Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..585p&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.585
Physics
Scientific paper
The Deep Impact eXtended Investigation (DIXI) to comet 103P/Hartley 2 culminated in a closest approach of 700km on November 4th, 2010 [1]. Spatially resolved near-infrared spectra of the cometary coma have been acquired in the wavelength range 1.05-4.85 μm using the High Resolution Instrument Infrared Spectrometer (HRI-IR) [2, 3]. At closest approach, the relative reflectance spectra extracted in the coma present clear absorption bands near 1.5, 2.0, and 3.0 μm, characteristic of water ice [4]. The modeling analysis based on the Hapke radiative transfer model [5] suggests micron size pure icy grains, in areal mixture with refractory impurities. The spatial map of H2O ice indicates that the icy grains are not uniformly distributed in the coma. The size distribution of the icy grains in the coma of Hartley 2, as determined by the HRI-IR data analysis, will be presented. We focus on the size variations vs. nucleocentric distance along the jets in order to shed light on the mechanisms that govern the ambient coma.
A'Hearn Michael F.
Besse Sebastien
Farnham Tony L.
Feaga Lori M.
Groussin Olivier
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