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24 April 2024 |
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A Distribution of Large Particles in the Coma of Comet 103P/Hartley 2 | | Michael S. Kelley
; Don J. Lindler
; Dennis Bodewits
; Michael F. A'Hearn
; Carey M. Lisse
; Ludmilla Kolokolova
; Jochen Kissel
; Brendan Hermalyn
; | | Date: |
15 Apr 2013 | | Abstract: | The coma of comet 103P/Hartley 2 has a significant population of large
particles observed as point sources in images taken by the Deep Impact
spacecraft. We measure their spatial and flux distributions, and attempt to
constrain their composition. The flux distribution of these particles implies a
very steep size distribution with power-law slopes ranging from -6.6 to -4.7.
The radii of the particles extend up to 20 cm, and perhaps up to 2 m, but their
exact sizes depend on their unknown light scattering properties. We consider
two cases: bright icy material, and dark dusty material. The icy case better
describes the particles if water sublimation from the particles causes a
significant rocket force, which we propose as the best method to account for
the observed spatial distribution. Solar radiation is a plausible alternative,
but only if the particles are very low density aggregates. If we treat the
particles as mini-nuclei, we estimate they account for <16-80% of the comet’s
total water production rate (within 20.6 km). Dark dusty particles, however,
are not favored based on mass arguments. The water production rate from bright
icy particles is constrained with an upper limit of 0.1 to 0.5% of the total
water production rate of the comet. If indeed icy with a high albedo, these
particles do not appear to account for the comet’s large water production rate. | | Source: | arXiv, 1304.4204 | | Services: | Forum | Review | PDF | Favorites | |
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