New Fictional SpecType Problem

[Mr Noob]

Hi

I have created a new fictional spectral class of star. It is the ystar and its appearance is a pale green but there is a problem. Whenever I define a star's spec type as "y", I launch celestia only to find that the star has the spec type "?" on it.
What am I doing wrong?

I got the idea when I downloaded the "Barmel System", as it is unique with its Purple Star. So how would I get a green star in Celestia?

Thanks

Mr Noob

[selden]

Celestia only displays valid spectral types.

But that needn't stop you from using whatever texture you want, giving it whatever color you want.