Astrophysics (Index)About

color-color diagram

(means of comparing characteristics of stars)

A color-color diagram (CCD) 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.

Further reading: