Thus, for many years, Vega was used as a baseline for the calibration of absolute photometric brightness scales.
2.
Vega has been extensively studied by astronomers, leading it to be termed arguably the next most important star in the sky after the Sun . Vega was the photometric brightness scale, and was one of the stars used to define the mean values for the UBV photometric system.
3.
The trouble is that artifacts from camera flaws ( lens flares, etc )-from the transmission technologies of the day ( scan-line artifacts )-and from modern data compression systems ( JPEG, GIF )-all share the property that they produce fairly sharp-edged geometrical-looking changes to the image at the lower end of the brightness scale.
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