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Adaptive
aperture magnitudes: pixel values are
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integrated
within a circular or elliptical aperture
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which is
automatically scaled to the object
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Needs 2 passes
through the data
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Weakly biased
against faint or low surface brightness sources
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Contamination
by close neighbours must be dealt with
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Fairly
efficient in terms of S/N
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Supposed to
provide a kind of “all ground photometry” with
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typical
accuracy ~ 0.1 mag.
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Large galaxy samples
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OK for stars at high galactic latitude
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Caution needed for low surface brightness
stuff
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