Pulsar
Pulsar
Related Interpreter »Fast‐rotating neutron stars that emit pulses of radiation.
[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["Pulsar",{propispeci,…}]
represents a class of entities with values of propi defined by speci.
Sample Entities
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Sample Entity Classes
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Properties
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AlphanumericName alphanumeric name AlternateNames alternate names Altitude altitude AltitudeMaximum next maximum altitude AltitudeTransit next transit altitude ApparentAltitude apparent altitude AstroPosition AstroPosition Azimuth azimuth AzimuthRise azimuth at rise AzimuthSet azimuth at set BarycentricPeriodDerivative rotation period derivative BarycentricRotationFrequency barycentric rotation frequency BarycentricRotationFrequencyDerivative barycentric rotation frequency derivative BarycentricRotationFrequencyDerivative2 barycentric rotation frequency second derivative BinaryPeriod binary period BooleanRise above the horizon Classes classes Constellation constellation CorrectedPeriodDerivative corrected period derivative DailyTimeAboveHorizon daily time above horizon Declination declination DiscoveryDate discovery date DispersionMeasure dispersion measure DispersionMeasureDerivative dispersion measure derivative DistanceFromEarth distance from Earth DistanceFromSun distance from Sun DMSinb dispersion measure times sin(b) Eccentricity orbital eccentricity EccentricityTimesCosPeriastronLongitude eccentricity times cos(periastron longitude) EccentricityTimesSinPeriastronLongitude eccentricity times sin(periastron longitude) EnergyFluxAtSun energy flux measured at Earth EntityClasses entity classes EntityTypeList entity type list EquatorialAngularVelocity equatorial angular velocity EquatorialFrequency equatorial frequency GalacticLatitude galactic latitude GalacticLongitude galactic longitude GeocentricEclipticLatitude geocentric ecliptic latitude GeocentricEclipticLongitude geocentric ecliptic longitude GlitchCount glitch count GreenwichHourAngle Greenwich hour angle HeliocentricEclipticLatitude heliocentric ecliptic latitude HeliocentricEclipticLongitude heliocentric ecliptic longitude HelioCoordinates heliocentric ecliptic XYZ coordinates LocalHourAngle local hour angle MagneticFieldAtLightCylinder magnetic field at light cylinder MaximalAltitudeTime next maximum altitude time MeanFluxDensityFourHundredMHz mean flux density at 400 MHz MeanFluxDensityFourteenHundredMHz mean flux density at 1400 MHz MeasuredSpectralIndex measured spectral index MedianCompanionMass median companion mass MinimumCompanionMass minimum companion mass Name name ObjectType object type Parallax parallax PeriastronLongitude periastron longitude PeriodSound period sound ProjectedSemimajorAxisLightSeconds projected semimajor axis ProperMotion proper motion ProperMotionDeclination proper motion declination ProperMotionRightAscension proper motion right ascension PulsarType pulsar type PulseWidthFiftyPercentPeak pulse width at 50% peak PulseWidthTenPercentPeak pulse width at 10% peak RadioLuminosityFourHundredMHz radio luminosity at 400 MHz RadioLuminosityFourteenHundredMHz radio luminosity at 1400 MHz RightAscension right ascension RiseTime next rise RotationMeasure rotation measure RotationPeriod rotation period SetTime next set SiderealHourAngle sidereal hour angle SpinDownAge spin down age SpinDownAgeFromCorrectedPeriodDerivative spin down age corrected for proper motion SpinDownEnergyLossRate spin down energy loss rate SunElongation elongation from the Sun SurfaceMagneticDipoleFromCorrectedPeriodDerivative surface magnetic flux density corrected for proper motion SurfaceMagneticFluxDensity surface magnetic flux density Surveys surveys TemporalBroadening temporal broadening TransitTime next transit time TransverseVelocity transverse velocity ZenithAngle zenith angle
Details
- "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:
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"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]:
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"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]:
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"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
open all close allBasic Examples (6)
for discovery:["crab pulsar"]Determine the distance to a pulsar:
["PSR J0006+1834"]["DistanceFromEarth"]Retrieve a dataset of all available properties for an entity:
["Vela pulsar"]["Dataset"]Find the pulsars with a rotation period of less than 3 milliseconds:
EntityClass["Pulsar", {"RotationPeriod" -> LessThan[Quantity[3, "Miliseconds"]]}]//EntityList//ShortFind the equatorial coordinates of a pulsar:
Entity["Pulsar", "PSRJ0421Minus0345"][{"RightAscension", "Declination"}]Find the current sky position of a pulsar from your location:
EntityValue[["PSR J1901+0510"], {"Altitude", "Azimuth"}, "PropertyAssociation"]Scope (4)
Implicit Entity Classes (1)
Property Classes (1)
Represent equatorial coordinate properties associated with pulsars:
EntityPropertyClass["Pulsar", "EquatorialCoordinates"]Get a list of available property classes for pulsars:
EntityValue["Pulsar", "PropertyClasses"]Find the list of properties included in a property class:
EntityPropertyClass["Pulsar", "EquatorialCoordinates"]["Properties"]Obtain the property values for the properties in a property class for an entity:
EntityValue[Entity["Pulsar", "PSRJ0034Minus0534"], EntityPropertyClass["Pulsar", "EquatorialCoordinates"]]Qualifiers (2)
Some properties accept qualifiers:
EntityValue[EntityProperty["Pulsar", "Constellation"], "Qualifiers"]EntityValue[EntityProperty["Pulsar", "RiseTime"], "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:
EntityValue[Entity["Pulsar", "PSRJ0534Plus2200"], EntityProperty["Pulsar", "RiseTime", {"Location" -> #}]& /@ {GeoPosition[{40.1, -88.2}], ["Joplin"], ["capital city of Iowa"]}]Dates (1)
Date qualifiers can accept an explicit DateObject or queries that evaluate to a DateObject:
EntityValue[["crab pulsar"], EntityProperty["Pulsar", "Altitude", {"Date" -> #}]& /@ {DateObject[{2014, 4, 9, 22, 0, 0}, "Instant", "Gregorian", -5.], ["birth date of Michael Jackson"]}]Date qualifiers can also be specified using Dated:
EntityValue[["crab pulsar"], Dated["Altitude", #]& /@ {DateObject[{2014, 4, 9, 22, 0, 0}, "Instant", "Gregorian", -5.], ["birth date of Michael Jackson"]}]
Pulsar Source Information