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A Portrait of the Nucleus of Comet 67P/Churyumov-Gerasimenko
Toth, Imre; Lamy, Philippe L.; Gutiérrez, Pedro +5 more
In 2003, comet 67P/Churyumov-Gerasimenko was selected as the new target of the Rosetta mission as the most suitable alternative to the original target, comet 46P/Wirtanen, on the basis of orbital considerations even though very little was known about the physical properties of its nucleus. In a matter of a few years and based on highly focused obs…
D/H and Nearby Interstellar Cloud Structures
Linsky, J. L.
Analysis of UV spectra obtained with the HST, FUSE and other satellites provides a new understanding of the deuterium abundance in the local region of the galactic disk. The wide range of gas-phase D/H measurements obtained outside of the Local Bubble can now be explained as due to different amounts of deuterium depletion on carbonaceous grains. T…