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gptkbp:instanceOf
|
binary star system
|
|
gptkbp:apparentMagnitude
|
1.98
|
|
gptkbp:brightestStar
|
gptkb:Polaris_Aa
|
|
gptkbp:catalogueNumber
|
gptkb:GC_2243
gptkb:HR_424
gptkb:2MASS_J02314909+8915055
gptkb:AAVSO_0229+88
gptkb:FK5_15
gptkb:GSC_04664-00259
gptkb:TYC_4664-259-1
gptkb:BD+88_8
gptkb:HD_8890
gptkb:HIP_11767
gptkb:SAO_308
gptkb:WDS_J02318+8915
gptkb:ADS_1477
|
|
gptkbp:contains
|
gptkb:Polaris_B
gptkb:Polaris_Aa
Polaris Ab
|
|
gptkbp:declination
|
+89° 15′ 50.8″
|
|
gptkbp:discoveredBy
|
gptkb:William_Herschel_(Polaris_B,_1780)
|
|
gptkbp:distanceFromEarth
|
about 433 light-years
|
|
gptkbp:epoch
|
gptkb:J2000
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Polaris system
|
|
gptkbp:locatedIn
|
constellation Ursa Minor
|
|
gptkbp:mass_(Polaris_Aa)
|
about 5.4 solar masses
|
|
gptkbp:mass_(Polaris_Ab)
|
about 1.26 solar masses
|
|
gptkbp:mass_(Polaris_B)
|
about 1.39 solar masses
|
|
gptkbp:metallicity_(Polaris_Aa)
|
[Fe/H] ≈ 0.07
|
|
gptkbp:notableFor
|
current northern pole star
|
|
gptkbp:orbitalPeriod_(Aa-Ab)
|
about 29.6 years
|
|
gptkbp:orbitalPeriod_(Aa-B)
|
about 18,000 years
|
|
gptkbp:otherName
|
gptkb:Nord
gptkb:Alpha_Ursae_Minoris
gptkb:Pole_Star
|
|
gptkbp:parallax
|
7.54 mas
|
|
gptkbp:Polaris_Aa
|
variable star
|
|
gptkbp:Polaris_Ab
|
stellar classification
|
|
gptkbp:Polaris_B
|
F3V main-sequence star
|
|
gptkbp:properMotionRA
|
-11.74 mas/yr
44.22 mas/yr
|
|
gptkbp:radialVelocity
|
-16.6 km/s
|
|
gptkbp:rightAscension
|
02h 31m 49.09s
|
|
gptkbp:spectralType
|
F7:Ib (Polaris Aa)
|
|
gptkbp:usedFor
|
gptkb:navigation
|
|
gptkbp:variabilityPeriod
|
about 3.97 days
|
|
gptkbp:variableType
|
gptkb:Classical_Cepheid
|
|
gptkbp:bfsParent
|
gptkb:William_Herschel_(Polaris_B,_1780)
gptkb:Polaris_B
|
|
gptkbp:bfsLayer
|
6
|