Entity["Supernova",name] or
represents an entity of type "Supernova".
[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["Supernova",{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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AlternateNames alternate names Altitude altitude AltitudeTransit next transit altitude ApparentAltitude apparent altitude ApparentMagnitude apparent magnitude Azimuth azimuth AzimuthRise azimuth at rise AzimuthSet azimuth at set BooleanRise above the horizon Classes classes Constellation constellation DailyTimeAboveHorizon daily time above horizon Declination declination DiscoveryDate discovery date DistanceFromEarth distance from Earth DistanceFromSun distance from Sun EntityClasses entity classes EntityTypeList entity type list GalacticLatitude galactic latitude GalacticLongitude galactic longitude GeocentricEclipticLatitude geocentric ecliptic latitude GeocentricEclipticLongitude geocentric ecliptic longitude GreenwichHourAngle Greenwich hour angle HeliocentricEclipticLatitude heliocentric ecliptic latitude HeliocentricEclipticLongitude heliocentric ecliptic longitude HelioCoordinates heliocentric ecliptic XYZ coordinates LocalHourAngle local hour angle MaximalAltitudeTime next maximum altitude time MaximumLightDate maximum light date Name name ObjectType object type ParentObject parent object PositionAngle position angle Redshift redshift RightAscension right ascension RiseTime next rise SetTime next set SiderealHourAngle sidereal hour angle SupernovaGraphic telescopic view SupernovaType supernova type Surveys surveys TransitTime next transit time ZenithAngle zenith angle
Details



- "Supernova" entities include a large collection of observed historic and modern supernovae.
- "Supernova" entity classes include groups based primarily on supernova types such as "type I supernovae" and "type II supernovae".
- Some properties are available for the "Supernova" entity type as a whole and can be given using the form EntityValue["Supernova",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["Supernova",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 allclose allBasic Examples (6)Summary of the most common use cases

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-ia9mr

Determine the distance to a supernova:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-pu25lp

Retrieve a dataset of all available properties for an entity:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-f1bmtg

Find the five brightest supernovae:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-hquj66

Find the equatorial coordinates of a supernova:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-h91fzy

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

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-cnagdd

Scope (4)Survey of the scope of standard use cases
Implicit Entity Classes (1)
Property Classes (1)
Represent equatorial coordinate properties associated with supernovae:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-cugj06

Get a list of available property classes for supernovae:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-il3fr8

Find the list of properties included in a property class:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-obfyo7

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

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-ccsof

Qualifiers (2)
Some properties accept qualifiers:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-dva07d


https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-kbipz4

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:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-ld0aw

Dates (1)
Date qualifiers can accept an explicit DateObject or queries that evaluate to a DateObject:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-cytiub

Date qualifiers can also be specified using Dated:

https://wolfram.com/xid/0e231hw7qrnsgb79ofr0-fmg1hq
