AST-833intermediate

Astronomical Photometry: Physical Mechanisms

Photometry measures the amount of light received from astronomical sources in defined wavelength bands. Photometry powers exoplanet transits, variable-star studies, supernova cosmology, color-magnitude diagrams, asteroid light curves, and galaxy surveys.

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Astronomical Photometry: Physical Mechanisms

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AST-832Astronomical Photometry: Structures & Vocabulary→

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AST-834Astronomical Photometry: Observation, Measurement & Evidence→

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Photometry measures the amount of light received from astronomical sources in defined wavelength bands.

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Detected counts are converted into calibrated flux after subtracting backgrounds and correcting instrument response.

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Standard-star networks establish photometric zero points, repeated measurements test precision, and missions such as TESS achieve stable time-series photometry capable of detecting small transit signals.