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Submitted on August 18, 2005
Accepted on September 1, 2005
Deep Impact Observations by OSIRIS Onboard the Rosetta Spacecraft
Horst Uwe Keller 1*, Laurent Jorda 2, Michael Küppers 1, Pedro J. Gutierrez 3, Stubbe F. Hviid 1, Jörg Knollenberg 4, Luisa-Maria Lara 3, Holger Sierks 1, Cesare Barbieri 5, Philippe Lamy 2, Hans Rickman 6, Rafael Rodrigo 3
1 Max-Planck Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany. 2 Laboratoire d’Astrophysique de Marseille, BP 8, 13376 Marseille Cedex, France. 3 Instituto de Astrofísica de Andalucía-CSIC, C/ Camino Bajo de Huétor, 50, 18008 Granada, Spain. 4 DLR Institut für Planetenforschung, Rutherfordstrasse 2, 12489 Berlin, Germany. 5 Dipartimento di Astronomia e CISAS, Università di Padova, Vicolo dell'Osservatorio 5, 35100 Padova, Italy. 6 Uppsala Astronomical Observatory, Box 515, 75120 Uppsala, Sweden.
* To whom correspondence should be addressed.
Horst Uwe Keller , E-mail: keller{at}mps.mpg.de
The OSIRIS cameras onboard ESA’s Rosetta spacecraft observedcomet 9P/Tempel 1 around the time of NASA’s Deep Impactmission for 17 days continuously. The CN to H2O production ratiowas slightly enhanced in the impact cloud compared to that ofnormal comet activity. Dust particles were flowing outward inthe coma at >160 m/s, accelerated by the gas. The slope ofthe brightness increase showed a dip about 200 s after the impact.Dust Af values before and long after the impact confirm theslight decrease of cometary activity. The dust to water massratio is much larger than 1.
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