Alpha Ophiuchi

E479081
A-type subgiant star binary star system star

Alpha Ophiuchi, traditionally known as Rasalhague, is the brightest star in the constellation Ophiuchus and a rapidly rotating A-type subgiant located relatively close to Earth.

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Observed surface forms (1)

Surface form Occurrences
Alpha Ophiuchi B 0

Statements (47)

Predicate Object
instanceOf A-type subgiant star ⓘ
binary star system ⓘ
star ⓘ
star ⓘ
hasAge_billionYears 0.8 ⓘ
hasAlternativeName 55 Ophiuchi NERFINISHED ⓘ
hasApparentMagnitude 2.07 ⓘ
hasBayerDesignation Alpha Ophiuchi NERFINISHED ⓘ
α Ophiuchi NERFINISHED ⓘ
hasColorIndexBMinusV 0.16 ⓘ
hasCompanion Alpha Ophiuchi B NERFINISHED ⓘ
hasConstellationAbbreviation Oph NERFINISHED ⓘ
hasDeclination +12° 33′ 36″ ⓘ
hasDistanceFromEarth_ly 48.6 ⓘ
hasDistanceFromEarth_pc 14.9 ⓘ
hasEffectiveTemperature_K 8000 ⓘ
hasEquinox J2000.0 ⓘ
hasFlamsteedDesignation 55 Ophiuchi NERFINISHED ⓘ
hasGalacticLatitude_deg +22.4 ⓘ
hasGalacticLongitude_deg 35.9 ⓘ
hasHDDesignation HD 159561 NERFINISHED ⓘ
hasHIPDesignation HIP 86032 NERFINISHED ⓘ
hasHRDesignation HR 6556 NERFINISHED ⓘ
hasIAUName Rasalhague NERFINISHED ⓘ
hasLuminosity_solarLuminosity 25 ⓘ
hasMass_solarMass 2.4 ⓘ
hasMetallicity_FeH -0.1 ⓘ
hasNameEtymology Arabic for "head of the serpent collector" ⓘ
hasOblateness significant ⓘ
hasOrbitalPeriod_years 8.62 ⓘ
hasParallax_mas 67.1 ⓘ
hasProjectedRotationalVelocity_kmPerS 240 ⓘ
hasProperMotionDec_masPerYear -222.0 ⓘ
hasProperMotionRA_masPerYear -109.3 ⓘ
hasRadialVelocity_kmPerS -12 ⓘ
hasRadius_solarRadius 2.9 ⓘ
hasRightAscension 17h 34m 56.0s ⓘ
hasSpectralType A5IV ⓘ
K-type main-sequence star ⓘ
hasSurfaceGravity_logg 3.9 ⓘ
hasTraditionalName Rasalhague NERFINISHED ⓘ
hasVariableStatus non-variable ⓘ
isBrightestStarIn Ophiuchus NERFINISHED ⓘ
isInConstellation Ophiuchus NERFINISHED ⓘ
isPartOfAsterism Ophiuchus figure ⓘ
isRapidRotator true ⓘ
isVisibleToNakedEye true ⓘ

Referenced by (1)

Full triples — surface form annotated when it differs from this entity's canonical label.

Ophiuchus → BayerDesignation → Alpha Ophiuchi ⓘ
subject surface form: Rasalhague