Far-Ultraviolet Observations of Comet 2P/Encke at Perihelion

Details Far-Ultraviolet Observations of Comet 2P/Encke at Perihelion Far-Ultraviolet Observations of Comet 2P/Encke at Perihelion

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...564.1054r&link_type=abstract

The Astrophysical Journal, Volume 564, Issue 2, pp. 1054-1060.

Astronomy and Astrophysics

Astronomy

6

Comets: Individual: Name: 2P/Encke, Ultraviolet: Solar System

Scientific paper

Comet 2P/Encke was observed with UVCS/SOHO near perihelion (2000 September 9 and 11) in the Lyman lines of hydrogen. We present a Lyα image reconstructed from a series of long-slit spectra, along with the intensity ratios of Lyα, Lyβ, and Lyγ. The narrow Lyα profile indicates that the observed photons are scattered from hydrogen atoms produced by dissociation of H2O and OH, though a broader profile far from the coma suggests a contribution from hydrogen atoms produced by charge transfer with solar wind protons. The outgassing rate derived from the Lyα intensity distribution is in excellent agreement with Sekanina's model of two active vents. We also present upper limits for the outgassing rates of the noble gases helium, neon, and argon.

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