cds.astro
Class FK5

java.lang.Object
  cds.astro.Astroframe
      cds.astro.Equatorial
          cds.astro.FK5

All Implemented Interfaces:

java.io.Serializable

public class FK5
extends Equatorial

The FK5 is an equatorial coordinate system (coordinate system linked to the Earth) based on its J2000 position. As any equatorial frame, the FK5-based follows the long-term Earth motion (precession).

Author:

Francois Ochsenbein (CDS)

See Also:

Serialized Form

Field Summary

Fields inherited from class cds.astro.Astroframe

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

Constructor Summary

FK5()
Instanciate an FK5 frame (at default J2000 equinox)

FK5(double equinox)
Instanciate an FK5 frame

Method Summary

double[][]

toICRSmatrix() Defines the rotation matrix to rotate to ICRS

Methods inherited from class cds.astro.Equatorial

toString

Methods inherited from class cds.astro.Astroframe

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

Methods inherited from class java.lang.Object

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

Constructor Detail

FK5

public FK5(double equinox)

Instanciate an FK5 frame

Parameters:

equinox - the equinox of definition, in Julian Year.

FK5

public FK5()

Instanciate an FK5 frame (at default J2000 equinox)

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 to ICRS frame