From the Department of Physics and Astronomy,University College London;

'Water on the sun: line assignments based on variational calculations.

Abstract

The infrared spectrum of hot water observed in a sunspot has been assigned. The high temperature of the sunspot (3200 K) gave rise to a highly congested pure rotational spectrum in the 10-micrometer region that involved energy levels at least halfway to dissociation.'

And..

'These results indicate that a shift away from perturbation theory to first principles calculations is necessary in order to assign spectra of hot polyatomic molecules such as water.'
[link to www.ncbi.nlm.nih.gov]

Wow.