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Rotating dust particles in the coma of comet 67P/Churyumov-Gerasimenko
INAF Osservatorio Astron, I-34143 Trieste, Italy..
INAF Ist Astrofis & Planetol Spaziali, Area Ric Tor Vergata, I-00133 Rome, Italy..
Univ Padua, CISAS, I-35100 Padua, Italy..
Inst Astrofis Andalucia CSIC, Granada 18008, Spain..
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2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 583, A14Article in journal (Refereed) PublishedText
Abstract [en]

Context. During September and October 2014, the OSIRIS cameras onboard the ESA Rosetta mission detected millions of single particles. Many of these dust particles appear as long tracks (due to both the dust proper motion and the spacecraft motion during the exposure time) with a clear brightness periodicity. Aims. We interpret the observed periodic features as a rotational and translational motion of aspherical dust grains. Methods. By counting the peaks of each track, we obtained statistics of a rotation frequency. We compared these results with the rotational frequency predicted by a model of aspherical dust grain dynamics in a model gas flow. By testing many possible sets of physical conditions and grain characteristics, we constrained the rotational properties of dust grains. Results. We analyzed on the motion of rotating aspherical dust grains with different cross sections in flow conditions corresponding to the coma of 67P/Churyumov-Gerasimenko qualitatively and quantitatively. Based on the OSIRIS observations, we constrain the possible physical parameters of the grains.

Place, publisher, year, edition, pages
2015. Vol. 583, A14
Keyword [en]
comets: general, comets: individual: 67P/Churyumov-Gerasimenko, methods: numerical, space vehicles
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-270602DOI: 10.1051/0004-6361/201526158ISI: 000365072200062OAI: oai:DiVA.org:uu-270602DiVA: diva2:890259
Swedish National Space Board
Available from: 2016-01-01 Created: 2016-01-01 Last updated: 2016-01-01Bibliographically approved

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Rickman, HansDavidsson, Björn
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