Near infrared spectroscopy of Comet Halley by the Vega-2 three channel spectrometer

Details Near infrared spectroscopy of Comet Halley by the Vega-2 three channel spectrometer Near infrared spectroscopy of Comet Halley by the Vega-2 three channel spectrometer

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.459k&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 459-463 (SEE N87

Computer Science

5

Cosmic Dust, Cyano Compounds, Halley'S Comet, Hydroxyl Radicals, Infrared Spectroscopy, Near Infrared Radiation, Vega Project, Water Vapor, Particle Density (Concentration), Scattering Coefficients, Velocity Distribution, Vibrational Spectra

Scientific paper

Continuum radiation produced by cometary dust scattering, the water vapor band at 1.38 microns, OH rovibrational bands, and the CN (0,0) band at 1.1 microns are discussed. Dust production rate equals 14 tonne/sec with angular distribution proportional to cos phi superposed by ejection in a cone of 25 deg. Dust material density p = 0.63 a μm g/cc where a μm is the particle radius in microns. Dust scattering spectrum in the range of 0.25 to 2 microns is discussed. Intensities of the H2O band at 1.38 microns are 0.2 MR and 1.3 MR at phase angle 90 and 35 deg respectively. Its angular distribution is narrower than that of dust with more pronounced jets. Velocities of gas and dust equal 0.85 + or - 0.15 km/sec and sq rt 0.54 (p a μm) km/sec respectively. Spatial distribution of CN bands demonstrates existence of a second parent with scale length of 600 km at 1 AU and production rate 20% of that of HCN.

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