%0 Conference Paper %F Oral %T From Rosetta to Museums: The very long journey of cometary dust particles within the zodiacal cloud %+ PLANETO - LATMOS %A Levasseur-Regourd, Anny Chantal %< avec comité de lecture %B Symposium 2018: The Comet-Mission ROSETTA %C Venna, Austria %8 2018-07-12 %D 2018 %Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Conference papers %X Die Kometen-Mission Rosetta / Symposium am 12. Juli 20184/9 KOMMISSION FÜR ASTRONOMIE und KOMMISSION FÜR GEOWISSENSCHAFTEN in Kooperation mit dem NATURHISTORISCHEN MUSEUM WIENFrom Rosetta to Museums The very long journey of cometary dust particles within the zodiacal cloudProf. Dr. Anny-Chantal Levasseur-RegourdUniversität Sorbonne | LATMOS-Institut, Parishttps://www.latmos.ipsl.fr/index.php/en/annuaire?id=3735Anny-Chantal.Levasseur@aerov.jussieu.frThe Rosetta rendezvous mission has established that dust particles in the coma of comet 67P/Churyumov-Gerasimenko (thereafter 67P) are aggregates, with sizes mainly from tens to hundreds of micrometers. They present a hierarchical structure, are built up from a large number of subunits (at least down to tens of nanometers), and may be rather compact or quite fluffy. Rosetta has also provided evidence for the dominance of organic matter in such particles. Their porous structure and carbonaceous composition, in agreement with results tentatively inferred from other comets, are perfectly consistent with the results established for the nucleus of 67P.Cometary dust particles, once released from a cometary nucleus, are subjected to gravitational and non-gravitational forces, which scatter them along cometary dust tails and trails, and progressively inject them into the zodiacal cloud (also called interplanetary dust cloud), where they may slowly spiral inwards during tens of thousands of years, before finally falling into the Sun. It has been recently recognized that most of the interplanetary dust particles reaching the Earth’s environment originate from comets on orbits comparable to that of 67P. Some of these numerous dust particles entering the Earth’s atmosphere may survive their impact, because of their relatively low velocities and their fluffy structure. They have indeed been collected during the last decades, within the stratosphere, as CP-IDPS (Chondritic Porous Interplanetary Dust particles), and from snow and ice of high-altitude sites in Antarctica, as UCAMMs (Ultra Carbonaceous Antarctica Micro Meteorites). They are presently carefully preserved and analyzed, as unique remnants of the early solar system %G English %L insu-01851789 %U https://insu.hal.science/insu-01851789 %~ INSU %~ CNRS %~ LATMOS %~ UVSQ %~ UNIV-PARIS-SACLAY %~ UVSQ-SACLAY %~ SORBONNE-UNIVERSITE %~ SORBONNE-UNIV %~ SU-SCIENCES %~ UVSQ-UPSACLAY %~ GS-ENGINEERING %~ GS-GEOSCIENCES %~ GS-PHYSIQUE %~ INSTITUT-SCIENCES-LUMIERE %~ ALLIANCE-SU