Petavius Crater is pretty large at approx. 177 km wide. As a point of comparison, the often observed Plato Crater is 109 km. The prominent rille is estimated at 80 km long and it seems to rise up to the top of the crater wall. My rough guess is that the rille is about 3-4 km wide, which is about 2-3 miles wide.
(As another point of comparison, Gassendi Crater is 110 km and Lacus Mortis is 150 km wide.)
Data was captured 10/26/18 at approx. 1:22 am local time. 16.5 day old moon. C11, ASI 174mm camera, 610nm filter, flats used. This is about 400 frames out of 6000.
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