Another moon for Saturn..

The Cassini imaging-science team have reported the discovery of S/2007 S 4, a satellite orbiting in the region between Saturn XXXII (Methone) and Saturn XXXIII (Pallene). Preliminary estimates suggest that S/2007 S 4 has a radius of about 1 km. Is a 1km rock really a satellite or just a rock? I’m not sure I know what the IAU definition is of when a rock becomes an orbiting satellite or not… hmmm.

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