|
gptkbp:instanceOf
|
gptkb:star
binary star system
|
|
gptkbp:age
|
0.8 billion years
|
|
gptkbp:apparentMagnitude
|
2.08
+0.77
|
|
gptkbp:BayerDesignation
|
α Ophiuchi
|
|
gptkbp:brightestStar
|
gptkb:Ophiuchus
|
|
gptkbp:catalogueNumber
|
gptkb:FK5_653
gptkb:GC_23810
gptkb:HD_159561
HR 6556
ADS 10408
BD+12 3223
HIP 86032
SAO 102642
WDS J17349+1233
|
|
gptkbp:colorIndexB-V
|
+0.09
+0.15
|
|
gptkbp:companionApparentMagnitude
|
6.0
|
|
gptkbp:companionSpectralType
|
K5V
|
|
gptkbp:constellation
|
gptkb:Ophiuchus
|
|
gptkbp:declination
|
+12° 33′ 36″
|
|
gptkbp:diameter
|
2.7 solar radii
|
|
gptkbp:discoveredBy
|
gptkb:William_Herschel
|
|
gptkbp:discoveredIn
|
1779
|
|
gptkbp:distanceFromEarth
|
48.6 light years
|
|
gptkbp:equatorialCoordinatesEpoch
|
gptkb:J2000
|
|
gptkbp:FlamsteedDesignation
|
gptkb:55_Ophiuchi
|
|
gptkbp:hasCompanion
|
Alpha Ophiuchi B
|
|
gptkbp:hasInfraredExcess
|
no
|
|
gptkbp:hasViewOf
|
gptkb:Northern_Hemisphere
gptkb:Southern_Hemisphere
|
|
gptkbp:hasXrayEmission
|
yes
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Alpha Ophiuchi
|
|
gptkbp:IAUApprovedName
|
gptkb:Rasalhague
|
|
gptkbp:isOblate
|
yes
|
|
gptkbp:isRotationallyFlattened
|
yes
|
|
gptkbp:luminosity
|
25 solar luminosities
|
|
gptkbp:mass
|
2.4 solar masses
|
|
gptkbp:metallicity
|
−0.16 [Fe/H]
|
|
gptkbp:nameMeaning
|
Head of the serpent collector (Arabic origin)
|
|
gptkbp:otherName
|
gptkb:Rasalhague
|
|
gptkbp:parallax
|
67.13 mas
|
|
gptkbp:properMotionRA
|
yes
−234.28 mas/yr
−8.16 mas/yr
|
|
gptkbp:rightAscension
|
17h 34m 56.1s
|
|
gptkbp:rotationPeriod
|
240 km/s
|
|
gptkbp:separationFromCompanion
|
0.4 arcseconds
|
|
gptkbp:spectralType
|
A5III
|
|
gptkbp:temperature
|
8,000 K
|
|
gptkbp:variableStar
|
no
|
|
gptkbp:bfsParent
|
gptkb:Rasalhague
|
|
gptkbp:bfsLayer
|
7
|