Mass and Local Topography Measurements of Itokawa by Hayabusa
Abstract
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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Supported by ISAS/JAXA through the Hayabusa mission. We are extremely grateful for the numerous engineers and supporting scientists who were critical to the successful development and execution of the first mission that rendezvoused with and landed on an asteroid. We thank E. Okumura and K. Tsuno (NEC Toshiba Space Systems, Ltd.) for their great efforts to develop the LIDAR. This work is partly supported by the 21st Century COE Program “Origin and Evolution of Planetary Systems” under the Ministry of Education, Culture, Sports, Science, and Technology (MEXT).
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Science
Volume 312 | Issue 5778
2 June 2006
2 June 2006
Copyright
American Association for the Advancement of Science.
Submission history
Received: 15 February 2006
Accepted: 21 April 2006
Published in print: 2 June 2006
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