Pretty sure it simply can't resolve it.. Yep, unless I goofed the math, Hubble can only resolve to ~500ft on the Moon's surface from ~200,000 miles away. Whereas LRO is only something like 50 mi above the Moon and uses (IIRC) the same camera as the Mars Orbiter that imaged the Phoenix lander from its altitude of ~200 mi (again IIRC). The LRO camera is at least a thousand times closer to its target than Hubble.
