Results 211 to 220 of about 549,270 (251)

Origin of Comet Nuclei and Dynamics

Space Science Reviews, 2007
We present a review of the main physical features of comet nuclei, their birthplaces and the dynamical processes that allow some of them to reach the Sun’s neighborhood and become potentially detectable. Comets are thought to be the most primitive bodies of the solar system although some processing—for instance, melting water ice in their interiors and
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Spectral Diversity among the Nuclei of Comets

Icarus, 1993
Abstract The spectral characteristics of cometary nuclei are poorly known. To help rectify this situation, we have been obtaining spectra of cometary nuclei when they are favorably located, i.e., sufficiently far from the Sun that little cometary activity remains.
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On the visibility of nuclei of dusty comets

Icarus, 1981
Abstract The problem of visibility of a cometary nucleus discussed in general terms for single scattering by dust grains. The ratio of radiatio scattered in the dust column above the surface and that reflected from the nucleus determines the visibility of features on the nuclear surface.
R. Hellmich, H.U. Keller
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MASS FLUX OF ASTEROIDAL ORIGIN METEOROIDS ON PERIODIC COMET NUCLEI

Earth, Moon, and Planets, 2004
We examine the potential contamination of cometary nuclei through impacts from asteroidal origin meteoroids. The paper uses a simple model and has the goal of determining whether asteroidal contamination is potentially significant. We assume a meteoroid power law mass distribution with index values in the range from s=1.83 to s=2.09.
R. L. Hawkes, R. A. Eaton
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Probing the internal structure of the nuclei of comets

Planetary and Space Science, 2009
There is no direct evidence about the internal structure of cometary nuclei, which are mostly hidden by their gas and dust comae, and have not yet been orbited by any spacecraft. Their densities are low, typically of about 400 kg m−3 for 9P/Tempel 1 (that was impacted by the Deep Impact probe) and 67P/Churyumov–Gerasimenko (that is the target of the ...
Levasseur-Regourd, Anny Chantal, Hadamcik, Edith, Desvoivres, E., Lasue, Jérémie   +3 more
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Heat of solution: A new source of thermal energy in the subsurface of cometary nuclei and the gas-exsolution mechanism driving outbursts of Comet 29P/Schwassmann‒Wachmann and other comets

, 2016
R. Miles
semanticscholar   +1 more source

Searching for the source of short-period comet nuclei: The direction of the spatial migration of comets

, 2012
A. Kazantsev
semanticscholar   +1 more source

The influence of CO ice on the activity and near-surface differentiation of comet nuclei

, 1990
F. Fanale, J. R. Salvail
semanticscholar   +1 more source

Thermal and Chemical Evolution of Comet Nuclei and Kuiper Belt Objects

, 2008
D. Prialnik, G. Sarid, E. D. Rosenberg, R. Merk   +3 more
semanticscholar   +1 more source

Unveiling Comet Nuclei Surface Spectra: Validating a Coma Subtraction Technique for IFU Comet Observations

Cometary nuclei preserve clues to our early solar system and spectroscopic studies of both their surfaces and surrounding comae—clouds of gas and dust that activate during solar approach—offer critical insight into their composition and evolution. Specifically, cometary surface spectra reveal the materials present on the object’s outermost layers ...
Aren Beck, Charles Schambeau, Yan Fernandez   +2 more
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