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Observations of CN and dust activity of comet P/Tempel 1 around Deep Impact

Rauer, Heike and Weiler, Michael and Sterken, Christiaan and Jehin, Emmanuël and Knollenberg, Jörg and Hainauf, O. (2006) Observations of CN and dust activity of comet P/Tempel 1 around Deep Impact. Astronomy and Astrophysics, 459, pp. 257-263. EDP Scienes. DOI: 10.1051/0004-6361:20065512 ISSN 0004-6361

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We present observations of CN emission and the scattered solar light on cometary dust particles around the impact time of the Deep Space spacecraft (NASA) into the nucleus of comet P/Tempel 1. The purpose of the observations was to compare post-impact activity to the conditions pre-impact to search for new spectral emission lines after impact, to quantify the increase in gas activity due to the impact and to study the long-term activity changes. We performed long-slit spectroscopy observations of comet P/Tempel 1 at the VLT, ESO, using the FORS instruments from July 2 to July 12, 2005. A wavelengths range of 370 - 920 nm was covered using two grisms. Four different position angle settings of the slit were applied each night with the projected Sun-comet line as standard setting, for which we report results here. The optical spectra of comet P/Tempel 1 showed the usual emission bands in the optical wavelengths range of the radicals: CN, C<sub>3</sub>, C<sub>2</sub> and NH<sub>2</sub>. No new emission bands were detected after impact. The ejecta cloud of gas and dust caused by the impacting spacecraft into the cometary nucleus could be followed over the observing period. The projected expansion velocities have been determined. The night after impact we observed about 3.9 ± 1.2x10<sup>29</sup> molecules of the CN parent in the ejected cloud. However, after five days the appearance of the gas and dust coma was back to pre-impact conditions.

Item URL in elib:https://elib.dlr.de/43619/
Document Type:Article
Title:Observations of CN and dust activity of comet P/Tempel 1 around Deep Impact
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sterken, ChristiaanVrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, BelgiumUNSPECIFIED
Jehin, EmmanuëlEuropean Southern Observatory, Alonso de Cordova 3107, Santiago de ChileUNSPECIFIED
Hainauf, O.European Southern Observatory, Alonso de Cordova 3107, Santiago de ChileUNSPECIFIED
Date:25 April 2006
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1051/0004-6361:20065512
Page Range:pp. 257-263
Publisher:EDP Scienes
Keywords:comets, Deep Impact, Tempel 1
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Extrasolare Planeten (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Hedelt, Pascal
Deposited On:02 Jan 2007
Last Modified:14 Jan 2010 23:17

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