Fastrotating neutron stars that emit pulses of radiation.

Entity["Pulsar",name] or

represents an entity of type "Pulsar".


gives the value of a specified property.


gives the value of a list of properties.


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


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


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

Sample Entities

Sample Entity Classes


  • AlphanumericNamealphanumeric name
    AlternateNamesalternate names
    AltitudeMaximumnext maximum altitude
    AltitudeTransitnext transit altitude
    ApparentAltitudeapparent altitude
    AzimuthRiseazimuth at rise
    AzimuthSetazimuth at set
    BarycentricPeriodDerivativerotation period derivative
    BarycentricRotationFrequencybarycentric rotation frequency
    BarycentricRotationFrequencyDerivativebarycentric rotation frequency derivative
    BarycentricRotationFrequencyDerivative2barycentric rotation frequency second derivative
    BinaryPeriodbinary period
    BooleanRiseabove the horizon
    CorrectedPeriodDerivativecorrected period derivative
    DailyTimeAboveHorizondaily time above horizon
    DiscoveryDatediscovery date
    DispersionMeasuredispersion measure
    DispersionMeasureDerivativedispersion measure derivative
    DistanceFromEarthdistance from Earth
    DistanceFromSundistance from Sun
    DMSinbdispersion measure times sin(b)
    Eccentricityorbital eccentricity
    EccentricityTimesCosPeriastronLongitudeeccentricity times cos(periastron longitude)
    EccentricityTimesSinPeriastronLongitudeeccentricity times sin(periastron longitude)
    EnergyFluxAtSunenergy flux measured at Earth
    EntityClassesentity classes
    EntityTypeListentity type list
    EquatorialAngularVelocityequatorial angular velocity
    EquatorialFrequencyequatorial frequency
    GalacticLatitudegalactic latitude
    GalacticLongitudegalactic longitude
    GeocentricEclipticLatitudegeocentric ecliptic latitude
    GeocentricEclipticLongitudegeocentric ecliptic longitude
    GlitchCountglitch count
    GreenwichHourAngleGreenwich hour angle
    HeliocentricEclipticLatitudeheliocentric ecliptic latitude
    HeliocentricEclipticLongitudeheliocentric ecliptic longitude
    HelioCoordinatesheliocentric XYZ coordinates
    LocalHourAnglelocal hour angle
    MagneticFieldAtLightCylindermagnetic field at light cylinder
    MaximalAltitudeTimenext maximum altitude time
    MeanFluxDensityFourHundredMHzmean flux density at 400 MHz
    MeanFluxDensityFourteenHundredMHzmean flux density at 1400 MHz
    MeasuredSpectralIndexmeasured spectral index
    MedianCompanionMassmedian companion mass
    MinimumCompanionMassminimum companion mass
    ObjectTypeobject type
    PeriastronLongitudeperiastron longitude
    PeriodSoundperiod sound
    ProjectedSemimajorAxisLightSecondsprojected semimajor axis
    ProperMotionproper motion
    ProperMotionDeclinationproper motion declination
    ProperMotionRightAscensionproper motion right ascension
    PulsarTypepulsar type
    PulseWidthFiftyPercentPeakpulse width at 50% peak
    PulseWidthTenPercentPeakpulse width at 10% peak
    RadioLuminosityFourHundredMHzradio luminosity at 400 MHz
    RadioLuminosityFourteenHundredMHzradio luminosity at 1400 MHz
    RightAscensionright ascension
    RiseTimenext rise
    RotationMeasurerotation measure
    RotationPeriodrotation period
    SetTimenext set
    SiderealHourAnglesidereal hour angle
    SpinDownAgespin down age
    SpinDownAgeFromCorrectedPeriodDerivativespin down age corrected for proper motion
    SpinDownEnergyLossRatespin down energy loss rate
    SunElongationelongation from the Sun
    SurfaceMagneticDipoleFromCorrectedPeriodDerivativesurface magnetic flux density corrected for proper motion
    SurfaceMagneticFluxDensitysurface magnetic flux density
    TemporalBroadeningtemporal broadening
    TransitTimenext transit time
    TransverseVelocitytransverse velocity
    ZenithAnglezenith angle


  • "Pulsar" entities include a large collection of supernovae from the ATNF Pulsar Catalogue.
  • "Pulsar" entity classes include groups based primarily on radiation emission type, such as radio and high-energy pulsars and anomalous x-ray pulsars.
  • Some properties are available for the "Pulsar" entity type as a whole and can be given using the form EntityValue["Pulsar",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["Pulsar",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.


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Basic Examples  (6)

Use for discovery:

Determine the distance to a pulsar:

Retrieve a dataset of all available properties for an entity:

Find the pulsars with a rotation period of less than 3 milliseconds:

Find the equatorial coordinates of a pulsar:

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

Scope  (4)

Implicit Entity Classes  (1)

Represent all of the pulsars with a rotation period of less than 3 milliseconds:

Get a list of all the pulsars:

Property Classes  (1)

Represent equatorial coordinate properties associated with pulsars:

Get a list of available property classes for pulsars:

Find the list of properties included in a property class:

Obtain the property values for the properties in a property class for an entity:

Qualifiers  (2)

Some properties accept qualifiers:

The "Location" qualifier, which specifies the location of the observer, can accept an explicit GeoPosition, location-based Entity objects or queries that evaluate to one of these:

Dates  (1)

Date qualifiers can accept an explicit DateObject or queries that evaluate to a DateObject:

Date qualifiers can also be specified using Dated: