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photometer

(instrument measuring brightness)

A photometer is an instrument measuring brightness, used in observing stars, etc., i.e., determining their magnitude.

A CCD is essentially a grid of photometers, and a photometer in modern astronomy may be a CCD, aiming to catch all the photons from a star. The apparent brightness of a star is found by adding the count of all the photons received in the Airy disk of the star in question.


(EMR,visible light,instrument type)
http://en.wikipedia.org/wiki/Photometer
http://en.wikipedia.org/wiki/Photometry_(astronomy)

Referenced by:
Gaia
Hubble Space Telescope (HST)
Mercator Telescope
SPHEREx
Spitzer Space Telescope (SST)
2dF Galaxy Redshift Survey (2dFGRS)

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