| Literature DB >> 16150978 |
M F A'Hearn1, M J S Belton, W A Delamere, J Kissel, K P Klaasen, L A McFadden, K J Meech, H J Melosh, P H Schultz, J M Sunshine, P C Thomas, J Veverka, D K Yeomans, M W Baca, I Busko, C J Crockett, S M Collins, M Desnoyer, C A Eberhardy, C M Ernst, T L Farnham, L Feaga, O Groussin, D Hampton, S I Ipatov, J-Y Li, D Lindler, C M Lisse, N Mastrodemos, W M Owen, J E Richardson, D D Wellnitz, R L White.
Abstract
Deep Impact collided with comet Tempel 1, excavating a crater controlled by gravity. The comet's outer layer is composed of 1- to 100-micrometer fine particles with negligible strength (<65 pascals). Local gravitational field and average nucleus density (600 kilograms per cubic meter) are estimated from ejecta fallback. Initial ejecta were hot (>1000 kelvins). A large increase in organic material occurred during and after the event, with smaller changes in carbon dioxide relative to water. On approach, the spacecraft observed frequent natural outbursts, a mean radius of 3.0 +/- 0.1 kilometers, smooth and rough terrain, scarps, and impact craters. A thermal map indicates a surface in equilibrium with sunlight.Entities:
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Year: 2005 PMID： 16150978 DOI： 10.1126/science.1118923
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728