|A boulder perched on the north rim of a Copernican Age crater situated directly atop the Dorsa Smirnov wrinkle ridge in Mare Serenitatis. LROC Narrow Angle Camera (NAC) observation M168041107L, LRO Orbit 9898, August 15, 2011; resolution 0.25 meters per pixel, width of the field of view is only 145 meters [NASA/GSFC/Arizona State University].|
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Posidonius Y is a 2 km diameter Copernican Age crater located at 30.04°N, 29.4°E, in the upper northeast section of Mare Serenitatis. The crater is remarkably bouldery, which is a indication of a relatively young age. The boulder seen on the rim in today's Feature Image is about 25 meters long from stem to stern (about half the length of an Olympic sized swimming pool).
Since Posidonius Y is superposed on the wrinkle ridge system known as Dorsa Smirnov, the crater is also relatively younger than these tectonic features. The WAC context image below shows the beautiful combination of mare basalt volcanism, tectonics, and impact cratering that shape the lunar surface.
Explore the entire NAC frame!
Layers in Lucian Crater
Recent Impact in Oceanus Procellarum