--- title: "AstronomicalObservatory" language: "en" type: "Entity" summary: "Astronomical observatories around the world." canonical_url: "https://reference.wolfram.com/language/ref/entity/AstronomicalObservatory.html" source: "Wolfram Language Documentation" related_guides: - title: "Entity Types" link: "https://reference.wolfram.com/language/guide/EntityTypes.en.md" --- # AstronomicalObservatory Astronomical observatories around the world. [Related Interpreter](https://reference.wolfram.com/language/ref/interpreter/AstronomicalObservatory.en.md) Entity["AstronomicalObservatory", name] or Entity[...] represents an entity of type "AstronomicalObservatory". Entity[...][prop] gives the value of a specified property. Entity[...][{propi, …}] gives the value of a list of properties. EntityClass["AstronomicalObservatory", {propi -> speci, …}] represents a class of entities with values of propi defined by speci. ## Sample Entities * Entity["AstronomicalObservatory", "Hiratsuka"]Entity["AstronomicalObservatory", "Kanab"]Entity["AstronomicalObservatory", "ObservatorioDeCantabria"]Entity["AstronomicalObservatory", "ObservatorioTayaBeixoBarquisimeto"]Entity["AstronomicalObservatory", "Oizumi"]Entity["AstronomicalObservatory", "PinoTorinese"]Entity["AstronomicalObservatory", "TaylorRangeBrisbane"]Entity["AstronomicalObservatory", "Vesqueville"]Entity["AstronomicalObservatory", "Winchester"]Entity["AstronomicalObservatory", "Yorii"]**…** ## Properties | | | | -------------- | ------------------------------------ | | Coordinates | coordinates | | Country | country | | Elevation | elevation | | EntityClasses | entity classes | | EntityTypeList | entity type list | | Latitude | latitude | | Longitude | longitude (λ) | | MPCCode | Minor Planet Center observatory code | | Name | name | | Position | position | | Radius | distance to Earth center (ρ) | ## Details * ``"AstronomicalObservatory"`` entities include a subset of observatories that have been assigned observatory codes by the Minor Planet Center. * Some properties are available for the ``"AstronomicalObservatory"`` entity type as a whole and can be given using the form ``EntityValue["AstronomicalObservatory", 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["AstronomicalObservatory", 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 (4) ### Basic Examples (4) Use ctrl+= for entity discovery: ```wl In[1]:= \[FreeformPrompt]["Lowell Observatory"] Out[1]= Entity["AstronomicalObservatory", "LowellAndersonMesaStation"] ``` --- Find a property value for an entity: ```wl In[1]:= Entity["AstronomicalObservatory", "Hiratsuka"]["Country"] Out[1]= Entity["Country", "Japan"] ``` --- Retrieve a dataset of all available properties for an entity: ```wl In[1]:= Entity["AstronomicalObservatory", "Vesqueville"]["Dataset"] Out[1]= Dataset[Association[EntityProperty["AstronomicalObservatory", "Country"] -> Entity["Country", "Belgium"], EntityProperty["AstronomicalObservatory", "Elevation"] -> Quantity[462.5571939673779, "Meters"], EntityProperty["AstronomicalObservato ... on[{50.005292646783055, 5.3983}], EntityProperty["Thing", "EntityClasses"] -> Missing["NotAvailable"], EntityProperty["Thing", "EntityTypeList"] -> {EntityType["AstronomicalObservatory"]}, EntityProperty["Thing", "Name"] -> "Vesqueville"]] ``` --- Find the observatories at the highest elevations in South America: ```wl In[1]:= EntityClass["AstronomicalObservatory", {"Country" -> GeoWithinQ[EntityClass["Country", "SouthAmerica"]], "Elevation" -> TakeLargest[5]}]//EntityList Out[1]= {Entity["AstronomicalObservatory", "Campinas"], Entity["AstronomicalObservatory", "GeminiSouthCerroPachon"], Entity["AstronomicalObservatory", "Merida"], Entity["AstronomicalObservatory", "Quito"], Entity["AstronomicalObservatory", "UniversityOfTheAndesStation"]} ``` ## See Also * [`WeatherStation`](https://reference.wolfram.com/language/ref/entity/WeatherStation.en.md) * [`ParticleAccelerator`](https://reference.wolfram.com/language/ref/entity/ParticleAccelerator.en.md) * [`NuclearReactor`](https://reference.wolfram.com/language/ref/entity/NuclearReactor.en.md) * [`NuclearTestSite`](https://reference.wolfram.com/language/ref/entity/NuclearTestSite.en.md) * [`NuclearExplosion`](https://reference.wolfram.com/language/ref/entity/NuclearExplosion.en.md) * [`AstronomicalObservatory`](https://reference.wolfram.com/language/ref/interpreter/AstronomicalObservatory.en.md) * [`ComputedAstronomicalObservatory`](https://reference.wolfram.com/language/ref/interpreter/ComputedAstronomicalObservatory.en.md) * [`AstronomicalObservatory`](https://reference.wolfram.com/language/ref/textcontent/AstronomicalObservatory.en.md) ## Related Guides * [Entity Types](https://reference.wolfram.com/language/guide/EntityTypes.en.md) ## History * [Introduced in 2019 (12.0)](https://reference.wolfram.com/language/guide/SummaryOfNewFeaturesIn120.en.md)