Nebula
Related Interpreter »Nebulae from a variety of well‐known catalogs.
[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["Nebula",{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 AltitudeTransit next transit altitude AngularDiameterFromEarth angular diameter AngularRadiusFromEarth angular radius ApparentAltitude apparent altitude ApparentMagnitude apparent magnitude Azimuth azimuth AzimuthRise azimuth at rise AzimuthSet azimuth at set BlueBandMagnitude blue band magnitude BooleanRise above the horizon Classes classes Constellation constellation DailyTimeAboveHorizon daily time above horizon Declination declination Diameter average diameter 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 XYZ coordinates ICNumber IC number Image image LocalHourAngle local hour angle MajorAxis major axis MaximalAltitudeTime next maximum altitude time MinorAxis minor axis Name name NGCNumber NGC number ObjectType object type PositionAngle position angle RadialVelocity radial velocity Radius average radius Redshift redshift RightAscension right ascension RiseTime next rise SetTime next set SiderealHourAngle sidereal hour angle TransitTime next transit time VisualBandMagnitude visual band magnitude ZenithAngle zenith angle
Details
- "Nebula" entities include the majority of nebulae from the Revised New General Catalogue and Index Catalogue, as well as members of the Messier Catalog.
- "Nebula" entity classes include groups based on nebula type, such as planetary nebulae and diffuse nebulae, as well as groups related to catalog membership, such as Messier objects.
- Some properties are available for the "Nebula" entity type as a whole and can be given using the form EntityValue["Nebula",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["Nebula",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 (8)
for discovery:Scope (4)
Property Classes (1)
Qualifiers (2)
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:
Nebula Source Information