org.jastronomy.jsofa

Class JSOFA.TangentPlaneCoordinate

java.lang.Object

org.jastronomy.jsofa.JSOFA.TangentPlaneCoordinate

Enclosing class:

JSOFA

public static class JSOFA.TangentPlaneCoordinate
extends Object

Tangent Plane Position consisting of (xi, eta) pairs in radians.

Notes:

1. The tangent plane projection is also called the "gnomonic projection" and the "central projection".
2. The eta axis points due north in the adopted coordinate system. If the spherical coordinates are observed (RA,Dec), the tangent plane coordinates (xi,eta) are conventionally called the "standard coordinates". For right-handed spherical coordinates, (xi,eta) are also right-handed. The units of (xi,eta) are, effectively, radians at the tangent point.

Since:

JSOFA release 20180130

Author:

Paul Harrison (paul.harrison@manchester.ac.uk)

Field Summary

Fields

Modifier and Type	Field and Description
double	eta
int	status status.
double	xi

Constructor Summary

Constructors

Constructor and Description
TangentPlaneCoordinate(double xi, double eta, int j)

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

xi

public double xi

eta

public double eta

status

public int status

status. 0 = OK 1 = star too far from axis 2 = antistar on tangent plane 3 = antistar too far from axis

Constructor Detail

TangentPlaneCoordinate

public TangentPlaneCoordinate(double xi,
                              double eta,
                              int j)