Stars from a variety of wellknown catalogs.

Entity["Star",name] or

represents an entity of type "Star".

[prop]

gives the value of a specified property.

[{prop1,}]

gives the value of a list of properties.

[prop,{qualivali,}]

gives the value of a specified property modified by qualifier rules quali->vali.

[Dated[prop,date]]

gives the value of a property associated with a particular date specification.

EntityClass["Star",{propispeci,}]

represents a class of entities with values of propi defined by speci.

Sample Entities

Sample Entity Classes

Properties

  • AbsoluteMagnitudeabsolute magnitude
    Ageage
    AlphanumericNamealphanumeric name
    AlternateNamesalternate names
    Altitudealtitude
    AltitudeTransitnext transit altitude
    Apoapsislargest distance from orbit center
    ApparentAltitudeapparent altitude
    ApparentMagnitudeapparent magnitude
    Azimuthazimuth
    AzimuthRiseazimuth at rise
    AzimuthSetazimuth at set
    BayerNameBayer name
    BayerStandardNameBayer standard name
    BooleanRiseabove the horizon
    BVColorIndexBV color index
    Classesclasses
    Colorcolor
    Componentcomponent
    Constellationconstellation
    DailyTimeAboveHorizondaily time above horizon
    Declinationdeclination
    Densitymean density
    Diameteraverage diameter
    DistanceFromEarthdistance from Earth
    DistanceFromSundistance from Sun
    DurchmusterungNameDurchmusterung name
    DurchmusterungStandardNameDurchmusterung standard name
    Eccentricityorbital eccentricity
    EffectiveTemperatureeffective temperature
    EquatorialDiameterequatorial diameter
    EquatorialRadiusequatorial radius
    EscapeVelocityescape velocity
    FlamsteedNameFlamsteed name
    FlamsteedStandardNameFlamsteed standard name
    GalacticLatitudegalactic latitude
    GalacticLongitudegalactic longitude
    GlieseNameGliese catalog designation
    GlieseStandardNameGliese standard name
    Glyphastrological symbol
    GravitationalConstantMassProductgravitational constant mass product
    Gravitygravity
    GreenwichHourAngleGreenwich hour angle
    HDNameHD catalog name
    HDNumberHD catalog number
    HelioCoordinatesheliocentric XYZ coordinates
    HipparcosNameHipparcos name
    HipparcosNumberHipparcos number
    HRNameHR catalog name
    HRNumberHR catalog number
    ICNumberIC number
    Imageimage
    LifetimeEntropylifetime entropy
    LocalHourAnglelocal hour angle
    Luminosityluminosity
    MainSequenceLifetimemain sequence lifetime
    MajorAxisorbital major axis
    Massmass
    MaximalAltitudeTimenext maximum altitude time
    MaximumAbsoluteMagnitudemaximum absolute magnitude
    MaximumApparentMagnitudemaximum apparent magnitude
    Metallicitymetallicity
    MinimumAbsoluteMagnitudeminimum absolute magnitude
    MinimumApparentMagnitudeminimum apparent magnitude
    MomentOfInertiarotational moment of inertia
    MultipleSystemMembermember of a multiple star system
    Namename
    NGCNumberNGC number
    ObjectTypeobject type
    Oblatenessoblateness
    Obliquityobliquity
    OrbitCenterorbit center
    OrbitPeriodorbital period
    Parallaxparallax
    Periapsisnearest distance from orbit center
    PolarDiameterpolar diameter
    PolarRadiuspolar radius
    PositionAngleposition angle
    ProperMotionproper motion
    ProperMotionDeclinationproper motion declination
    ProperMotionRightAscensionproper motion right ascension
    RadialVelocityradial velocity
    Radiusaverage radius
    RightAscensionright ascension
    RiseTimenext rise
    RotationPeriodrotation period
    SAONameSAO catalog name
    SAONumberSAO catalog number
    Satellitesknown satellites
    SemimajorAxisorbital semimajor axis
    Separationseparation
    SetTimenext set
    Shapeshape
    SiderealHourAnglesidereal hour angle
    SpectralClassspectral class
    SpectralClassListspectral class list
    StarDistanceTimeSeriesdistance from Earth time series
    StarEndStatestellar end state
    StarTypestar type
    StationaryOrbitRadiusstationary orbit radius
    StationaryOrbitSpeedstationary orbit speed
    StellarEvolutionDiagramstellar evolution diagram
    SunElongationelongation from the Sun
    SurfaceAreasurface area
    SystemMemberssystem members
    TransitTimenext transit time
    TychoNumberTycho number
    VariablePeriodvariability period
    VariableStarNamevariable star name
    VariableStarTypevariable star type
    Volumevolume
    WDSIdentifierWDS identifier

Details

  • "Star" entities include a large collection of stellar objects from a variety of catalogs, including subsets of the Yale Bright Star Catalog, the Hipparcos Catalogue, the Henry Draper Catalogue and the Gliese Catalogue.
  • "Star" entity classes include a large variety of groups based on aspects such as spectral types, chemical compositions, variable star types, constellation membership and catalog membership.
  • Some properties are available for the "Star" entity type as a whole and can be given using the form EntityValue["Star",property]. Such properties include:
  • "Properties"the list of available properties
    "PropertyCanonicalNames"the standard names of available properties
    "SampleEntities"a sample list of available entities (typically of length 10)
    "SampleEntityClasses"a sample list of available entity classes (typically of length 10)
    "EntityCount"number of entities available
    "Entities"the list of available entities
    "EntityCanonicalNames"the standard names of available entities
    "EntityClasses"the list of available entity classes
    "EntityClassCanonicalNames"the standard names of available entity classes
    "PropertyClasses"the list of available property classes
    "PropertyClassCanonicalNames"the standard names of available property classes
    "PropertyCount"number of properties available
  • The following annotations can be used in the third argument of EntityValue["Star",property,annotation]:
  • "Source"source information for the property
    "Date"the date associated with the entity-property value (if any)
    "EntityAssociation"an association of entities and entity-property values
    "PropertyAssociation"an association of properties and entity-property values
    "EntityPropertyAssociation"an association in which the specified entities are keys, and values are a nested association of properties and entity-property values
    "PropertyEntityAssociation"an association in which the specified properties are keys, and values are a nested association of entities and entity-property values
    "Dataset"a dataset in which the specified entities are keys, and values are an association of property names and entity-property values
  • The following annotations can be used in the second argument of EntityValue[property,annotation]:
  • "Qualifiers"the list of possible qualifiers for the property
    "QualifierValues"the list of possible values that can be given to each qualifier
    "DefaultQualifierValues"the list of default values for the property's qualifiers
    "Description"a brief textual description of the property
    "Definition"a detailed textual definition of the property
    "PhysicalQuantity"the physical quantity associated with the entity-property value
    "Unit"the unit associated with the entity-property value
  • A qualifier value of Automatic indicates that an applicable format of values can be used; e.g. for the "Date" qualifier, this includes a proper date or date span.

Examples

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Basic Examples  (8)

Use for discovery:

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Find the effective temperature of a star:

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Find the equatorial coordinates of a star:

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Find the current sky position of a star from your location:

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Get a list of classes of stars:

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Find the spectral classes of barium stars:

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Retrieve a dataset of all available properties for an entity:

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Find the 5 brightest stars:

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Scope  (14)

Applications  (10)

Relations to Other Entity Types  (1)

Neat Examples  (1)