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Color-Color Diagram

(means of comparing characteristics of stars)

A Color-Color Diagram is a graph plotted on two color indices of an object, e.g., B-V versus U-B. It is a useful way to characterize stars, clusters and galaxies when the distance, and thus the Absolute Magnitude, is not well known, since ratios of colors are independent of distance.

Color-Color Diagrams have been created for Extra-Solar Planets to help classify them. Colors of Transiting Planets can be deduced with sufficient observational data.