Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Model for Cameron band emission in comets: A case for EPOXI mission
  target comet 103P/Hartley 2   The CO2 production rate has been derived in comets using the Cameron band
(a3Pi - X1Sigma) emission of CO molecule assuming that photodissociative
excitation of CO2 is the main production mechanism of CO in a3Pi metastable
state. We have devoloped a model for the production and loss of CO(a3Pi) which
has been applied to comet 103P/Hartley 2: the target of EPOXI mission. Our
model calculations show that photoelectron impact excitation of CO and
dissociative excitation of CO2 can together contribute about 60-90% to the
Cameron band emission. The modeled brightness of (0-0) Cameron band emission on
comet Hartley 2 is consistent with Hubble Space Telescope observations for 3-5%
CO2 (depending on model input solar flux) and 0.5% CO relative to water, where
photoelectron impact contribution is about 50-75%. We suggest that estimation
of CO2 abundances on comets using Cameron band emission may be reconsidered. We
predict the height integrated column brightness of Cameron band of ~1300 R
during EPOXI mission encounter period.

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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: cond-mat