Lect2 Comet Nucleus, Coma, Tails (10-29-09)

Lect2 Comet Nucleus, Coma, Tails (10-29-09) - Nucleus, Coma...

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Unformatted text preview: Nucleus, Coma and Tails (Sections I, II, III in Comet Chapter in Encyclopedia) 10-29-09 Outline of Comet Chapter in Encyclopedia I. Introduction II. Nucleus III. Coma IV. Plasma Tails V. Dust Tails VI. Molecular and Elemental Abundances VII. Meteoroid Streams VIII. Hazards of Cometary Impacts (Read Sections IV, V and VI by Tue Nov. 3 and outline of IV-VIII due by Thurs. Nov. 5) I. Intro: Mostly covered in last lecture . I. Nucleus Organic and silicate grains Non-gravitational forces Supposedly hyperbolic comets Surface of nucleus is mostly inactive: mantle (crust) covers most of the surface Low albedo of comet nucleus: mixtures of ice and low albedo dust => very low albedo Density comet nucleus 0.2-1.2 of H 2 O- Halley 0.5-1.1 of H 2 O SL9 (New results since then, mainly 9P/Tempel 1, are in the same range) . I. Nucleus Continued Nucleus structure: weakly bound aggregate Nucleus splitting and outbursts (1999 S4 Linear, see next page) Possible alteration process:...
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This note was uploaded on 11/09/2009 for the course AST 4142 taught by Professor Campins during the Fall '09 term at University of Central Florida.

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Lect2 Comet Nucleus, Coma, Tails (10-29-09) - Nucleus, Coma...

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