1. The problem statement, all variables and given/known data This isn't really a coursework question, but I thought this might be the best place for it. I have some data on two different CO line emissions from an object. Can I work out the temperature of that object by using the ratio between the intensities of the two lines, and then using something like Wiens law? I am happy to assume that the emitter is a black body, but I don't know how to solve for T except if I know the peak emission wavelength.