Representing Celestial Coordinate Systems - 2

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• Composite of Centaurus A consisting of radio continuum, 21cm HI line emission, and X-ray images on an optical background extracted from the Digitized Sky Survey (DSS).



• Coordinate information stored in varying formats. DSS coordinates are particularly idiosyncratic (accurate coordinates required for HST guide star catalogue) - requires special purpose software to interpret.



• Standardized coordinate representation would facilitate
  
  
  • Image overlay.
  
  
  
  • Determination of accurate (astrometric) coordinates.