Position and mass‐derived properties of black holes.
Entity["BlackHole",name] or 
represents an entity of type "BlackHole".
[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["BlackHole",{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 AltitudeMaximum next maximum altitude AltitudeTransit next transit altitude AngularDiameterFromEarth angular diameter AngularRadiusFromEarth angular radius ApparentAltitude apparent altitude 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 DegreesOfFreedom degrees of freedom DistanceFromEarth distance from Earth DistanceFromSun distance from Sun EffectiveDensity effective density EntityClasses entity classes EntityTypeList entity type list Entropy entropy EventHorizonArea event horizon area EventHorizonInteriorVolume event horizon interior volume EventHorizonSurfaceGravity event horizon surface gravity 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 Lifetime lifetime LocalHourAngle local hour angle Mass mass MaximalAltitudeTime next maximum altitude time Name name ObjectType object type RelatedObjects related objects RightAscension right ascension RiseTime next rise SchwarzschildRadius Schwarzschild radius SetTime next set SiderealHourAngle sidereal hour angle StellarEvolutionDiagram stellar evolution diagram SunElongation elongation from the Sun SystemMembers system members Temperature temperature TransitTime next transit time ZenithAngle zenith angle
Details
- "BlackHole" entities include black holes found in star systems throughout the Milky Way Galaxy, intermediate‐mass black holes and supermassive black holes found in the cores of galaxies.
- "BlackHole" entity classes include groups based on mass, such as "supermassive" and "stellar‐mass".
- Some properties are available for the "BlackHole" entity type as a whole and can be given using the form EntityValue["BlackHole",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["BlackHole",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
for discovery:In[1]:=1
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-fon1ss
Out[1]=1
Find the distance to a black hole:
In[1]:=1
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-oxkpp
Out[1]=1
Retrieve a dataset of all available properties for an entity:
In[1]:=1
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-f1bmtg
Out[1]=1
Find the three nearest black holes:
In[1]:=1
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-hquj66
Out[1]=1
Find the equatorial coordinates of a black hole:
In[1]:=1
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-g3r2dl
Out[1]=1
Find the current sky position of a black hole from your location:
In[1]:=1
✖
https://wolfram.com/xid/0bhhp260nemnt9k3txcu-qzw5w
Out[1]=1
Scope (4)Survey of the scope of standard use cases
Implicit Entity Classes (1)
Property Classes (1)
Represent equatorial coordinate properties associated with black holes:
In[1]:=1
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-cugj06
Out[1]=1
Get a list of available property classes for black holes:
In[2]:=2
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-il3fr8
Out[2]=2
Find the list of properties included in a property class:
In[3]:=3
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-obfyo7
Out[3]=3
Obtain the property values for the properties in a property class for an entity:
In[4]:=4
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https://wolfram.com/xid/0bhhp260nemnt9k3txcu-ccsof
Out[4]=4
Qualifiers (2)
Some properties accept qualifiers:
In[1]:=1
✖
https://wolfram.com/xid/0bhhp260nemnt9k3txcu-kbipz4
Out[1]=1
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:
In[2]:=2
✖
https://wolfram.com/xid/0bhhp260nemnt9k3txcu-ld0aw
Out[2]=2
Dates (1)
Date qualifiers can accept an explicit DateObject or queries that evaluate to a DateObject:
In[1]:=1
✖
https://wolfram.com/xid/0bhhp260nemnt9k3txcu-cytiub
Out[1]=1
Date qualifiers can also be specified using Dated:
In[2]:=2
✖
https://wolfram.com/xid/0bhhp260nemnt9k3txcu-fmg1hq
Out[2]=2
