Cassini special Photo diary 10


9 September: NASA announces a new moon, or possibly two, orbiting 141,000 kilometres from the centre of the planet, just outside its F ring. The object, which is between 4 and 5 kilometres in diameter, was spotted in images taken by Cassini on 21 June. A similar object was seen five hours later, just inside the ring. Researchers aren't sure if the two images are of the same moon following an elliptical orbit, or two separate moons. Or they might just be temporary clumps of matter, lasting only a few months.

A new ring has also been found, albeit an extremely faint one (see image). It is 300 kilometres wide, and lies 138,000 kilometres from the centre of the planet, in the same orbit as the moon Atlas (shown by the red dotted line). It falls between Saturn's A ring, which marks the outer layer of Saturn's main set of rings, and the F ring.

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