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In astronomy, surface brightness (SB) quantifies the apparent brightness or flux density per unit angular area of a spatially extended object such as a galaxy or nebula, or of the night sky background. An object's surface brightness depends on its surface luminosity density, i.e., its luminosity emitted per unit surface area.
As the radius increases, the surface area will also increase, and the constant luminosity has more surface area to illuminate, leading to a decrease in observed brightness. =, where is the area of the illuminated surface. is the flux density of the illuminated surface.
The absolute magnitude in the table corresponds to an albedo of 0.434. ... absolute magnitude or luminosity versus spectral color or surface ... Surface brightness ...
Luminance is thus an indicator of how bright the surface will appear. In this case, the solid angle of interest is the solid angle subtended by the eye's pupil. Luminance is used in the video industry to characterize the brightness of displays. A typical computer display emits between 50 and 300 cd/m 2.
Toggle the table of contents. Orders of magnitude (illuminance) 1 language. Deutsch; ... Moon surface [5] [6] 10 4: 5 kcd/m 2: Typical photographic scene in full ...
Illuminance diagram with units and terminology. In photometry, illuminance is the total luminous flux incident on a surface, per unit area. [1] It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. [2]
Planetary Nebula Luminosity Function 0.3 15.4 ± 1.1 50 Globular Cluster Luminosity Function 0.4 18.8 ± 3.8 50 Surface Brightness Fluctuations 0.3 15.9 ± 0.9 50 Sigma-D relation 0.5 16.8 ± 2.4 > 100 Type Ia Supernovae 0.10 19.4 ± 5.0 > 1000
The apparent magnitude (m) is the brightness of an object and depends on an object's intrinsic luminosity, its distance, and the extinction reducing its brightness. The absolute magnitude ( M ) describes the intrinsic luminosity emitted by an object and is defined to be equal to the apparent magnitude that the object would have if it were ...