Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jhu..reptq....f&link_type=abstract
Final Report Johns Hopkins Univ., Baltimore, MD. Dept. of Physics.
Physics
Comets, Emission Spectra, Flyby Missions, Space Missions, Ultraviolet Spectroscopy, Fluorescence, Hubble Space Telescope, Ion Density (Concentration), Lyman Spectra, Wavelengths
Scientific paper
Ultraviolet spectra fo the comet West obtained by sounding rocket experiments in 1976 are reproduced and interpreted in order to estimate the expected brightness of the emission features and determine the spatial extent of these features for the proposed Halley Flyby/Tempel 2 rendezvous and the possible Halley or Encke flybys close to perihelion. A coma model was constructed and evaluated for the physical condition of candidate targets such as heliocentric distance, gas production, and composition. In addition to brightness profiles, the neutral and ion densities of the principal species are also dervied. The brightness profiles can be used to determine the feasibility of utilizing the space telescope to provide supporting observations during the mission. Basic parameters identified are spectral range, wavelength resolution, spatial resolution, sensitivity and dynamic range, rejection of scattered light, and integration or accumulation time.
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