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- Alpha_Ophiuchi abstract "Alpha Ophiuchi (α Oph, α Ophiuchi) is the brightest star in the constellation Ophiuchus. It has the traditional name Ras Alhague, often condensed to Rasalhague.Alpha Ophiuchi is a binary star system with an orbital period of about 8.62 years. The orbital parameters were only poorly known until 2011 when observations using adaptive optics produced a better orbital fit, allowing the individual masses of the two components to be determined. The primary component, Alpha Ophiuchi A, has a mass of about 2.4 times the mass of the Sun, while the secondary, Alpha Ophiuchi B, has 0.85 solar masses. Estimates of the mass of the primary by other means range from a low of 1.92 to 2.10 solar masses, up to 2.84 or even 4.8 solar masses. The mass of the secondary suggests that it has a stellar classification in the range K5V to K7V, which indicates it is a main sequence star that is still generating energy by the thermonuclear fusion of hydrogen at its core. The pair reached periastron passage, or closest approach, around April 19, 2012, when they had an angular separation of 50 milliarcseconds.This star system has a combined apparent magnitude of +2.08 and is located at a distance of about 48.6 light-years (14.9 parsecs) from the Earth. The stellar classification of A5 III indicates that the primary is a giant star that has evolved away from the main sequence after consuming the hydrogen at its core. It is radiating about 25 times the luminosity of the Sun and has an effective temperature of about 8,000 K, giving it the characteristic white hue of an A-type star.Alpha Ophiuchi A is a rapidly rotating star with a projected rotational velocity of 240 km s-1. It is spinning at a rate of about 88.5% of the velocity that would cause the star to break up. The resulting equatorial bulge is about 20% larger than the polar radius, giving the star the shape of an oblate spheroid. Because of this distorted shape, the poles have an effective temperature about 1,840 K greater than along the equator. The axis of rotation of the star is inclined about 87.°7 ± 0°4 to the line of sight from the Earth, so that it is being observed from nearly equator-on.The spectrum of Alpha Ophiuchi shows an anomalously high level of absorption of the lines for singly-ionized calcium (Ca II). However, this is likely the result of interstellar matter between the Earth and the star, rather than a property of the star or circumstellar dust.".
- Alpha_Ophiuchi thumbnail Ophiuchus_IAU.svg?width=300.
- Alpha_Ophiuchi wikiPageExternalLink rasalhague.html.
- Alpha_Ophiuchi wikiPageID "1522419".
- Alpha_Ophiuchi wikiPageRevisionID "605419677".
- Alpha_Ophiuchi absmagV "1.3".
- Alpha_Ophiuchi appmagV "2.07".
- Alpha_Ophiuchi axisUnitless "427".
- Alpha_Ophiuchi bV "+0.15".
- Alpha_Ophiuchi class "A5 III / K5–7 V".
- Alpha_Ophiuchi component "α Oph A".
- Alpha_Ophiuchi component "α Oph B".
- Alpha_Ophiuchi constell Ophiuchus.
- Alpha_Ophiuchi epoch "J2000".
- Alpha_Ophiuchi gravity "3.91".
- Alpha_Ophiuchi hasPhotoCollection Alpha_Ophiuchi.
- Alpha_Ophiuchi inclination "125".
- Alpha_Ophiuchi luminosity "25.1".
- Alpha_Ophiuchi mass "0.85".
- Alpha_Ophiuchi mass "2.4".
- Alpha_Ophiuchi pError "1.06".
- Alpha_Ophiuchi parallax "67.13".
- Alpha_Ophiuchi periodUnitless "2.7202176E8".
- Alpha_Ophiuchi propMoDec "-221.57".
- Alpha_Ophiuchi propMoRa "108.07".
- Alpha_Ophiuchi radialV "+12.6".
- Alpha_Ophiuchi radius "2.6".
- Alpha_Ophiuchi rotationalVelocity "240".
- Alpha_Ophiuchi temperature "7880".
