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_image.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_observe.
• Sigma_Scorpii wikiPageUsesTemplate Template:Starbox_orbit.
• Sigma_Scorpii wikiPageUsesTemplate Template:Stars_of_Scorpius.
• Sigma_Scorpii wikiPageUsesTemplate Template:Val.

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