Cassini Mission results: Particles rich in silicates and water ice detected in saturn’s ring rain

Die Darstellung zeigt, wie geladene Wassereispartikel vom Ringsystem des Planeten Saturn in dessen Atmosphäre strömen wodurch sich deren Helligkeit verringert. Abbildung: NASA

A year ago, the Cassini spacecraft burned up in the atmosphere of the planet Saturn – a spectacular end to one of the most successful missions in space history. This event was preceded by 22 passes through the gap between Saturn and its rings. For the first time these orbits offered the opportunity to analyse the ring rain. This phenomenon arises because Saturn's rings are continuously bombarded by meteorites.

Fine particles of the ring material are released by the impacts. These particles move along the magnetic field lines, which emanate from the inside of the gas planet and enter its atmosphere. Dynamic analyses carried out at the University of Colorado in Boulder, USA, have already predicted this phenomenon.

The last orbits made it possible for the first time to detect the ring rain by measurements and to analyze the samples, which have their origin in the main ring, and to determine their composition. Particles rich in silicates and water ice were detected.

Complex organic compounds, embedded in water ice particles, were discovered. Most of the dust particles measured had the size range of a few ten nanometres. The scientists publish the new findings in the current issue of the journal Science.

The instrument with which these measurements were performed is the Cosmic Dust Analyzer (CDA). This instrument was developed and built by the Max Planck Institute for Nuclear Physics (Heidelberg) and the German Aerospace Center (DLR) (DLR). Scientific planning and mission operations have been carried out by the Institute of Space Systems (IRS) at the University of Stuttgart since 2011.

The Cassini-Huygens mission is a cooperative project between NASA, ESA and the Italian Space Agency. The Jet Propulsion Laboratory in Pasadena/USA leads the mission for NASA's Science Mission Directorate in Washington. The project is funded by Deutsches Zentrum für Luft- und Raumfahrt (DLR).

Dr. Ralf Srama, Universität Stuttgart, Institute of Space Systems, Tel.: +49 (0)711-685-62511, Mail: srama (at) irs.uni-stuttgart.de

Hsiang-Wen Hsu, Ralf Srama et.al. “In situ collection of dust grains falling from Saturn’s rings into its atmosphere“, Science 362 (2018). DOI: 10.1126/science.aat3185

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