Altair

E572585

Altair is a bright, nearby A-type main-sequence star in the constellation Aquila and one of the three stars forming the prominent Summer Triangle asterism.

All labels observed (1)

Label Occurrences
Altair canonical 11

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf A-type main-sequence star
rapidly rotating star
star
age_Gyr 1.2
apparentMagnitudeV 0.77
bayerDesignation Alpha Aquilae
belongsToAsterism Summer Triangle
linked to: SummerTriangle
colorIndexBMinusV 0.22
constellation Aquila
declination_J2000 +08°52′06″
distanceFromEarth_ly 16.7
distanceFromEarth_pc 5.13
effectiveTemperature_K 7550
equatorialCoordinatesEpoch J2000.0
equatorialToPolarRadiusRatio ~1.25
flamsteedDesignation 53 Aquilae
galacticPopulation thin disk
hasExoplanetsDetected no confirmed planets as of 2024
hasProperName Altair
hdNumber HD 187642
hemisphereProminence northern summer sky
hipparcosNumber HIP 97649
hrNumber HR 7557
isBrightStar true
luminosity_solar 10.6
mass_solar 1.8
metallicity_FeH −0.24
nameEtymology from Arabic "al-nasr al-ṭāʼir" meaning "the flying eagle"
notableFeature first main-sequence star whose surface was imaged interferometrically
oblateness significant
observedBy CHARA Array
Hipparcos satellite
Very Large Telescope Interferometer
otherComponentOf Deneb
Summer Triangle
linked to: SummerTriangle

Vega
partOf Summer Triangle
linked to: SummerTriangle
projectedRotationalVelocity_kmPerS ~240
radius_solar_equatorial 1.9
radius_solar_polar 1.6
rankByBrightness among 20 brightest stars in night sky
rightAscension_J2000 19h50m47s
rotationPeriod_hours ~9
spectralType A7 V
traditionalAssociation Eagle
variabilityType mild, not a major variable star
visibleFrom Northern Hemisphere
Southern Hemisphere

How these facts were elicited

Referenced by (11)

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