Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p21c..07c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P21C-07
Other
[5410] Planetary Sciences: Solid Surface Planets / Composition, [5422] Planetary Sciences: Solid Surface Planets / Ices
Scientific paper
We have conducted a statistical clustering analysis (1,2) on a mosaic of VIMS data cubes obtained on February 13, 2010, for Saturn’s satellite Mimas. Seven VIMS cubes were geometrically projected and re-sampled to a common spatial resolution. The clustering technique consists of a partitioning algorithm coupled to a criterion that prevents sub-optimal solutions and tests for the influence of random noise in the measurements. The clustering technique is agnostic about the meaning of the clusters, and scientific interpretation requires their a posteriori evaluation. The preliminary results yielded five clusters, demonstrating that spectral variability across Mimas’ surface is statistically significant. The ratios of the means calculated for each of the clusters show structure within the 1.6-µm water ice band, as well as the shape and the central wavelength of the strong ice band at 2 µm, that map spatially in patterns apparently related to the topography of Mimas, in particular certain regions in and around Herschel crater. The mean spectra of the five clusters, show similarities (band shape and central wavelength) with lab spectra of amorphous and crystalline H2O ice (3) that are suggestive of the presence of an amorphous (or “disordered”) ice component in certain regions of Mimas, notably on the central peak of Herschel, on the crater floor, and in faults surrounding the crater. Mimas is too warm to sustain H2O ice in a possibly original amorphous form for the great age of the surface, and its appearance may represent a mixture of both ice phases, or perhaps a layer of disordered ice on a base of crystalline ice. Another possible occurrence of non-crystalline ice appears southwest of Herschel, close to the south pole. (1) Marzo, G. A. et al. J. Geophys. Res. 111, E03002, 2006. (2) Marzo, G. A. et al. J. Geophys. Res. 113, E12009, 2008. (3) Mastrapa, R. M., et al. Astrophys. J. 701, 1347-1356, 2009.
Baines Kevin Hays
Brown Harvey R.
Buratti Bonnie Jean
Cassini Vims Team
Clark Roger Nelson
No associations
LandOfFree
Mimas: Preliminary Evidence For Amorphous Water Ice From VIMS (Invited) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mimas: Preliminary Evidence For Amorphous Water Ice From VIMS (Invited), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mimas: Preliminary Evidence For Amorphous Water Ice From VIMS (Invited) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1495684