ASCOM.Astrometry Namespace

Summary

This namespace contains all ASCOM astrometry components together with associated enums and structures. The astrometry components (Transform, NOVAS-COM and Kepler) are located in the ASCOM.Astrometry.Components namespace while unified enums and structures are in the ASCOM.Astrometry namespace and serve all three components.

Transform is a new component while those familiar with the Kepler and NOVAS-COM components will recognise find all of their functionality in this namespace. Further information is given in the "Which NOVAS" topic at the head of this help file.

Structures

	Structure	Description
	BodyDescription	Structure to hold body type, number and name
	CatEntry	Structure to hold astrometric catalogue data
	CatEntry3	Catalogue entry structure
	FundamentalArgs	Structure to hold Sun and Moon fundamental arguments
	InSpace	Observer’s position and velocity in a near-Earth spacecraft.
	Object3	Celestial object structure
	Observer	General specification for the observer's location
	OnSurface	Parameters of observer's location
	PosVector	Structure to hold a position vector
	RAOfCio	Right ascension of the Celestial Intermediate Origin (CIO) with respect to the GCRS.
	SiteInfo	Structure to hold site information
	SkyPos	Celestial object's place in the sky
	VelVector	Structure to hold a velocity vector

Enumerations

	Enumeration	Description
	Accuracy	Calculation accuracy
	Body	Body number starting with Mercury = 1
	BodyType	Type of body, Major Planet, Moon, Sun or Minor Planet
	CoordSys	Coordinate system of the output position
	EarthDeflection	Location of observer, determining whether the gravitational deflection due to the earth itself is applied.
	EquinoxType	Type of equinox
	EventType	Type of event for which an ephemeris is required
	FrameConversionDirection	Direction of frame conversion
	GstType	Type of sidereal time
	Method	Computation method
	NutationDirection	Direction of nutation correction
	ObjectType	Type of object
	ObserverLocation	Location of observer
	Origin	Co-ordinate origin: centre of Sun or solar system barycentre
	OutputVectorOption	Output vector reference system
	PoleOffsetCorrection	Type of pole offset
	ReferenceSystem	Reference system in which right ascension is given
	RefractionOption	Type of refraction correction
	Target	Body or location
	TransformationDirection	Direction of transformation: ITRS to Terrestrial Intermediate or vice versa
	TransformationOption	Type of transformation: Epoch, Equator and Equinox or all three
	TransformationOption3	Type of transformation