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.
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Cepheid variable star
ⓘ
North Star ⓘ star ⓘ |
| age_millionYears | about 70 ⓘ |
| alsoKnownAs |
Alpha Ursae Minoris
NERFINISHED
ⓘ
Alruccabah NERFINISHED ⓘ α Ursae Minoris NERFINISHED ⓘ |
| angularSeparationFromNorthCelestialPole_degrees | less than 1 ⓘ |
| apparentMagnitude | 1.98 ⓘ |
| colorIndexB−V | 0.60 ⓘ |
| companionStar |
Polaris Ab
NERFINISHED
ⓘ
Polaris B NERFINISHED ⓘ |
| constellation | Ursa Minor NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| isBrightestStarOf | Ursa Minor NERFINISHED ⓘ |
| isCircumpolarFrom | most mid‑northern latitudes ⓘ |
| isNorthStarSince | late Middle Ages ⓘ |
| locatedIn |
Milky Way
ⓘ
Ursa Minor constellation region NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| 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
NERFINISHED
ⓘ
Polaris Ab NERFINISHED ⓘ Polaris B NERFINISHED ⓘ |
| usedFor |
celestial navigation
ⓘ
finding geographic north ⓘ measuring latitude in Northern Hemisphere ⓘ |
| variableType | Classical Cepheid ⓘ |
| willNotRemainNorthStar | true ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.