Abstract
Observations of Uranus during the 1975, 1976, and 1978 apparitions reveal a weak absorption at the wavelength of the R 5(1) line of HD with equivalent width 1.0 ± 0.4 m A ̊ . The D H ratio in Uranus' atmosphere implied by this line and other published spectra is (4.8 ± 1.5) × 10 −5, and may not be significantly different from that in the atmospheres of Jupiter and Saturn. In addition, the spectra exhibit two weak absorption at 6044.76 ± 0.02 and 6045.54 ± 0.02 A ̊ which we were unable to identify. No trace of absorption is visible near these wavelengths or near the HD wavelength in a laboratory spectrum of 4.92 km-am CH 4 which we obtained in an attempt to identify these absorption features and to verify that the HD feature does not arise from CH 4.
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