Imaging Saturn's rings with CAMIRAS: thermal inertia of B and C rings

Details Imaging Saturn's rings with CAMIRAS: thermal inertia of B and C rings Imaging Saturn's rings with CAMIRAS: thermal inertia of B and C rings

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...441..379f&link_type=abstract

Astronomy and Astrophysics, Volume 441, Issue 1, October I 2005, pp.379-389

Astronomy and Astrophysics

Astrophysics

18

Planetary Rings, Infrared: Solar System, Conduction, Radiation Mechanism: Thermal

Scientific paper

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 Γ_B=5+18-2 {J m-2 K-1 s-1/2} and Γ_C=6+12-4 {J m-2 K-1 s-1/2}. 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.

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