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  Observational constraints to the dynamics of dust particles in the coma of comet 67P/Churyumov-Gerasimenko

Frattin, E., Bertini, I., Ivanovski, S. L., Marzari, F., Fulle, M., Zakharov, V. V., et al. (2021). Observational constraints to the dynamics of dust particles in the coma of comet 67P/Churyumov-Gerasimenko. Monthly Notices of the Royal Astronomical Society, 504(4), 4687-4705. doi:10.1093/mnras/stab1152.

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Frattin, E., Author
Bertini, I, Author
Ivanovski, S. L., Author
Marzari, F., Author
Fulle, M., Author
Zakharov, V. V., Author
Moreno, F., Author
Naletto, G., Author
Lazzarin, M., Author
Cambianica, P., Author
Cremonese, G., Author
Ferrari, S., Author
Ferri, F., Author
Guettler, C.1, Author              
La Forgia, F., Author
Lucchetti, A., Author
Pajola, M., Author
Penasa, L., Author
Rotundi, A., Author
Sierks, H.1, Author              
Tubiana, C.1, Author               more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: methods: data analysis, techniques: image processing, techniques: photometric, comets: individual
 Abstract: In this work, we aim to characterize the dust motion in the inner coma of comet 67P/Churyumov–Gerasimenko to provide constraints for theoretical 3D coma models. The OSIRIS camera on-board the Rosetta mission was able for the first time to acquire images of single dust particles from inside the cometary coma, very close to the nucleus. We analyse a large number of particles, performing a significant statistic of their behaviour during the post-perihelion period, when the spacecraft covered distances from the nucleus ranging between 80 and 400 km. We describe the particle trajectories, investigating their orientation and finding highly radial motion with respect to the nucleus. Then, from the particle brightness profiles, we derive a particle rotational frequency of ν < 3.6 Hz, revealing that they are slow rotators and do not undergo fragmentation. We use scattering models to compare the observed spectral radiance of the particles with the simulated ones in order to estimate their size, finding values that range from millimetres up to centimetres. The statistics performed in this paper provide useful parameters to constrain the cometary coma dynamical models.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab1152
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 504 (4) Sequence Number: - Start / End Page: 4687 - 4705 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150