Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..269k&link_type=abstract
Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 269-271.
Astronomy and Astrophysics
Astronomy
55
Astronomical Spectroscopy, Comet Nuclei, Halley'S Comet, Spectrometers, Vega Project, Cosmic Dust, Cosmochemistry, Hydroxyl Emission, Infrared Spectra, Water, Comets, Halley, Spacecraft Observations, Mission Description, Experiments, Spectroscopy, Vega 2, Tks, Three-Channel Spectrometer, Infrared, Spectra, Wavelengths, Visible Light, Comet Nuclei, Water, Hydroxyl Radical, Dust, Particles, Production Rate, Density, Emissions, Molecules, Procedure
Scientific paper
The three-channel spectrometer aboard the Vega 2 spacecraft recorded infrared and visible spectra near the nucleus of comet Halley. Spectra in the range 0.95-1.9 micron at a distance of 300 km from the nucleus reveal the H2O 1.38 micron band and OH band, the latter excited by dissociation of a parent molecule. Their production rates are 4 x 10 to the 29th and 1.7 x 10 to the 30th molecules/s respectively. The dust particle density is 0.35 g/cu cm, typical of fluffy particles of interplanetary dust. Emissions of 10 species are observed in the 275-715 nm range at about 4000 km from the nucleus, and six of them are analyzed in terms of production rates. In molecules/s, it is found that: Q(OH) = 2 x 10 to the 30th, Q(CH) = 10 to the 29th, Q(C2) = 6 x 10 to the 27th, Q(CN) = 10 to the 27th, and Q(NH) = 2 x 10 to the 26th.
Bertaux Jean Loup
Blamont E. J. E. J.
Clairemidi Jacques
Gogoshev M. M.
Gogosheva Ts.
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