stella.acquire

Interface RayPath

All Superinterfaces:

CcdReference, Horizontal

All Known Implementing Classes:

AbstractHorizontalGeometry, CoudeFocusGeometry, DerotatorGeometry, NasmythFocusGeometry, PrimeFocusGeometry

public interface RayPath
extends Horizontal, CcdReference

Converts CCD-pixel coordinates in telescope coordinates, thus in STELLA we convert in azimuth/zenith distances.

Author:

wooz

Method Summary

Modifier and Type	Method and Description
Vector2D	getPixelPositionFromRaDe(Point2D to, Vector2D center, Star catalog) Converts a star to an anticipated pixel position on the CCD.
Vector2D	getTcsShiftFromPixelDistance(Vector2D pix) Converts unbinned CCD-pixel shift into shifts in the telescope system.

Methods inherited from interface stella.acquire.Horizontal

getAltitude, getAzimuth, getParallacticAngle

Methods inherited from interface stella.acquire.CcdReference

getArcsecPerPixel, getChirality, getEquatorialAngle, getHorizontalAngle

Method Detail

getTcsShiftFromPixelDistance

Vector2D getTcsShiftFromPixelDistance(Vector2D pix)

Converts unbinned CCD-pixel shift into shifts in the telescope system. This shift can be readily applied to the telescope TCS via an offset command. Depending on the mounting geometry, the translation may be time dependent, thus we supply the parameters of the current observation as an argument.

Parameters:

pix - The pixel shift recorded from a match

rot - External parameters for image rotation.

Returns:

getPixelPositionFromRaDe

Vector2D getPixelPositionFromRaDe(Point2D to,
                                  Vector2D center,
                                  Star catalog)

Converts a star to an anticipated pixel position on the CCD. Must provide the acquisition center on the CCD and the matching ra/dec of this center. Depending on the mounting geometry, the translation may be time dependent, thus we supply the parameters of the current observation as an argument.

Parameters:

to - The CCD hot-spot coordinates, i.e. the acquisition center.

center - The acquisition center in ra/dec on sky.

catalog - The star from a catalog entry.

Returns: