Exploring Triton's UV Spectrum: the First 1800-2500 a UV - CYCLE3 High

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Hst Proposal Id #4662

Scientific paper

We propose to make observations of Triton using the FOS/BL with G190H to survey the 1800-2200 A spectral region, and FOS/BL G270H to survey the 2200-2500 A region. Neither of these spectral regions have been observed before. These exposures will exhibit 1.5-2 A resolution and good S/N. Our objectives are to search for (i) direct evidence of CO and other O-bearing molecules in Triton's atmosphere, (ii) evidence of hydrocarbon or nitrile absorptions on Triton's surface, and (iii) to determine Triton's 1800-2500 A albedo and albedo slope. These objectives will complete the first-order spectral characterization of Triton. Only HST has the sensitivity to carry out these UV studies. As a byproduct of the G270H exposure, the 2500-3250 A region will also be observed, adding a fifth spectrum to improve the sparse database on Triton's UV rotational variability.

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