Thermal inertia and roughness of the nucleus of comet 67P/Churyumov-Gerasimenko from MIRO and VIRTIS observations

Marshall, D.; Groussin, O.; Vincent, J.-B.; Brouet, Yann; Kappel, D.; Arnold, G.; Capria, M. T.; Filacchione, G.; Hartogh, P.; Hofstadter, M.; Ip, W.-H.; Jorda, L.; Kuehrt, E.; Lellouch, E.; Mottola, S.; Rezac, L.; Rodrigo, Rafael; Rodionov, S.; Schloerb, P. and Thomas, Nicolas (2018). Thermal inertia and roughness of the nucleus of comet 67P/Churyumov-Gerasimenko from MIRO and VIRTIS observations. Astronomy and astrophysics, 616, A122. EDP Sciences 10.1051/0004-6361/201833104

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Aims. Using data from the Rosetta mission to comet 67P/Churyumov-Gerasimenko, we evaluate the physical properties of the surface and subsurface of the nucleus and derive estimates for the thermal inertia (TI) and roughness in several regions on the largest lobe of the nucleus. Methods. We have developed a thermal model to compute the temperature on the surface and in the uppermost subsurface layers of the nucleus. The model takes heat conduction, self-heating, and shadowing effects into account. To reproduce the brightness temperatures measured by the MIRO instrument, the thermal model is coupled to a radiative transfer model to derive the TI. To reproduce the spatially resolved infrared measurements of the VIRTIS instrument, the thermal model is coupled to a radiance model to derive the TI and surface roughness. These methods are applied to Rosetta data from September 2014. Results. The resulting TI values from both instruments are broadly consistent with each other. From the millimetre channel on MIRO, we determine the TI in the subsurface to be <80 JK

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Brouet, Yann and Thomas, Nicolas

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

04 Jul 2018 14:47

Last Modified:

22 Mar 2019 11:36

Publisher DOI:

10.1051/0004-6361/201833104

BORIS DOI:

10.7892/boris.118280

URI:

https://boris.unibe.ch/id/eprint/118280

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