NovasReadEph Method

Produces the Cartesian heliocentric equatorial coordinates of the asteroid for the J2000.0 epoch coordinate system from a set of Chebyshev polynomials read from a file.

Definition

Namespace: ASCOM.Tools.Novas31
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea

C#

public static double[] ReadEph(
	int Mp,
	string Name,
	double Jd,
	ref int Err
)

VB

Public Shared Function ReadEph ( 
	Mp As Integer,
	Name As String,
	Jd As Double,
	ByRef Err As Integer
) As Double()

Parameters

Mp Int32

The number of the asteroid for which the position in desired.

Name String

The name of the asteroid.

Jd Double

The Julian date on which to find the position and velocity.

Err Int32

            = 0 ( No error )
            = 1 ( Memory allocation error )
            = 2 ( Mismatch between asteroid name and number )
            = 3 ( Julian date out of bounds )
            = 4 ( Cannot find Chebyshev polynomial file )

Return Value

Double
6-element array of double containing position and velocity vector values.

Remarks

The file name of the asteroid is taken from the name given. It is assumed that the name is all in lower case characters.

This routine will search in the application's current directory for a file of Chebyshev polynomial coefficients whose name is based on the provided Name parameter: Name.chby

Further information on using NOVAS with minor planet data is given here: http://www.usno.navy.mil/USNO/astronomical-applications/software-products/usnoae98

Version Information

.NET Standard

Supported in: 2.0