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IUE observations of H Lyman-α in comet P/Giacobini-Zinner

Feldman, Paul D.; Combi, Michael R.

Comet P/Giacobini-Zinner (1985 XIII) was observed during the flyby of the International Cometary Explorer (ICE) satellite and during the 3 preceding months by the International Ultraviolet Explorer (IUE) satellite. Models for the hydrogen abundance and spatial distribution, which were previously used to reproduce the observed spatial distribution …

Pluto's extended atmosphere: An escape model and initial observations

Stern, S. A.; Clarke, John T.; Trafton, Laurence M.

We have calculated the rates of production and hydrodynamic outflow of atomic hydrogen resulting from the photodissociation of methane in the upper atmosphere of Pluto. Under the present near-perihelion conditions this yields an extended cloud of H around Pluto which is likely to be the most easily observable signature of Pluto's extended atmosphe…