cds.astro
Class Galactic

java.lang.Object
  cds.astro.Astroframe
      cds.astro.Galactic

All Implemented Interfaces:

java.io.Serializable

public class Galactic
extends Astroframe

The Galactic frame is defined such that the plane of our Galaxy (the Milky Way) has a latitude close to zero. The galactic center has a position (0,0) in this system. It was originally defined by reference to the FK4 System.

Author:

Francois Ochsenbein (CDS)

See Also:

Serialized Form

Field Summary

static java.lang.String	class_name Name of this frame.
static double[][]	gal_1950 Rotation matrix to move from FK4 to Galactic.
static double[][]	gal_2000 Rotation matrix to move from FK5 to Galactic.

Fields inherited from class cds.astro.Astroframe

base_epoch, ed_lat, ed_lon, epoch, hms, ICRSmatrix, name, precision

Constructor Summary

Galactic()
Instanciate an Galactic frame

Method Summary

double[][]

toICRSmatrix() Defines the rotation matrix to rotate to ICRS

Methods inherited from class cds.astro.Astroframe

equals, fromICRS, fromICRS, setFrameEpoch, setICRSmatrix, toICRS, toICRS, toString, toString

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

class_name

public static java.lang.String class_name

Name of this frame.

gal_1950

public static final double[][] gal_1950

Rotation matrix to move from FK4 to Galactic.

gal_2000

public static final double[][] gal_2000

Rotation matrix to move from FK5 to Galactic. (from Hipparcos documentation vol1, Eq. 1.5.11, see ftp://cdsarc.u-strasbg.fr/pub/cats/I/239/version_cd/docs/vol1/sect1_05.pdf transformed to have a truly orthogonal matrix.

Constructor Detail

Galactic

public Galactic()

Instanciate an Galactic frame

Method Detail

toICRSmatrix

public double[][] toICRSmatrix()

Defines the rotation matrix to rotate to ICRS

Specified by:

toICRSmatrix in class Astroframe

Returns:

the 3x3 rotation matrix to convert a position in ICRS frame