Search for methane in Comet Halley

Details Search for methane in Comet Halley Search for methane in Comet Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.347d&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 347-352 (SEE N87

Physics

5

Abundance, Halley'S Comet, Infrared Spectroscopy, Methane, Airborne Equipment, Fluorescence, Temperature Measurement

Scientific paper

A search for gaseous neutral CH4 has been conducted in the coma of comet Halley on March 20, 1986 using a Fourier Transform Spectrometer on the NASA Kuiper Airborne Observatory. In the field-of-view (41arcsecdiam. = 24,000 km) the CH4 rotational temperature is equal to the kinetic temperature of the coma molecules due to collisions in most of the region and is frozen in at the outer edge. The spectrum of the υ3 band is due to fluorescence with the R(3) to R(5) lines being most suitable for Earth-based observations. Measured upper (3σ) limits of ≡4×10-19W cm-2 for these lines lead to an (7σ) upper limit of 4×1028CH4 molecules per second. This value corresponds to ≡4% of the water vapor production rate at the time of observation.

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