Department of Physics AstroLab

Basic analysis using Gaia

"Gaia is an image display and analysis tool. It provides the usual facilities of image display tools, plus more astronomically useful ones such as aperture & optimal photometry, contouring, source detection, surface photometry, arbitrary region analysis, celestial coordinate readout, calibration and modification, grid overlays, blink comparison, defect patching and the ability to query on-line (WWW) catalogues."

How to use Gaia

  • Login into one of the AstroLab's Linux workstations
  • Start an xterm command line window
  • Make a directory for your workspace, e.g.
    
     mkdir edwin_hubble 
     cd edwin_hubble 
    
  • Copy the required images from the "archive" or "current" into your workspace, e.g.
    
     \cp -pr /archive/12/2005/05_02_01/saturn.ST9 . 
    
    
    or
    
     \cp -pr /archive/archive/draco/2005/05_02_01/0171.fits . 
    
    
  • Initialise the Starlink convert package, e.g.
     convert 
  • Gaia can now display a variety of formats including FITS (.fits) and SBIG's compressed format (.ST9). Gaia assumes that SBIG frames have the .ST9 file extension. To display the image e.g.
     gaia saturn.ST9 

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