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eJAAVSO

O-C By Computer

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Emilia Pisani Belserene

Maria Mitchell Observatory, Nantucket, MA 02554

 

Abstract

 

Two methods are introduced in which O-C (Observed minus Calculated) is calculated automatically by allowing the computer to find residuals of observations from an adopted standard light curve. In one method the residuals are directly in the time coordinate, one for each magnitude. The other is a non-linear least squares method, minimizing the sum of the squares of the residuals in magnitude, to give a mean O-C for the group.

 

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