Bibcode
Delbo, M.; Gundlach, B.; Lionni, L.; Alí-Lagoa, V.; Licandro, J.; Blum, J.
Bibliographical reference
Astronomy and Astrophysics, Volume 561, id.A45, 8 pp.
Advertised on:
1
2014
Journal
Citations
33
Refereed citations
32
Description
Aims: We derive the thermal inertia of 2008 EV5, the
baseline target for the Marco Polo-R mission proposal, and infer
information about the size of the particles on its surface.
Methods: Values of thermal inertia were obtained by fitting an asteroid
thermophysical model to NASA's Wide-field Infrared Survey Explorer
(WISE) infrared data. Grain size was derived from the constrained
thermal inertia and a model of heat conductivity that accounts for
different values of the packing fraction (a measure of the degree of
compaction of the regolith particles). Results: We obtain an
effective diameter D = 370 ± 6 m, geometric visible albedo
pV = 0.13 ± 0.05 (assuming H = 20.0 ± 0.4), and
thermal inertia Γ = 450 ± 60 J m-2
s-1/2 K-1 at the 1σ level of significance
for its retrograde spin-pole solution. The regolith particles radius is
r = 6.6+1.3-1.3 mm for low degrees of compaction
and r = 12.5+2.7-2.6 mm for the highest packing
densities.
Table of observed fluxes is only available at the CDS via anonymous ftp
to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/561/A45
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