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Evidence for the Exposure of Water Ice on Titan's Surface
The smoggy stratosphere of Saturn's largest moon, Titan, veils itssurface from view, except at narrow wavelengths centered at 0.83, 0.94,1.07, 1.28, 1.58, 2.0, 2.9, and 5.0 micrometers. We derived a spectrumof Titan's surface within these ``windows'' and detected featurescharacteristic of water ice. Therefore, despite the hundreds of metersof organic liquids and solids hypothesized to exist on Titan's surface,its icy bedrock lies extensively exposed.
| The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
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