[en] The Deep Impact target comet 9P/Tempel 1 was observed by means of long-slit spectroscopy from two nights before impact up to eight nights after impact, using the ESO VLT UT1, UT2, and ESO NTT telescopes. Spectra covering the complete optical wavelength range were obtained, and information at different position angles in the coma was collected. The data were used to study the gas and dust activity of comet 9P/Tempel 1. Gas production rates before and after impact and the amount of material in the impact cloud were determined. The pre-impact Afρ parameter, the dust production rate and the dust-to-gas mass ratio were derived. A variation of the cometary gas activity with rotation of the nucleus was detected. A difference in the variation of the brightness of the CN gas emission band compared to the variation of the emissions by C_2, C_3, and NH_2 in the inner coma suggests compositional differences between different parts of the surface of comet 9P/Tempel 1's nucleus.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Weiler, M.; Institut für Planetenforschung DLR Rutherfordstrasse 2
Rauer, H.; Zentrum für Astronomie und Astrophysik, Technische Universität Berlin
Sterken, C.; Vrije Universiteit Brussel
Knollenberg, J.; Institut für Planetenforschung DLR Rutherfordstrasse 2
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Pompei, E.; European Southern Observatory
Hainaut, O.; European Southern Observatory
Tozzi, G. P.; Arcetri Observatory
Manfroid, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Sterken, C.
Language :
English
Title :
ESO Spectrophotometry of Comet 9P/Tempel 1
Publication date :
2009
Event name :
Deep Impact as a World Observatory Event: Synergies in Space, Time, and Wavelength
Event organizer :
Käufl H.U. and Sterken C.
Event place :
Brussels, Belgium
Event date :
7-10 August 2006
Audience :
International
Main work title :
Deep Impact as a World Observatory Event: Synergies in Space, Time, and Wavelength
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