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Is there a simple equation ($y=f(x)$) that can give me the general shape of a black body curve?

Here's an image by Brews ohare to show you what I mean:

enter image description here

Is there a polynomial equation that can give a similar shape? It would be nice to have the horizontal asymptote at $y=0$, but isn't necessarily required if it would simplify the equation.

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You can use the free SW 'LabFit' to find the best approximation of the Plank function given a set on N points taken from the curve. Obviously every temperature T will give a different curve. –  Riccardo.Alestra Feb 17 '12 at 20:23

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up vote 4 down vote accepted

It sounds like you are looking for Planck's Law.

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