Volume 441, Number 1, October I 2005
|Page(s)||379 - 389|
|Section||Planets and planetary systems|
|Published online||13 September 2005|
Imaging Saturn's rings with CAMIRAS: thermal inertia of B and C rings
Laboratoire AIM, Unité Mixte de Recherche No. 7158 CEA-CNRS-Université Paris 7, France e-mail: firstname.lastname@example.org,email@example.com,firstname.lastname@example.org,email@example.com
2 Université Paris 6 – Pierre et Marie Curie, France
Accepted: 11 May 2005
Thermal inertias Γ of Saturn's B and C ring particles have been derived from infrared observations using the CAMIRAS camera mounted on the Canada-France-Hawaii Telescope. They are respectively and . Such low values might be characteristic of a frosty and porous regolith fractured by cracks or of very porous particle aggregates. Particles have to be slowly spinning to explain the observed ring temperatures. A large azimuthal asymmetry with an amplitude about 1 K is detected on the West ansa of the B ring. It cannot be explained by a model that considers the ring as a slab of low thermal inertia rapidly warming up to the sunlight after its eclipse into the planetary shadow.
Key words: planetary rings / infrared: solar system / conduction / radiation mechanism: thermal
© ESO, 2005
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