Name

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  optaxis

Purpose (one Line Only)

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  Search for the optical axis in an astronomical image

Description

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  This routine only makes sense if you need a non-linear solution
    for your astrometry from an image.

Category

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  Astrometry

Calling Sequence

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  optaxis,fn,terms,xopt,ypot,raopt,decopt

Inputs

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  fn - file name of image to analyze
          This is a valid name that will lead to finding other related
            files based on this name. The name is typically of the form
            root.NNN where NNN is a three digit number. In this case,
            the ref file is NNN.ref and is found in the Refstars
            directory relative to the current directory.
  terms - string array with the names of terms to fit (see astterms.pro)

Optional Input Parameters

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Keyword Input Parameters

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Outputs

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  xopt - X coordinate of the optical axis in native pixel coordinates.
  yopt - Y coordinate of the optical axis in native pixel coordinates.
  raopt - (radians) Right Ascension of the position (xopt,yopt)
  decopt - (radians) Declination of the position (xopy,yopt)

Keyword Output Parameters

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Common Blocks

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Side Effects

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Restrictions

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Procedure

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Modification History

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  Written by Marc W. Buie, Southwest Research Institute, 2009/12/08