Computes the mean place of a star for J2000.0

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.1.1.2619)

Syntax

C#
public static short MeanStar(
	double tjd,
	ref BodyDescription earth,
	double ra,
	double dec,
	ref double mra,
	ref double mdec
)
Visual Basic
Public Shared Function MeanStar ( _
	tjd As Double, _
	ByRef earth As BodyDescription, _
	ra As Double, _
	dec As Double, _
	ByRef mra As Double, _
	ByRef mdec As Double _
) As Short
Visual C++
public:
static short MeanStar(
	double tjd, 
	BodyDescription% earth, 
	double ra, 
	double dec, 
	double% mra, 
	double% mdec
)

Parameters

tjd
Type: System..::..Double
TT (or TDT) Julian date of apparent place.
earth
Type: ASCOM.Astrometry..::..BodyDescription%
Pointer to structure containing the body designation for the Earth
ra
Type: System..::..Double
Apparent right ascension in hours, referred to true equator and equinox of date 'tjd'.
dec
Type: System..::..Double
Apparent declination in degrees, referred to true equator and equinox of date 'tjd'.
mra
Type: System..::..Double%
OUT: Mean right ascension J2000.0 in hours.
mdec
Type: System..::..Double%
OUT: Mean declination J2000.0 in degrees.

Return Value

   0...Everything OK.
   1...Iterative process did not converge after 20 iterations.
 >10...Error from function 'app_star'.

Remarks

Computes the mean place of a star for J2000.0, given its apparent place at date 'tjd'. Proper motion, parallax and radial velocity are assumed to be zero.

See Also