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visual magnitude

   Also found in: Legal, Encyclopedia, Wikipedia 0.03 sec.
visual magnitude
n
(Astronomy) Astronomy the magnitude of a star as determined by visual observation Compare photoelectric magnitude


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By definition, a fireball is any meteor event with brightness equal to or greater than visual magnitude -3.
Often referred to as the Great Northern Globular, M13 is a wonderful object in any instrument and with a visual magnitude of 5.
Pre-explosion pictures from the Hubble archive, taken in 1997, reveal the progenitor as a very luminous point source with an absolute visual magnitude of -10.
 
 
 
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