Comet
相关诠释器 »我们的太阳系中的彗星.
[prop]
给出指定属性的值.
[{prop1,…}]
给出属性列表的值.
[prop,{qualivali,…}]
给出由限定符 quali->vali 修改的指定属性的值.
[Dated[prop,date]]
给出特定日期规范相对应的属性值.
EntityClass["Comet",{propispeci,…}]
表示实体类,其中 propi 的值由 speci 定义.
实体范例
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实体类范例
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属性
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Age age AlphanumericName alphanumeric name AlternateNames alternate names Altitude altitude AngularDiameterFromEarth angular diameter AngularRadiusFromEarth angular radius Aphelion largest distance from the Sun Apoapsis largest distance from Sun ApoapsisTime next apoapsis time ApoapsisTimeLast last apoapsis time ApparentAltitude apparent altitude ApparentMagnitude apparent magnitude AscendingNodeLongitude longitude of ascending node Ω AverageDistanceFromEarth average distance from Earth AverageOrbitalCentripetalForce average orbital centripetal force AverageOrbitDistance average orbit distance AverageOrbitVelocity average orbit velocity AverageVelocityAroundSun average heliocentric velocity Azimuth azimuth BooleanRise above the horizon Classes classes Constellation constellation DailyTimeAboveHorizon daily time above horizon Declination declination DestructionDate destruction date Diameter average diameter DiscoveryDate discovery date DistanceFromEarth distance from Earth DistanceFromSun distance from Sun EarthMOID Earth minimum orbit intersection distance EccentricAnomaly eccentric anomaly Eccentricity orbital eccentricity EntityClasses entity classes EntityTypeList entity type list EquatorialDiameter equatorial diameter EquatorialRadius equatorial radius FarthestPlanet farthest planet GalacticLatitude galactic latitude GalacticLongitude galactic longitude GeocentricEclipticLatitude geocentric ecliptic latitude GeocentricEclipticLongitude geocentric ecliptic longitude GravitationalConstantMassProduct gravitational constant mass product GreenwichHourAngle Greenwich hour angle HeliocentricEclipticLatitude heliocentric ecliptic latitude HeliocentricEclipticLongitude heliocentric ecliptic longitude HelioCoordinates heliocentric XYZ coordinates HelioVelocityVector heliocentric velocity vector IAUName IAU name Image image Inclination orbital inclination LocalHourAngle local hour angle MajorAxis orbital major axis MaximalAltitudeTime next maximum altitude time MaximumOrbitalCentripetalForce maximum orbital centripetal force MeanAnomaly mean anomaly MeanMotion mean motion MinimumOrbitalCentripetalForce minimum orbital centripetal force MinorAxis orbital minor axis Name name NearestPlanet nearest planet NuclearMagnitudeParameter nuclear magnitude parameter NuclearMagnitudeSlopeParameter nuclear magnitude slope parameter ObjectType object type OppositionTimeLast last opposition time OppositionTimeNearest nearest opposition time OppositionTimeNext next opposition time OrbitalCentripetalForce orbital centripetal force OrbitCenter orbit center OrbitCircumference orbit circumference OrbitPath orbit path OrbitPeriod orbital period OrbitRules orbit rules Periapsis smallest distance from Sun PeriapsisArgument argument of periapsis ω PeriapsisLongitude longitude of periapsis ϖ PeriapsisTime next periapsis time PeriapsisTimeLast last periapsis time Perihelion nearest distance from the Sun PrimaryDesignation primary designation Radius average radius RetrogradeApparentMotionQuery apparent direction RightAscension right ascension RiseTime next rise RotationPeriod rotation period SemimajorAxis orbital semimajor axis SemiminorAxis orbital semiminor axis SetTime next set Shape shape SiderealHourAngle sidereal hour angle SolarConjunctionTimeLast last solar conjunction time SolarConjunctionTimeNearest nearest solar conjunction time SolarConjunctionTimeNext next solar conjunction time SolarDay solar day SphereOfInfluenceRadius sphere of influence radius SurfaceArea surface area TotalMagnitudeParameter total magnitude parameter TotalMagnitudeSlopeParameter total magnitude slope parameter TransitTime next transit time TrueAnomaly true anomaly VelocityAroundSun instantaneous heliocentric velocity Volume volume ZenithAngle zenith angle
详细信息
- "Comet" 实体包括已观察到的现代和历史彗星的子集.
- "Comet" 实体类包括基于轨道类型的分组,但也根据定义,如 "great comets" 分组.
- Due to the fact that most comets have never been visited directly by spacecraft, most available data is focused on orbital parameters. Physical properties such as mass and radius are more sparse.
- 部分属性可用于作为整体的 "Comet" 实体类型,并可用 EntityValue["Comet",property] 格式给出,此类属性包括:
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"Properties" 可用属性列表 "PropertyCanonicalNames" 可用属性的标准名称 "SampleEntities" 可用实体的范例列表(通常长度为 10) "SampleEntityClasses" 可用实体类的范例列表(通常长度为 10) "EntityCount" 可用实体的数目 "Entities" 可用实体的列表 "EntityCanonicalNames" 可用实体的标准名称 "EntityClasses" 可用实体类的列表 "EntityClassCanonicalNames" 可用实体类的标准名称 "PropertyClasses" 可用属性分类的列表 "PropertyClassCanonicalNames" 可用属性分类的标准名称 "PropertyCount" 可用属性的数目 - 以下注释可用于 EntityValue["Comet",property,annotation] 的第三个参数中:
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"Source" 属性的来源信息 "Date" 实体-属性值相关联的日期(若存在) "EntityAssociation" 实体和实体-属性值的关联 "PropertyAssociation" 属性和实体-属性值的关联 "EntityPropertyAssociation" 此关联中,指定实体是键,值为属性和实体-属性值的嵌套关联 "PropertyEntityAssociation" 此关联中,指定属性是键,值为实体和实体-属性值的嵌套关联 "Dataset" 此数据集,指定实体是键和值为属性名称和实体-属性值的关联 - 以下注释可用于 EntityValue[property,annotation] 的第二个参数中:
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"Qualifiers" 可用于属性的限定词列表 "QualifierValues" 可用于每个限定词的可用值列表 "DefaultQualifierValues" 属性限定词的默认值列表 "Description" 属性的简短文字描述 "Definition" 属性的详细文字定义 "PhysicalQuantity" 实体-属性值相关联的物理量 "Unit" 实体-属性值相关联的单位 - Automatic 的限定词值表示一个可适用的值的格式; 例如,对于 "Date" 的限定词,包括正确的日期或日期跨度.
范例
打开所有单元关闭所有单元基本范例 (7)
范围 (4)
限定词 (2)
"location"(位置)限定符指定了观察者的位置,可支持显式 GeoPosition,基于位置的 Entity 对象户查询计算为下列之一:
日期 (1)
日期限定符可以接受显式 DateObject 或计算为 DateObject 的查询:
日期限定符也可以使用 Dated 指定: