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I was mistaken about Gambart J - it is the diameter quoted. I had another look for it last night. Seeing was better and I was able to make it out. It is though very shallow, much shallower than the two very small craters beside it to the point that Gambart J the previous night had next to no shadow that was perceptible compared with those two tiny craters. Last night what I saw was the brighter edge of its rim which was easy enough to identify under the better seeing conditions, but no shadows to be able to see its concentric structure.
Fonetenell A's concentric structure may need until tonight to spot due to its position close the the lunar limb and the Sun needing to be higher up.
Next is Marth, hopefully tonight.
Alex.
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