|
gptkbp:instanceOf
|
gptkb:star
|
|
gptkbp:age
|
300 million years
|
|
gptkbp:apparentMagnitude
|
3.65
-1.20
|
|
gptkbp:BayerDesignation
|
gptkb:Alpha_Draconis
|
|
gptkbp:binarySystem
|
true
|
|
gptkbp:catalogueNumber
|
gptkb:BD+65_879
gptkb:HD_123299
gptkb:HIP_68756
gptkb:HR_5291
gptkb:SAO_16576
|
|
gptkbp:companionApparentMagnitude
|
5.5
|
|
gptkbp:companionSpectralType
|
A2V
|
|
gptkbp:constellation
|
gptkb:Draco
|
|
gptkbp:declination
|
+64° 22′ 33.6″
|
|
gptkbp:diameter
|
3.4 solar radii
|
|
gptkbp:discoveredBy
|
ancient astronomers
|
|
gptkbp:distanceFromEarth
|
303 light years
|
|
gptkbp:eccentricity
|
0.43
|
|
gptkbp:epoch
|
gptkb:J2000
|
|
gptkbp:FlamsteedDesignation
|
gptkb:11_Draconis
|
|
gptkbp:galacticLatitude
|
+53.5°
104.9°
|
|
gptkbp:hasCompanion
|
gptkb:Thuban_B
|
|
gptkbp:hasViewOf
|
gptkb:Northern_Hemisphere
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Thuban
|
|
gptkbp:IAUApprovedName
|
gptkb:Thuban
|
|
gptkbp:luminosity
|
250 times Sun
|
|
gptkbp:mass
|
2.8 solar masses
|
|
gptkbp:metallicity
|
-0.02
|
|
gptkbp:nameMeaning
|
the dragon
|
|
gptkbp:notableFor
|
former pole star
|
|
gptkbp:orbitType
|
51.4 days
|
|
gptkbp:otherName
|
gptkb:Alpha_Draconis
|
|
gptkbp:parallax
|
0.12 mas
10.76 mas
|
|
gptkbp:poleStarPeriod
|
c. 3942 BC to 1793 BC
|
|
gptkbp:properMotionRA
|
-17.34 mas/yr
-22.93 mas/yr
|
|
gptkbp:rightAscension
|
14h 04m 23.35s
|
|
gptkbp:rotationPeriod
|
25 km/s
|
|
gptkbp:separationFromCompanion
|
0.46 AU
|
|
gptkbp:SIMBADID
|
alf+dra
|
|
gptkbp:spectralType
|
A0III
|
|
gptkbp:temperature
|
10,100 K
|
|
gptkbp:variableStar
|
no
|
|
gptkbp:visibilitySeason
|
gptkb:spring
|
|
gptkbp:wasPoleStar
|
true
|
|
gptkbp:bfsParent
|
gptkb:The_North_Star
gptkb:Draco
|
|
gptkbp:bfsLayer
|
5
|