单词 | total magnitude |
释义 | total magnitudetotal magnitude(integrated magnitude) A measure of the brightness of an extended object, such as a galaxy or nebula, obtained by summing the surface brightness over the entire image area or by measuring the amount of light received through a series of apertures of increasing diameter with a photoelectric photometer. The readings are found gradually to approach an upper limiting magnitude, which, corrected for night-sky brightness, gives the total magnitude. |
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