title: Deep Impact: excavating comet Tempel 1.
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.
authors.affiliation: University of Maryland, College Park, MD 20742, USA. ma@astro.umd.edu
authors.forename: M F
authors.initials: MF
authors.lastname: A'Hearn
authors.forename: M J S
authors.initials: MJ
authors.lastname: Belton
authors.forename: W A
authors.initials: WA
authors.lastname: Delamere
authors.forename: J
authors.initials: J
authors.lastname: Kissel
authors.forename: K P
authors.initials: KP
authors.lastname: Klaasen
authors.forename: L A
authors.initials: LA
authors.lastname: McFadden
authors.forename: K J
authors.initials: KJ
authors.lastname: Meech
authors.forename: H J
authors.initials: HJ
authors.lastname: Melosh
authors.forename: P H
authors.initials: PH
authors.lastname: Schultz
authors.forename: J M
authors.initials: JM
authors.lastname: Sunshine
authors.forename: P C
authors.initials: PC
authors.lastname: Thomas
authors.forename: J
authors.initials: J
authors.lastname: Veverka
authors.forename: D K
authors.initials: DK
authors.lastname: Yeomans
authors.forename: M W
authors.initials: MW
authors.lastname: Baca
authors.forename: I
authors.initials: I
authors.lastname: Busko
authors.forename: C J
authors.initials: CJ
authors.lastname: Crockett
authors.forename: S M
authors.initials: SM
authors.lastname: Collins
authors.forename: M
authors.initials: M
authors.lastname: Desnoyer
authors.forename: C A
authors.initials: CA
authors.lastname: Eberhardy
authors.forename: C M
authors.initials: CM
authors.lastname: Ernst
authors.forename: T L
authors.initials: TL
authors.lastname: Farnham
authors.forename: L
authors.initials: L
authors.lastname: Feaga
authors.forename: O
authors.initials: O
authors.lastname: Groussin
authors.forename: D
authors.initials: D
authors.lastname: Hampton
authors.forename: S I
authors.initials: SI
authors.lastname: Ipatov
authors.forename: J-Y
authors.initials: JY
authors.lastname: Li
authors.forename: D
authors.initials: D
authors.lastname: Lindler
authors.forename: C M
authors.initials: CM
authors.lastname: Lisse
authors.forename: N
authors.initials: N
authors.lastname: Mastrodemos
authors.forename: W M
authors.initials: WM
authors.lastname: Owen
authors.forename: J E
authors.initials: JE
authors.lastname: Richardson
authors.forename: D D
authors.initials: DD
authors.lastname: Wellnitz
authors.forename: R L
authors.initials: RL
authors.lastname: White
mesh_terms: D018538:Jupiter; D019110:Meteoroids; D009930:Organic Chemicals / Q000032:analysis; D013057:Spectrum Analysis
chemical_list: D009930:Organic Chemicals