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  Optical properties of cometary particles collected by COSIMA: Assessing the differences between microscopic and macroscopic scales

Langevin, Y., Merouane, S., Hilchenbach, M., Vincendon, M., Hornung, K., Engrand, C., et al. (2020). Optical properties of cometary particles collected by COSIMA: Assessing the differences between microscopic and macroscopic scales. Planetary and Space Science, 182: 104815. doi:10.1016/j.pss.2019.104815.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-DB29-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-D13F-8
Genre: Journal Article

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 Creators:
Langevin, Y., Author
Merouane, Sihane1, Author              
Hilchenbach, Martin1, Author              
Vincendon, M., Author
Hornung, K., Author
Engrand, C., Author
Schulz, R., Author
Kissel, Jochen1, Author              
Ryno, J., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_PROJECTS: ROSETTA: COSIMA
 Abstract: The COSIMA mass spectrometer on-board Rosetta was equipped with an optical microscope, Cosiscope, which identified several 10,000 cometary particles collected on targets exposed during the orbital phase around the nucleus of comet 67P Churyumov-Gerasimenko. The median value of reflectance factors evaluated from Cosiscope images for large collected particles (~10.5% (Langevin et al., 2017), lies above the range of reflectance observed by the OSIRIS camera at a similar wavelength (5–7%, (Fornasier et al., 2015), but at much larger scales (a few 10 ​cm instead of a few 10 ​μm). In order to better understand this discrepancy, the assumptions underlying the derivation of reflectance factors have been reassessed using laboratory measurements of COSIMA targets and analogs of cometary particles. The approach of Langevin et al. is validated, but we consider that the uncertainty on reflectance factors was conservative. The reflectance factors are likely to lie in the lower half of the previously estimated range, which reduces (but does not eliminate) the discrepancy with OSIRIS albedos. The remaining discrepancy can be attributed primarily to the difference in scale (factor 10,000 in pixel size between COSIMA and OSIRIS):

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.pss.2019.104815
 Degree: -

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Title: Planetary and Space Science
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 182 Sequence Number: 104815 Start / End Page: - Identifier: ISSN: 0032-0633
CoNE: https://pure.mpg.de/cone/journals/resource/954925434422