Thermophysical properties of near-Earth asteroid (341843) 2008 EV5 from WISE data

Bibcode
2014A&A...561A..45A
DOI
10.1051/0004-6361/201322215
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
Astronomy and Astrophysics
Number of authors
6
IAC number of authors
2
Citations
31
Refereed citations
30
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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