Comet Observations by OSIRIS onboard the Rosetta Spacecraft

Details Comet Observations by OSIRIS onboard the Rosetta Spacecraft Comet Observations by OSIRIS onboard the Rosetta Spacecraft

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..10e..29k&link_type=abstract

Progress in Planetary Exploration Missions, 26th meeting of the IAU, Joint Discussion 10, 21-22 August 2006, Prague, Czech Repub

Computer Science

Performance

Scientific paper

After the delayed launch of Rosetta in March 2004 the first opportunity to observe a comet arose already during the commissioning period in late April 2004. The dust coma of comet 2002 T7 (Linear) was observed by the NAC, the narrow angle imager of the two scientific cameras, from a distance of 0.66 AU. A second chance came about when comet 2004 Q2 (Machholz) came as close as 0.44 AU in January 2005 while its heliocentric distance was 1.21 AU. Here also the WAC (wide angle camera) could be used to observe the OH and CN emissions in addition to the dust. These targets allowed us to test and demonstrate the excellent performance of the scientific imagers. The continuous observations of comet 9P/Tempel 1 in July 2005 for about three weeks yielded a major contribution to the analysis of the Deep Impact events. The total amounts of water, CN, and sodium produced by the impact of the projectile were determined. The amount of dust and its outflow velocity distribution could also be deduced from the images. The impact was covered with a time resolution of ~40 s for the first 90 min. After introducing the OSIRIS camera system and its performance we will report on the scientific results with particular emphasis on a summary of the Tempel 1 observations. The OSIRIS consortium comprises ca. 50 scientists. OSIRIS was built by contributions of institutes from Germany, France, Italy, Spain, Sweden, and ESA. The support of the national funding agencies of Germany (DLR), France (CNES), Italy (ASI), Sweden (SNSB), and Spain is gratefully acknowledged.

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