Mass and Local Topography Measurements of Itokawa by Hayabusa

Details Mass and Local Topography Measurements of Itokawa by Hayabusa Mass and Local Topography Measurements of Itokawa by Hayabusa

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sci...312.1344a&link_type=abstract

Science, Volume 312, Issue 5778, pp. 1344-1349 (2006).

Computer Science

41

Scientific paper

The ranging instrument aboard the Hayabusa spacecraft measured the surface topography of asteroid 25143 Itokawa and its mass. A typical rough area is similar in roughness to debris located on the interior wall of a large crater on asteroid 433 Eros, which suggests a surface structure on Itokawa similar to crater ejecta on Eros. The mass of Itokawa was estimated as (3.58 +/- 0.18) × 1010 kilograms, implying a bulk density of (1.95 +/- 0.14) grams per cubic centimeter for a volume of (1.84 +/- 0.09) × 107 cubic meters and a bulk porosity of ~40%, which is similar to that of angular sands, when assuming an LL (low iron chondritic) meteorite composition. Combined with surface observations, these data indicate that Itokawa is the first subkilometer-sized small asteroid showing a rubble-pile body rather than a solid monolithic asteroid.

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