The Dust in the Coma of Comet Halley
نویسندگان
چکیده
منابع مشابه
Monte Carlo modeling of neutral gas and dust in the coma of Comet 1P/Halley
The neutral gas environment of a comet is largely influenced by dissociation of parent molecules created at the surface of the comet and collisions of all the involved species. We compare the results from a kinetic model of the neutral cometary environment with measurements from the Neutral Mass Spectrometer and the Dust Impact Detection System onboard the Giotto spacecraft taken during the fly...
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Broadband charge-coupled device photomet ry of Comet p/Halley at heliocentric d is tances R = 5.9 A U (1984 October) and R = 5.1 A U (1985 January) is presented. The mean brightness at R = 5.1 A U is greater than expected from an asteroidal br ightness model fitted to earlier photometry . It is likely that this br ightness increase is due to the release of dus t grains from the nucleus beginnin...
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Methane and ammonia abundances in the coma of Halley are derived from Giotto IMS data using an Eulerian model of chemical and physical processes inside the contact surface to simulate Giotto HIS ion mass spectral data for mass-to-charge ratios (m/q) from 15 to 19. The ratio m/q = 19/18 as a function of distance from the nucleus is not reproduced by a model for a pure water coma. It is necessary...
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The Distributed Co in Comet Halley
Examination of the spatial distribution of CO intensity of Comet Halley indicates that a large fraction of CO originates from the refractory organic component in the coma, rather than directly from the volatiles in the nucleus. Based on the fluffy aggregate interstellar dust comet model, we have estimated the upper limits of the total amount of CO provided by coma dust. The implications from th...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1991
ISSN: 0252-9211
DOI: 10.1017/s0252921100066914