Alpha Eridani
E554800
Alpha Eridani, traditionally known as Achernar, is a bright, rapidly rotating blue-white star marking the southern end of the constellation Eridanus.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Alpha Eridani B | 0 |
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
main-sequence star
ⓘ
star ⓘ |
| age_Myr | about 37 ⓘ |
| apparentMagnitudeV | 0.46 ⓘ |
| belongsToAsterism | Eridanus (river) pattern ⓘ |
| belongsToHemisphere | southern celestial hemisphere ⓘ |
| catalogIdentifier |
FK5 45
NERFINISHED
ⓘ
HD 10144 NERFINISHED ⓘ HIP 7588 NERFINISHED ⓘ HR 472 NERFINISHED ⓘ |
| color | blue-white ⓘ |
| declination | −57° 14′ 12″ ⓘ |
| distanceFromEarth_ly | about 139 ⓘ |
| distanceFromEarth_pc | about 42.9 ⓘ |
| effectiveTemperature_K | about 15,000 ⓘ |
| equatorialCoordinatesEpoch | J2000 ⓘ |
| equatorialToPolarRadiusRatio | about 1.5 ⓘ |
| hasBayerDesignation | α Eridani NERFINISHED ⓘ |
| hasCircumstellarDisk | yes ⓘ |
| hasCompanion | Alpha Eridani B NERFINISHED ⓘ |
| hasPhotometricBand | V-band magnitude 0.46 ⓘ |
| hasTraditionalName | Achernar NERFINISHED ⓘ |
| IAUName | Achernar NERFINISHED ⓘ |
| isAmong | brightest stars in the night sky ⓘ |
| isIAUApprovedStarName | yes ⓘ |
| locatedInConstellation | Eridanus NERFINISHED ⓘ |
| luminosity_solar | about 3,150 ⓘ |
| marksFeature | southern end of the constellation Eridanus ⓘ |
| mass_solar | about 6.7 ⓘ |
| metallicity_FeH | approximately solar ⓘ |
| nameOrigin | derived from Arabic "Ākhir an-nahr" meaning "End of the River" ⓘ |
| orbitalPeriodOfCompanion_years | about 14–15 ⓘ |
| parallax_mas | 23.39 ⓘ |
| properMotionDec_masPerYr | −40.08 ⓘ |
| properMotionRA_masPerYr | +88.02 ⓘ |
| radialVelocity_kmPerSec | +16.7 ⓘ |
| radius_solar | about 7.3 (equatorial) ⓘ |
| rightAscension | 01h 37m 42.8s ⓘ |
| rotationalVelocity_kmPerSec | about 250 ⓘ |
| rotationCharacteristic | rapidly rotating ⓘ |
| shape | highly oblate ⓘ |
| spectralType |
A-type main-sequence star
ⓘ
B6 Vep ⓘ |
| systemType | binary ⓘ |
| variabilityType | Be star characteristics ⓘ |
| visibility | not visible from most of the Northern Hemisphere ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Achernar