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Dust Impact Monitor (SESAME-DIM) on board Rosetta/Philae: MIllimetric particle flux at comet 67P/Churyumov-Gerasimenko

Hirn, Attila and Albin, Thomas and Apáthy, István and Della Corte, Vincenzo and Fischer, Hans-Herbert and Flandes, Alberto and Loose, Alexander and Péter, Attila and Seidensticker, Klaus J. and Krüger, Harald (2016) Dust Impact Monitor (SESAME-DIM) on board Rosetta/Philae: MIllimetric particle flux at comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 591 (A93), A93/1-A93/7. EDP Sciences. DOI: 10.1051/0004-6361/201628370 ISSN 0004-6361

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Abstract

Context. The Philae lander of the Rosetta mission, aimed at the in situ investigation of comet 67P/Churyumov-Gerasimenko, was deployed to the surface of the comet nucleus on 12 November 2014 at 2.99 AU heliocentric distance. The Dust Impact Monitor (DIM) as part of the Surface Electric Sounding and Acoustic Monitoring Experiment (SESAME) on the lander employed piezoelectric detectors to detect the submillimetre- and millimetre-sized dust and ice particles emitted from the nucleus. Aims. We determine the upper limit of the ambient flux of particles in the measurement range of DIM based on the measurements performed with the instrument during Philae’s descent to its nominal landing site Agilkia at distances of about 22 km, 18 km, and 5 km from the nucleus barycentre and at the final landing site Abydos. Methods. The geometric factor of the DIM sensor was calculated assuming an isotropic ambient flux of the submillimetre- and millimetre-sized particles. For the measurement intervals when no particles were detected the maximum true impact rate was calculated by assuming Poisson distribution of the impacts, and it was given as the detection limit at a 95% confidence level. The shading by the comet environment at Abydos was estimated by simulating the pattern of illumination on Philae and consequently the topography around the lander. Results. Based on measurements performed with DIM, the upper limit of the flux of particles in the measurement range of the instrument was of the order of 10-8−10-7 m-2 s-1 sr-1 during descent. The upper limit of the ambient flux of the submillimetre- and millimetre-sized dust and ice particles at Abydos was estimated to be 1.6 × 10-9 m-2 s-1 sr-1 on 13 and 14 November 2014. A correction factor of roughly 1/3 for the field of view of the sensors was calculated based on an analysis of the pattern of illumination on Philae. Conclusions. Considering particle speeds below escape velocity, the upper limit for the volume density of particles in the measurement range of DIM was constrained to 10-11 m-3−10-12 m-3. Results of the calculations performed with the GIPSI tool on the expected particle fluxes during the descent of Philae were compatible with the non-detection of compact particles by the DIM instrument.

Item URL in elib:https://elib.dlr.de/109353/
Document Type:Article
Title:Dust Impact Monitor (SESAME-DIM) on board Rosetta/Philae: MIllimetric particle flux at comet 67P/Churyumov-Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hirn, AttilaHungarian Academy of Sciences, Budapest, Ungarn & MPI für Sonnesystemforschung, GöttingenUNSPECIFIED
Albin, ThomasUniversität Stuttgart-Ins. für Raumfahrtsysteme, MEdical Radioanto Physics Oldenburg, MPI für Sonnensystemforschung GöttingenUNSPECIFIED
Apáthy, IstvánHungarian Academy of Sciences, Budapest, UngarnUNSPECIFIED
Della Corte, VincenzoInaf-Ips, Roma, ItalyUNSPECIFIED
Fischer, Hans-HerbertDLR-Köln, Hans-Herbert.Fischer (at) dlr.dehttps://orcid.org/0000-0003-4887-3911
Flandes, AlbertoMPI für Sonnensystemforschung, Universidad Nacional Autónoma de MéxicoUNSPECIFIED
Loose, AlexanderMPI für Sonnenystemforschung, GöttingenUNSPECIFIED
Péter, AttilaHungarian Academy of Sciences, Budapest, UngarnUNSPECIFIED
Seidensticker, Klaus J.DLR-Berlin, Klaus.Seidensticker (at) dlr.dehttps://orcid.org/0000-0003-3671-3769
Krüger, HaraldMPI für Sonnensystemforschung, GöttingenUNSPECIFIED
Date:October 2016
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:591
DOI :10.1051/0004-6361/201628370
Page Range:A93/1-A93/7
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:67PChuryumov-Gerasimenki, detectors, data Analysis, numerical
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Asteroids and Comets
Deposited By: Herrmann, Astrid
Deposited On:12 Dec 2016 09:35
Last Modified:31 Jul 2019 20:06

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