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Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun

Rotundi, Alessandra; Sierks, Holger; Della Corte, Vincenzo; Fulle, Marco; Gutierrez, Pedro J.; Lara, Luisa; Barbieri, Cesare; Lamy, Philippe L.; Rodrigo, Rafael; Koschny, Detlef; Rickman, Hans; Keller, Horst Uwe; López-Moreno, José J.; Accolla, Mario; Agarwal, Jessica; A'Hearn, Michael F.; Altobelli, Nicolas; Angrilli, Francesco; Barucci, M. Antonietta; Bertaux, Jean-Loup; Bertini, Ivano; Bodewits, Dennis; Bussoletti, Ezio; Colangeli, Luigi; Cosi, Massimo; Cremonese, Gabriele; Crifo, Jean-Francois; Da Deppo, Vania; Davidsson, Björn; Debei, Stefano; De Cecco, Mariolino; Esposito, Francesca; Ferrari, Marco; Fornasier, Sonia; Giovane, Frank; Gustafson, Bo; Green, Simon F.; Groussin, Olivier; Grün, Eberhard; Güttler, Carsten; Herranz, Miguel L.; Hviid, Stubbe F.; Ip, Wing; Ivanovski, Stavro; Jerónimo, José M.; Jorda, Laurent; Knollenberg, Joerg; Kramm, Rainer; Kührt, Ekkehard; Küppers, Michael; Lazzarin, Monica; Leese, Mark R.; López-Jiménez, Antonio C.; Lucarelli, Francesca; Lowry, Stephen C.; Marzari, Francesco; Epifani, Elena Mazzotta; McDonnell, J. Anthony M.; Mennella, Vito; Michalik, Harald; Molina, Antonio; Morales, Rafael; Moreno, Fernando; Mottola, Stefano; Naletto, Giampiero; Oklay, Nilda; Ortiz, José L.; Palomba, Ernesto; Palumbo, Pasquale; Perrin, Jean-Marie; Rodríguez, Julio; Sabau, Lola; Snodgrass, Colin; Sordini, Roberto; Thomas, Nicolas; Tubiana, Cecilia; Vincent, Jean-Baptiste; Weissman, Paul; Wenzel, Klaus-Peter; Zakharov, Vladimir and Zarnecki, John C. (2015). Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun. Science, 347(6220), article no. 905.

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Critical measurements for understanding accretion and the dust/gas ratio in the solar nebula, where planets were forming 4.5 billion years ago, are being obtained by the GIADA (Grain Impact Analyser and Dust Accumulator) experiment on the European Space Agency’s Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 and 3.4 astronomical units inbound, GIADA and OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) detected 35 outflowing grains of mass 10−10 to 10−7 kilograms, and 48 grains of mass 10−5 to 10−2 kilograms, respectively. Combined with gas data from the MIRO (Microwave Instrument for the Rosetta Orbiter) and ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) instruments, we find a dust/gas mass ratio of 4 ± 2 averaged over the sunlit nucleus surface. A cloud of larger grains also encircles the nucleus in bound orbits from the previous perihelion.The largest orbiting clumps are meter-sized, confirming the dust/gas ratio of 3 inferred at perihelion from models of dust comae and trails.

Item Type: Journal Item
Copyright Holders: 2015 American Association for the Advancement of Science
ISSN: 1095-9203
Extra Information: 6 pp.
Keywords: Churyumov-Gerasimenko comet; stellar dust; nebulae; astronautical instruments; cosmic grains; particle size distribution; Rosetta (Spacecraft)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Item ID: 41974
Depositing User: Mark Leese
Date Deposited: 30 Jan 2015 10:34
Last Modified: 07 Dec 2018 10:28
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