Spectrophotometric Observations of Comet P/Giacobini-Zinner

Details Spectrophotometric Observations of Comet P/Giacobini-Zinner Spectrophotometric Observations of Comet P/Giacobini-Zinner

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arcn.rept..103k&link_type=abstract

Analysis of Returned Comet Nucleus Samples, Proceedings of a Workshop held at Milpitas, California, 16-18 January, 1989. Compil

Astronomy and Astrophysics

Astronomy

Giacobini-Zinner Comet, Spectrophotometry, Astronomical Observatories, Molecules, Emission Spectra, Water, Chemical Composition, Spatial Distribution, Particle Density (Concentration), International Sun Earth Explorer 3, Monte Carlo Method, Carbon Compounds, Amino Radical, Brightness

Scientific paper

Spectrophotometric observations of Comet P/Glacobini-Zinner were obtained in March, June, September, and October 1985. The September observations were obtained at perihelion, exactly at the time of the International Cometary Explorer (ICE) encounter with the comet. Spatial profiles extracted from the long-slit spectra were analyzed by using a Monte Carlo method to determine scale lengths and lifetimes for the observed radicals, C2 and NH2, and their respective parent molecules. The scale length for the parent of C2 was found to be (7.5 +/- 1.5)x104 km and for the parent of NH2 (2.4 +/- 0.4)x104 km. The brightness profile of C2 and the lifetime of the parent of C2 indicate that C2 probably comes from many different sources which may include C2H4, C2H2, and dust particles. C2 and NH2, were found to be depleted in Giacobini-Zinner relative to an average comet by factors of 10 and 5, respectively. The water production rate was obtained for June, September, and October observations from the measurements of the [O I] 6300 A line. The water production rate at the time of the ICE encounter was found to be 2.4x1028 molecules/s, in good agreement with spacecraft results.

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