The ultraviolet spectrum of Comet Seargent 1978m

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Comets, Emission Spectra, Satellite Observation, Ultraviolet Spectra, H Lines, Hydroxyl Radicals, Iue, Spaceborne Astronomy, Carbon Monosulfide, Carbon Monoxide, Emissions, Ultraviolet, Spectrum, Seargent, Comet, Observations, Comets, Wavelengths, Carbon Dioxide, Absorption Spectra, Lyman-Alpha Radiation

Scientific paper

UV spectrograms of Comet Seargent (1978m) have been obtained with the IUE satellite in the low- (1.8-nm) and high- (0.1-nm) dispersion modes. In the long-wavelength region (189-340 nm) emission bands of OH, CS, CO2(+), NH, and CO(+) can be identified, and the rotational structure of OH could clearly be resolved. In the short-wavelength region (119-192 nm) emission lines of H(Lyman-alpha), O I, C I, and S I appear. These observations demonstrate that the IUE observatory can effectively be used to obtain high-quality spectra of comets as faint as ninth magnitude.

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