Planets beyond the solar system.

Entity["Exoplanet",name] or

represents an entity of type "Exoplanet".

[prop]

gives the value of a specified property.

[{propi,}]

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["Exoplanet",{propispeci,}]

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

Sample Entities

Sample Entity Classes

Properties

  • AlphanumericNamealphanumeric name
    AlternateNamesalternate names
    Altitudealtitude
    AltitudeTransitnext transit altitude
    AngularDiameterFromEarthangular diameter
    AngularRadiusFromEarthangular radius
    ApparentAltitudeapparent altitude
    AverageOrbitDistanceaverage orbit distance
    Azimuthazimuth
    AzimuthRiseazimuth at rise
    AzimuthSetazimuth at set
    BooleanRiseabove the horizon
    Classesclasses
    Componentcomponent
    Constellationconstellation
    DailyTimeAboveHorizondaily time above horizon
    Declinationdeclination
    Densitymean density
    Diameteraverage diameter
    DiameterIntervaldiameter interval
    DiscoveryMethoddiscovery method
    DiscoveryYeardiscovery year
    DistanceFromEarthdistance from Earth
    DistanceFromSundistance from Sun
    DistanceIntervaldistance interval
    DurationTransittransit duration
    Eccentricityorbital eccentricity
    EccentricityIntervalorbital eccentricity interval
    EntityClassesentity classes
    EscapeVelocityescape velocity
    GalacticLatitudegalactic latitude
    GalacticLongitudegalactic longitude
    GravitationalConstantMassProductgravitational constant mass product
    Gravitygravity
    GreenwichHourAngleGreenwich hour angle
    HelioCoordinatesheliocentric XYZ coordinates
    Inclinationorbital inclination
    InclinationIntervalorbital inclination interval
    LocalHourAnglelocal hour angle
    MajorAxisorbital major axis
    Massmass
    MassIntervalmass interval
    MaximalAltitudeTimenext maximum altitude time
    MinorAxisorbital minor axis
    MomentOfInertiarotational moment of inertia
    Namename
    ObjectTypeobject type
    OrbitCenterorbit center
    OrbitCircumferenceorbit circumference
    OrbitPeriodorbital period
    OrbitPeriodIntervalorbital period interval
    PeriapsisLongitudelongitude of periapsis ϖ
    PeriapsisLongitudeIntervallongitude of periapsis interval
    PlanetaryEquilibriumTemperatureplanetary equilibrium temperature
    PlanetaryEquilibriumTemperatureIntervalplanetary equilibrium temperature interval
    PrimaryStarKSemiamplitudeprimary star K semiamplitude
    Radiusaverage radius
    RadiusIntervalaverage radius interval
    RightAscensionright ascension
    RiseTimenext rise
    RocheLimitRoche limit
    SemimajorAxisorbital semimajor axis
    SemimajorAxisIntervalorbital semimajor axis interval
    SemiminorAxisorbital semiminor axis
    SetTimenext set
    SiderealHourAnglesidereal hour angle
    SurfaceAreasurface area
    TransitDepthtransit depth
    TransitTimenext transit time
    Volumevolume

Details

  • "Exoplanet" entities include a large collection of confirmed planets beyond the solar system.
  • "Exoplanet" entity classes include groups based primarily on size classification, e.g. "super-Earths", which may also include proximity to host stars, e.g. "hot Jupiters".
  • Some properties are available for the "Exoplanet" entity type as a whole and can be given using the form EntityValue["Exoplanet",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["Exoplanet",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  (5)

Use for discovery:

Find the mass of an exoplanet:

Get a list of exoplanets in a specified class:

Retrieve a dataset of all available properties for an entity:

Find the 3 least massive exoplanets:

Scope  (4)

Implicit Entity Classes  (1)

The habitable zone of an exoplanet is an ambiguous concept with no agreed-upon definition. There are several ways to go about determining what you might interpret as the habitable zone. All methods have a relation to their host stars. The planetary equilibrium temperature is a form of blackbody temperature for a given planet. It does not take into account greenhouse gases or other factors that could influence habitability of a planet. You can query for planets in a given system that have a planetary equilibrium temperature between 0 and 100 degrees Celsius:

There are other ways of determining the habitable zone, such as that described in Whitmire, D. and Reynolds, R. "Circumstellar Habitable Zones: Astronomical Considerations," in Doyle, L. (ed.). Circumstellar Habitable Zones, Proceedings of the First International Conference, Travis House Publications, 1996: 117142. This method allows you to determine an inner and outer radius of the habitable zone around a star:

Qualifiers  (3)

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:

Uncertainty  (1)

The "Uncertainty" qualifier can accept several possible values, and controls how uncertainty is represented in the result:

Properties that make use of the "Uncertainty" qualifier can be found with:

Applications  (7)

Create a chart showing the number of exoplanets discovered per year:

Create a chart plotting the radius versus the mass:

Create a chart plotting the mass versus the orbital period, colored by discovery method:

Create a chart plotting the density versus the radius:

Create a chart plotting the orbital eccentricity versus the orbital period, colored by discovery method:

Create a chart plotting the density versus the radius:

For each exoplanet, find all of the other exoplanets in the system:

Gather the data based on the number of exoplanets in the system:

Plot eccentricity versus the semimajor axis for systems containing one, two or three exoplanets:

Plot the radius versus the orbit period on a log-log scale:

Relations to Other Entity Types  (1)

Exoplanets orbit stars other than the Sun:

Introduced in 2019
 (12.0)