I’m still peeved that Cassini has not yet, to my knowledge, taken even one close up picture of a ring particle. I appreciate that the camera is shielded when passing through the plane of the rings to avoid impact damage, but still.
Wikipedia thoroughly contradicts itself when talking about the ring particles. In one place it has “ranging in size from micrometres to metres” and in another place “composed of particles ranging in size from 1 centimetre to 10 meters”. That’s a heck of an inconsistency, like a factor of 10 or more. When I look up the reference for the first of these two statements it gets even worse “ranging in size from boulders as large as small apartment buildings to fine, dust-sized specks”, and that’s from the Cassini team! When I look up the second reference it’s from 1985, so that’s hardly current. This 1985 data is from Voyager and gives an upper limit on A ring particle diameter, according to a paper from 2015, of 7 metres.
But there is at least some recent information. From 2015, “minimum particle size is 4.5 mm, for outermost A ring.” “minimum particle size is 15 mm for particles near Encke Gap”.
The ring thickness is also inconsistent between different sources, but at least here we have the explanation that different rings have different thicknesses. Thickness estimates range from “as little as 10 metres to as much as 1 kilometre “.
More information wanted, Cassini, pull your finger out.
On another Cassini topic, an island a couple of km long has appeared in a lake on Titan and disappeared again since Cassini arrived. See apod from a couple of days ago for details.