Exoplanet

Planets beyond the solar system.

Entity["Exoplanet",name] or

represents an entity of type "Exoplanet".

[prop]

gives the value of a specified property.

[{prop_i,…}]

gives the value of a list of properties.

[prop,{qual_ival_i,…}]

gives the value of a specified property modified by qualifier rules qual_i->val_i.

[Dated[prop,date]]

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

EntityClass["Exoplanet",{prop_ispec_i,…}]

represents a class of entities with values of prop_i defined by spec_i.

Sample Entities

Sample Entity Classes

Properties

	AlphanumericName	alphanumeric name
	AlternateNames	alternate names
	Altitude	altitude
	AltitudeTransit	next transit altitude
	AngularDiameterFromEarth	angular diameter
	AngularRadiusFromEarth	angular radius
	ApparentAltitude	apparent altitude
	AverageOrbitDistance	average orbit distance
	Azimuth	azimuth
	AzimuthRise	azimuth at rise
	AzimuthSet	azimuth at set
	BooleanRise	above the horizon
	Classes	classes
	Component	component
	Constellation	constellation
	DailyTimeAboveHorizon	daily time above horizon
	Declination	declination
	Density	mean density
	Diameter	average diameter
	DiameterInterval	diameter interval
	DiscoveryDate	discovery date
	DiscoveryMethod	discovery method
	DistanceFromEarth	distance from Earth
	DistanceFromSun	distance from Sun
	DistanceInterval	distance interval
	DurationTransit	transit duration
	Eccentricity	orbital eccentricity
	EccentricityInterval	orbital eccentricity interval
	EntityClasses	entity classes
	EntityTypeList	entity type list
	EscapeVelocity	escape velocity
	GalacticLatitude	galactic latitude
	GalacticLongitude	galactic longitude
	GeocentricEclipticLatitude	geocentric ecliptic latitude
	GeocentricEclipticLongitude	geocentric ecliptic longitude
	GravitationalConstantMassProduct	gravitational constant mass product
	Gravity	gravity
	GreenwichHourAngle	Greenwich hour angle
	HeliocentricEclipticLatitude	heliocentric ecliptic latitude
	HeliocentricEclipticLongitude	heliocentric ecliptic longitude
	HelioCoordinates	heliocentric XYZ coordinates
	Inclination	orbital inclination
	InclinationInterval	orbital inclination interval
	LocalHourAngle	local hour angle
	MajorAxis	orbital major axis
	Mass	mass
	MassInterval	mass interval
	MaximalAltitudeTime	next maximum altitude time
	MinorAxis	orbital minor axis
	MomentOfInertia	rotational moment of inertia
	Name	name
	ObjectType	object type
	OrbitCenter	orbit center
	OrbitCircumference	orbit circumference
	OrbitPeriod	orbital period
	OrbitPeriodInterval	orbital period interval
	PeriapsisLongitude	longitude of periapsis ϖ
	PeriapsisLongitudeInterval	longitude of periapsis interval
	PlanetaryEquilibriumTemperature	planetary equilibrium temperature
	PlanetaryEquilibriumTemperatureInterval	planetary equilibrium temperature interval
	PrimaryStarKSemiamplitude	primary star K semiamplitude
	Radius	average radius
	RadiusInterval	average radius interval
	RightAscension	right ascension
	RiseTime	next rise
	RocheLimit	Roche limit
	SemimajorAxis	orbital semimajor axis
	SemimajorAxisInterval	orbital semimajor axis interval
	SemiminorAxis	orbital semiminor axis
	SetTime	next set
	SiderealHourAngle	sidereal hour angle
	SurfaceArea	surface area
	TransitDepth	transit depth
	TransitTime	next transit time
	Volume	volume
	ZenithAngle	zenith angle

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 (5)

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: 117–142. This method allows you to determine an inner and outer radius of the habitable zone around a star:

Property Classes (1)

Represent equatorial coordinate properties associated with exoplanets:

Get a list of available property classes for exoplanets:

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 (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:

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