- Alpha_Ophiuchi uB "+0.10".
- Alpha_Ophiuchi subject Category:A-type_giants.
- Alpha_Ophiuchi subject Category:Bayer_objects.
- Alpha_Ophiuchi subject Category:Objects_within_100_ly_of_Earth.
- Alpha_Ophiuchi subject Category:Ophiuchus_(constellation).
- Alpha_Ophiuchi subject Category:Stars_with_proper_names.
- Alpha_Ophiuchi type A-typeGiants.
- Alpha_Ophiuchi type Animal100015388.
- Alpha_Ophiuchi type BayerObjects.
- Alpha_Ophiuchi type CelestialBody109239740.
- Alpha_Ophiuchi type Giant101323781.
- Alpha_Ophiuchi type LivingThing100004258.
- Alpha_Ophiuchi type NaturalObject100019128.
- Alpha_Ophiuchi type Object100002684.
- Alpha_Ophiuchi type Organism100004475.
- Alpha_Ophiuchi type PhysicalEntity100001930.
- Alpha_Ophiuchi type Star109444100.
- Alpha_Ophiuchi type StarsWithProperNames.
- Alpha_Ophiuchi type Whole100003553.
- Alpha_Ophiuchi type CelestialBody.
- Alpha_Ophiuchi type Star.
- Alpha_Ophiuchi type PhysicalBody.
- Alpha_Ophiuchi comment "Alpha Ophiuchi (α Oph, α Ophiuchi) is the brightest star in the constellation Ophiuchus. It has the traditional name Ras Alhague, often condensed to Rasalhague.Alpha Ophiuchi is a binary star system with an orbital period of about 8.62 years. The orbital parameters were only poorly known until 2011 when observations using adaptive optics produced a better orbital fit, allowing the individual masses of the two components to be determined.".
- Alpha_Ophiuchi label "Alfa Ophiuchi".
- Alpha_Ophiuchi label "Alpha Ophiuchi".
- Alpha_Ophiuchi label "Alpha Ophiuchi".
- Alpha_Ophiuchi label "Alpha Ophiuchi".
- Alpha_Ophiuchi label "Ras Alhague".
- Alpha_Ophiuchi label "Ras Alhague".
- Alpha_Ophiuchi label "Rasalhague".
- Alpha_Ophiuchi label "Rasalhague".
- Alpha_Ophiuchi label "Рас Альхаге".
- Alpha_Ophiuchi label "رأس الحواء".
- Alpha_Ophiuchi label "へびつかい座アルファ星".
- Alpha_Ophiuchi label "蛇夫座α".
- Alpha_Ophiuchi sameAs Ras_Alhague.
- Alpha_Ophiuchi sameAs Ρας_Αλχάγκ.
- Alpha_Ophiuchi sameAs Ras_Alhague.
- Alpha_Ophiuchi sameAs Alpha_Ophiuchi.
- Alpha_Ophiuchi sameAs Alpha_Ophiuchi.
- Alpha_Ophiuchi sameAs Alfa_Ophiuchi.
- Alpha_Ophiuchi sameAs へびつかい座アルファ星.
- Alpha_Ophiuchi sameAs 라스_알하게.
- Alpha_Ophiuchi sameAs Rasalhague.
- Alpha_Ophiuchi sameAs Rasalhague.
- Alpha_Ophiuchi sameAs Alpha_Ophiuchi.
- Alpha_Ophiuchi sameAs m.057sfc.
- Alpha_Ophiuchi sameAs Q13504.
- Alpha_Ophiuchi sameAs Q13504.
- Alpha_Ophiuchi sameAs Alpha_Ophiuchi.
- Alpha_Ophiuchi wasDerivedFrom Alpha_Ophiuchi?oldid=605419677.
- Alpha_Ophiuchi depiction Ophiuchus_IAU.svg.
- Alpha_Ophiuchi isPrimaryTopicOf Alpha_Ophiuchi.
- Alpha_Ophiuchi name "Alpha Ophiuchi".