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Deep Impact Observations by OSIRIS Onboard the Rosetta Spacecraft
Horst Uwe Keller,1*Laurent Jorda,2Michael Küppers,1Pedro J. Gutierrez,3Stubbe F. Hviid,1Jörg Knollenberg,4Luisa-Maria Lara,3Holger Sierks,1Cesare Barbieri,5Philippe Lamy,2Hans Rickman,6Rafael Rodrigo3
The OSIRIS cameras (optical, spectroscopic, and infrared remoteimaging system) onboard the European Space Agency's Rosettaspacecraft observed comet 9P/Tempel 1 for 17 days continuouslyaround the time of NASA's Deep Impact mission. The cyanide-to-waterproduction ratio was slightly enhanced in the impact cloud,compared with that of normal comet activity. Dust particleswere flowing outward in the coma at >160 meters per second,accelerated by the gas. The slope of the brightness increaseshowed a dip about 200 seconds after the impact. Dust Af valuesbefore and long after the impact confirm the slight decreaseof cometary activity. The dust-to-water mass ratio was muchlarger than 1.
1 Max-Planck Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany. 2 Laboratoire d'Astrophysique de Marseille, Boite Postal 8, 13376 Marseille Cedex, France. 3 Instituto de Astrofísica de Andalucía–Consejo Superior de Investigaciones Científicas, C/Camino Bajo de Huétor, 50, 18008 Granada, Spain. 4 Deutsches Zentrum für Luft- und Raumfahrt, Institut für Planetenforschung, Rutherfordstrasse 2, 12489 Berlin, Germany. 5 Dipartimento di Astronomia e Centro Interdipartimentale Studi ed Attività Spaziali "G. Colombo," 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. E-mail: keller{at}mps.mpg.de
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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. 
