Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..122c&link_type=abstract
Nature (ISSN 0028-0836), vol. 310, July 12, 1984, p. 122-124.
Astronomy and Astrophysics
Astronomy
27
Astronomical Spectroscopy, Comets, Molecular Spectra, Visible Spectrum, Formyl Ions, Hydrogen Sulfide, Magnetohydrodynamic Waves, Spatial Resolution, Comets, Iras-Araki-Alcock, Spectra, Light (Visible Radiation), Astronomy, Spectroscopy, Photography, Telescopic Observations, Comae, Composition, Inclination, Comet Nuclei, Spectrographs, Analysis, Molecules, Rotation
Scientific paper
Photographic and spectroscopic plates of comet IRAS-Araki-Alcock were obtained on 9.9 UT May 1983 using the 90-cm Schmidt and the 182-cm Copernicus telescopes at the Asiago Observatory. On the spectroscopic plates taken with the grating spectrograph in the spectral range 3,800 - 8,500 Å with a resolution of 6 Å, 450 lines can be distinguished, although 90 lines are still unidentified. The authors have identified the molecules HCO and H2S+ which have never before been observed in the visible part of the spectrum of any astronomical object. They suspect that H2CO, DCO, S2 and NH4 are also present.
Cosmovici Cristiano B.
Ortolani Sergio
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