NovasState Method

public static short State(
	ref double[] Jed,
	Target Target,
	ref double[] TargetPos,
	ref double[] TargetVel
)

Public Shared Function State ( 
	ByRef Jed As Double(),
	Target As Target,
	ByRef TargetPos As Double(),
	ByRef TargetVel As Double()
) As Short

Parameters

Jed  Double

2-element Julian date (TDB) at which interpolation is wanted. Any combination of jed[0]+jed[1] which falls within the time span on the file is a permissible epoch. See Note 1 below.

Target  Target

The requested body to get data for from the ephemeris file.

TargetPos  Double

The barycentric position vector array of the requested object, in AU. (If target object is the Moon, then the vector is geocentric.)

TargetVel  Double

The barycentric velocity vector array of the requested object, in AU/Day.

Return Value

            0 ...everything OK
            1 ...error reading ephemeris file
            2 ...epoch out of range.
            

                    = 0: Mercury,               1: Venus, 
                    = 2: Earth-Moon barycenter, 3: Mars, 
                    = 4: Jupiter,               5: Saturn, 
                    = 6: Uranus,                7: Neptune, 
                    = 8: Pluto,                 9: geocentric Moon, 
                    =10: Sun.
            

NOTE 1. For ease in programming, the user may put the entire epoch in jed[0] and set jed[1] = 0. For maximum interpolation accuracy, set jed[0] = the most recent midnight at or before interpolation epoch, and set jed[1] = fractional part of a day elapsed between jed[0] and epoch. As an alternative, it may prove convenient to set jed[0] = some fixed epoch, such as start of the integration and jed[1] = elapsed interval between then and epoch.

Reference