Spectroscopic observations of Comet Halley at wavelengths 275 to 710 NM from VEGA 2

Details Spectroscopic observations of Comet Halley at wavelengths 275 to 710 NM from VEGA 2 Spectroscopic observations of Comet Halley at wavelengths 275 to 710 NM from VEGA 2

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.451m&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 451-456 (SEE N87

Physics

2

Halley'S Comet, Optical Emission Spectroscopy, Ultraviolet Spectroscopy, Vega Project, Albedo, Cosmic Dust, Hydroxyl Radicals, Neutral Gases

Scientific paper

During the Vega 2 observation sessions, a total of 3600 spectra of comet Halley in the range 275 - 710 nm were obtained with the NUVI channel of TKS instrument. A scanning system allowed to explore a field of view of 2°×1°.5. The spectra obtained at the end of the encounter session show that, when the impact parameter was minimum, p = 120 km, the gaseous emissions were still present superposed to an intense continuum. The intensities of the OH, CN, C3 and C2 emissions and dust continuum show different evolutions when the impact parameter decreases from 5000 to 120 km. The emissions of OH at 309 nm and CN in the band head at 388 nm are relatively flat. C2 and C3 increase during the approach. Monochromatic charts obtained on March 10, 1986 are presented for the OH, CN and C2 emissions. The spectral characteristics of dust albedo when p decreases are pointed out. The OH intensity curve as a function of p is presented.

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