Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Sigma_Scorpii> ?p ?o. }
Showing items 1 to 90 of
90
with 100 items per page.
- 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 568+75−59 light years (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 29,000 times the luminosity of the Sun from its outer envelope at an effective temperature of 26,150 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 0.2468429, 0.239671, and 8.2 days. During each pulsation cycle, the temperature of the star varies by 4,000 ± 2,000 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 wikiPageRevisionID "601551138".
- Sigma_Scorpii ageMyr ",".
- Sigma_Scorpii appmagV "+2.88".
- Sigma_Scorpii axisUnitless "3.62".
- 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 distLy "568".
- Sigma_Scorpii distPc "174".
- Sigma_Scorpii eccentricity "0.322".
- Sigma_Scorpii epoch Epoch_(astronomy).
- Sigma_Scorpii gravity "3.85".
- Sigma_Scorpii hasPhotoCollection Sigma_Scorpii.
- Sigma_Scorpii inclination "158.2".
- Sigma_Scorpii luminosity ",".
- Sigma_Scorpii mass ",".
- Sigma_Scorpii name "σ Sco B".
- Sigma_Scorpii node "104".
- Sigma_Scorpii periarg "283".
- Sigma_Scorpii periastron "34889".
- 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 subject Category:B-type_giants.
- Sigma_Scorpii subject Category:B-type_main-sequence_stars.
- Sigma_Scorpii subject Category:Bayer_objects.
- Sigma_Scorpii subject Category:Beta_Cephei_variables.
- Sigma_Scorpii subject Category:Flamsteed_objects.
- Sigma_Scorpii subject Category:Multiple_star_systems.
- Sigma_Scorpii subject Category:Scorpius_(constellation).
- Sigma_Scorpii subject Category:Stars_with_proper_names.
- Sigma_Scorpii type Animal100015388.
- Sigma_Scorpii type B-typeGiants.
- Sigma_Scorpii type B-typeMainSequenceStars.
- Sigma_Scorpii type BayerObjects.
- Sigma_Scorpii type BetaCepheiVariables.
- Sigma_Scorpii type BinaryStar109221070.
- Sigma_Scorpii type CelestialBody109239740.
- Sigma_Scorpii type EclipsingBinaries.
- Sigma_Scorpii type FlamsteedObjects.
- Sigma_Scorpii type Giant101323781.
- Sigma_Scorpii type LivingThing100004258.
- Sigma_Scorpii type NaturalObject100019128.
- Sigma_Scorpii type Object100002684.
- Sigma_Scorpii type Organism100004475.
- Sigma_Scorpii type PhysicalEntity100001930.
- Sigma_Scorpii type Star109444100.
- Sigma_Scorpii type StarsWithProperNames.
- Sigma_Scorpii type Thing100002452.
- Sigma_Scorpii type Variable109468959.
- Sigma_Scorpii type Whole100003553.
- Sigma_Scorpii type CelestialBody.
- Sigma_Scorpii type Star.
- Sigma_Scorpii type PhysicalBody.
- Sigma_Scorpii comment "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.".
- Sigma_Scorpii label "Al Niyat".
- Sigma_Scorpii label "Alniyat".
- Sigma_Scorpii label "Sigma Scorpii".
- Sigma_Scorpii label "Sigma Scorpii".
- Sigma_Scorpii label "Sigma Scorpii".
- Sigma_Scorpii label "Sigma Scorpii".
- Sigma_Scorpii label "Sigma Scorpii".
- Sigma_Scorpii label "Сигма Скорпиона".
- Sigma_Scorpii label "さそり座シグマ星".
- Sigma_Scorpii label "心宿一".
- Sigma_Scorpii sameAs Sigma_Scorpii.
- Sigma_Scorpii sameAs Al_Niyat.
- Sigma_Scorpii sameAs Sigma_Scorpii.
- Sigma_Scorpii sameAs Sigma_Scorpii.
- Sigma_Scorpii sameAs さそり座シグマ星.
- Sigma_Scorpii sameAs Alniyat.
- Sigma_Scorpii sameAs Sigma_Scorpii.
- Sigma_Scorpii sameAs m.06xbyt.
- Sigma_Scorpii sameAs Q1036361.
- Sigma_Scorpii sameAs Q1036361.
- Sigma_Scorpii sameAs Sigma_Scorpii.
- Sigma_Scorpii wasDerivedFrom Sigma_Scorpii?oldid=601551138.
- Sigma_Scorpii depiction Scorpius_IAU.svg.
- Sigma_Scorpii isPrimaryTopicOf Sigma_Scorpii.
- Sigma_Scorpii name "Sigma Scorpii".