total magnitude

total 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.
References in periodicals archive ?
The rich open cluster NGC 7789 in Cassiopeia, about 8,000 light-years away, has a total magnitude of 6.
The total magnitude of suffering associated with flu is more difficult to quantify but anecdotes can be illuminating.
The magnitude given is the total magnitude of the coma and the brightness is spread out across the whole diameter of the comet.
9mn), the total magnitude of cash outlays was not accurately assessed, and in retrospect, it was set too high.
5 for the comet, almost in exact agreement with the total magnitude at that date in Figure 1.
CCD observers are encouraged to report total magnitude estimates, using the format given in the BAA Observing Guide and the methodology developed by Roger Dymock.
The energy of events is summed and then total magnitude is evaluated with the use of inverted formula (6).
The total magnitude of the force multiplied by the cosine of its angle with the horizon calculates the horizontal force.
While the higher grade intersections encountered so far are sure to get the attention of the market, it is the total magnitude of the mineralized area on the property that warrants consideration.
Currently, it isn't possible to measure an earthquake's total magnitude until the rumbling has stopped.
The total magnitude identified can be so daunting as to discourage a rational allocation plan.

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