The Abundance of CH3D and the D/h Ratio in Jupiter

From observations of the parallel band of mono-deuterated methane (CH3D) in the Jovian atmosphere, we have deduced a CH3D abundance and mixing ratio and a value for the D/H ratio in this planet, with due regard to the problems of Jovian atmospheric structure and deuterium fractionation. We find the D/H ratio to be significantly less than the terrestrial value and discuss some of the implications to the early history of the solar system. This observation marks the firstever detection of deuterium by any astronomical technique. Subject headings: abundances, planetary - atmospheres, planetary - Jupiter - molecules