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NOVAS31TopoStar Method
Computes the topocentric place of a star at date 'JdTt', given its catalog mean place, proper motion, parallax, and radial velocity.

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.3.0.2839)
Syntax
public short TopoStar(
	double JdTt,
	double DeltaT,
	CatEntry3 Star,
	OnSurface Position,
	Accuracy Accuracy,
	ref double Ra,
	ref double Dec
)

Parameters

JdTt
Type: SystemDouble
TT Julian date for topocentric place.
DeltaT
Type: SystemDouble
Difference TT-UT1 at 'JdTt', in seconds of time.
Star
Type: ASCOM.AstrometryCatEntry3
Catalog entry structure containing catalog data for the object in the ICRS
Position
Type: ASCOM.AstrometryOnSurface
Specifies the position of the observer
Accuracy
Type: ASCOM.AstrometryAccuracy
Code specifying the relative accuracy of the output position.
Ra
Type: SystemDouble
Topocentric right ascension in hours, referred to true equator and equinox of date 'JdTt'.
Dec
Type: SystemDouble
Topocentric declination in degrees, referred to true equator and equinox of date 'JdTt'.

Return Value

Type: Int16
 =  0 ... Everything OK.
 =  1 ... Invalid value of 'Where' in structure 'Location'.
 > 10 ... Error code from function 'MakeObject'.
 > 20 ... Error code from function 'Place'.
 
Remarks