NebulaData

NebulaData["name","property"]
gives the value of the specified property for the nebula .

NebulaData[{"name1","name2",},"property"]
gives a list of property values for the specified nebula names.

NebulaData["name", "property", annotation]
gives the specified annotation associated with the property.

DetailsDetails

  • The specified in NebulaData can be an Entity, EntityClass, or canonical name.
  • The specified should be an EntityProperty, EntityPropertyClass, canonical name, or list thereof.
  • NebulaData[] gives a list of all nebula entities.
  • NebulaData["Properties"] gives a list of available properties.
  • Properties that do not apply or are not known in a particular case are indicated by Missing[].
  • Properties include:
  • "AlphanumericName"alphanumeric name
    "AlternateNames"alternate names
    "AltitudeTransit"next transit altitude
    "ApparentAltitude"apparent altitude
    "ApparentMagnitude"apparent magnitude
    "AzimuthRise"azimuth at rise
    "AzimuthSet"azimuth at set
    "BlueBandMagnitude"blue band magnitude
    "BooleanRise"above the horizon
    "CelestialAltitude"altitude
    "CelestialAzimuth"azimuth
    "Classes"classes
    "Constellation"constellation
    "Declination"declination
    "Diameter"average diameter
    "DistanceFromEarth"distance from Earth
    "DistanceFromSun"distance from Sun
    "GalacticLatitude"galactic latitude
    "GalacticLongitude"galactic longitude
    "HelioCoordinates"heliocentric XYZ coordinates
    "ICNumber"IC number
    "Image"image
    "MaximalAltitudeTime"next maximum altitude time
    "MeanFluxDensityAtOneHundredSeventyEightMHz"mean flux density at 178 MHz
    "Name"name
    "NGCNumber"NGC number
    "PositionAngle"position angle
    "RadialVelocity"radial velocity
    "Radius"average radius
    "Redshift"redshift
    "RightAscension"right ascension
    "RiseTime"next rise
    "SetTime"next set
    "TransitTime"next transit time
    "VisualBandMagnitude"visual band magnitude
  • Some properties are available for NebulaData as a whole and can be given using the form NebulaData["property"]. Such properties include:
  • "Entities"all available entities
    "EntityCount"total number of available entities
    "Classes"all available entity classes
    "EntityClassCount"total number of available entity classes
    "SampleEntities"list of sample entities
    "SampleEntityClasses"list of sample entity classes
    "EntityCanonicalNames"list of all entity canonical names
    "PropertyCanonicalNames"list of all property canonical names
    "EntityClassCanonicalNames"list of all entity class canonical names
    "RandomEntities"pseudorandom sample entities
    {"RandomEntities",n}n pseudorandom entities
    "RandomEntityClasses"pseudorandom sample entity classes
    {"RandomEntityClasses",n}n pseudorandom entity classes
  • The following annotations can be used in the third argument of NebulaData["name","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
    "Source"source information for the property
    "Date"the date associated with the entity-property value (if any)
    "PhysicalQuantity"the physical quantity associated with the entity-property value
    "Unit"the unit associated with the entity-property value
    "EntityAssociation"an Association of entities and entity-property values
    "PropertyAssociation"an Association of properties and entity-property values
  • If a function is provided as an annotation, it will be used to aggregate the result data. Typical aggregation functions include:
  • Minthe minimum value
    Maxthe maximum value
    Meanthe mean value
    Commonestthe most frequently occurring value
    Medianthe median value
    Totalreturn the total
    Lengththe number of elements

ExamplesExamplesopen allclose all

Basic Examples  (1)Basic Examples  (1)

Use Ctrl+Equal for discovery:

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Find the average diameter of a nebula:

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Find the equatorial coordinates of a nebula:

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

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Get a list of classes of nebulae:

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Find known apparent magnitudes of bright HII regions:

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Introduced in 2014
(10.0)