title: Deep Impact observations by OSIRIS onboard the Rosetta spacecraft.
abstract: The OSIRIS cameras (optical, spectroscopic, and infrared remote imaging system) onboard the European Space Agency's Rosetta spacecraft observed comet 9P/Tempel 1 for 17 days continuously around the time of NASA's Deep Impact mission. The cyanide-to-water production ratio was slightly enhanced in the impact cloud, compared with that of normal comet activity. Dust particles were flowing outward in the coma at >160 meters per second, accelerated by the gas. The slope of the brightness increase showed a dip about 200 seconds after the impact. Dust Afrho values before and long after the impact confirm the slight decrease of cometary activity. The dust-to-water mass ratio was much larger than 1.
authors.affiliation: Max-Planck Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany. keller@mps.mpg.de
authors.forename: Horst Uwe
authors.initials: HU
authors.lastname: Keller
authors.forename: Laurent
authors.initials: L
authors.lastname: Jorda
authors.forename: Michael
authors.initials: M
authors.lastname: Küppers
authors.forename: Pedro J
authors.initials: PJ
authors.lastname: Gutierrez
authors.forename: Stubbe F
authors.initials: SF
authors.lastname: Hviid
authors.forename: Jörg
authors.initials: J
authors.lastname: Knollenberg
authors.forename: Luisa-Maria
authors.initials: LM
authors.lastname: Lara
authors.forename: Holger
authors.initials: H
authors.lastname: Sierks
authors.forename: Cesare
authors.initials: C
authors.lastname: Barbieri
authors.forename: Philippe
authors.initials: P
authors.lastname: Lamy
authors.forename: Hans
authors.initials: H
authors.lastname: Rickman
authors.forename: Rafael
authors.initials: R
authors.lastname: Rodrigo
mesh_terms: D019443:Cosmic Dust; D019110:Meteoroids; D009930:Organic Chemicals / Q000032:analysis; D018531:Spacecraft; D013055:Spectrophotometry, Infrared; D013057:Spectrum Analysis
chemical_list: D019443:Cosmic Dust; D009930:Organic Chemicals