Zeno (crater)
Zeno is a lunar impact crater located near the northwest limb of the Moon. It lies to the east-southeast of Mercurius crater. Further to the east of Zeno, along the limb, is the well-formed Boss crater. The rim of Zeno is slightly distorted and has received some erosion due to subsequent impacts. There is a depression in the surface attached to the eastern rim, forming a bulging extension. Small craters lie on the southern rim and across the interior of the northern wall. The crater 'Zeno B' is attached to the exterior of the southwest rim, and the distorted 'Zeno A' is attached in turn to the western rim of 'Zeno B'.
Satellite craters
By convention these features are identified on Lunar maps by placing the letter on the side of the crater mid-point that is closest to Zeno crater.
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