Polaris

E572584

Polaris is the brightest star in the constellation Ursa Minor and the current North Star, lying nearly in line with Earth's rotational axis and serving as a key reference point for navigation in the Northern Hemisphere.

All labels observed (4)

Label Occurrences
Polaris canonical 6
Polaris Ab 2
Polaris B 2

How this entity was disambiguated

Statements (50)

Predicate Object
instanceOf Cepheid variable star ⓘ
North Star ⓘ
star ⓘ
age_millionYears about 70 ⓘ
alsoKnownAs Alpha Ursae Minoris ⓘ
Alruccabah ⓘ
α Ursae Minoris ⓘ
linked to: Alpha Ursae Minoris
angularSeparationFromNorthCelestialPole_degrees less than 1 ⓘ
apparentMagnitude 1.98 ⓘ
colorIndexB−V 0.60 ⓘ
companionStar Polaris Ab ⓘ
linked to: Polaris

Polaris B ⓘ
linked to: Polaris
constellation Ursa Minor ⓘ
declination +89° 15′ 50.8″ ⓘ
distanceFromEarth_ly about 433 ⓘ
distanceFromEarth_pc about 133 ⓘ
eclipticLatitude_degrees about +66 ⓘ
effectiveTemperature_K about 6015 ⓘ
equatorialCoordinatesEpoch J2000.0 ⓘ
galacticPopulation Population I ⓘ
hasRole pole star ⓘ
hemisphereVisibility Northern Hemisphere ⓘ
isBrightestStarOf Ursa Minor ⓘ
isCircumpolarFrom most mid‑northern latitudes ⓘ
isNorthStarSince late Middle Ages ⓘ
locatedIn Milky Way ⓘ
Ursa Minor constellation region ⓘ
linked to: Ursa Minor
luminosity_solarLuminosities about 1260 ⓘ
mass_solarMasses about 5.4 ⓘ
metallicity_FeH about +0.07 ⓘ
nearCelestialPole true ⓘ
orbitalPeriod_PolarisA-Ab_years about 29.6 ⓘ
orbitalPeriod_PolarisA-B_years about 26,000 ⓘ
parallax_mas 7.54 ⓘ
primaryComponent Polaris A ⓘ
linked to: Polaris
pulsationAmplitude_magnitudes about 0.03 ⓘ
pulsationPeriod_days about 3.97 ⓘ
radialVelocity_kmPerSec −17 ⓘ
radius_solarRadii about 37.5 ⓘ
reasonForNorthStarStatus alignment with Earth rotational axis ⓘ
rightAscension 02h 31m 49.09s ⓘ
spectralClass F7Ib ⓘ
systemComponents Polaris A ⓘ
Polaris Ab ⓘ
linked to: Polaris

Polaris B ⓘ
linked to: Polaris
usedFor celestial navigation ⓘ
finding geographic north ⓘ
measuring latitude in Northern Hemisphere ⓘ
variableType Classical Cepheid ⓘ
willNotRemainNorthStar true ⓘ

How these facts were elicited

Referenced by (11)

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

The North Star → namedAfter → Polaris ⓘ
Ursa Minor → containsStar → Polaris ⓘ
Polaris → systemComponents → Polaris Ab ⓘ
linked to: Polaris
Polaris → systemComponents → Polaris B ⓘ
linked to: Polaris
Polaris → primaryComponent → Polaris A ⓘ
linked to: Polaris
Polaris → companionStar → Polaris Ab ⓘ
linked to: Polaris
Polaris → companionStar → Polaris B ⓘ
linked to: Polaris
Northern Dipper → usedToLocate → Polaris ⓘ
North → associatedStar → Polaris ⓘ