I've zoomed in on this feature, seen at the upper edge of the PIA19586 image, and i see some
characteristics (shapes) which look unusual for a group of craters.
Where there should be the line associated with the crater's rim -at 4:00 in the group- we see
that opposing shapes are cutting through that rim-line. To add to this unusual characteristic,
we might also see that those shapes appear to be opposing crescents, as though we were looking
down on a pin-wheel, (maybe/maybe not)..
But more importantly,, here again we have something obscuring the rim
of a crater which is in close proximity to an area with brighter surfaces and focused brightness
seen at the time of this image..

Zoomed in on the edge of image PIA19586
d..z
...