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CApphot:MagErrorT
Returns the theoretically calculated value of the magnitude uncertainty resulting from the photometry measurement. The value returned is the nMagErrorT class member set by the Measure. There are two alternate names for this method and both return the same quantity.
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nMagErrorT= CApphot:MagErrorT() nMagErrorT = CApphot:MagErrT() |
nMagErrorT is the theoretical uncertainty of the
magnitude (see Mag).
The Measure method computes a theoretical value for the magnitude uncertainty and saves it as the nMagErrorT member of the class data structure. The value of nMagErrorT is returned by the present method This value is calculated using photon statistics and various instrumental parameters. In contrast, the MagError method returns a statistical estimate of the magnitude uncertainty which is based on noise measured in the background sample rather than relying totally on photon statistics.