Vitello is a lunar impact crater that lies along the southern edge of the small Mare Humorum, in the southwest part of the Moon's near side.
The interior floor is irregular, rugged and hilly, with a ring of deep fractures[2] surrounding the central peak.
In To A Rocky Moon, lunar geologist Don Wilhelms summarized: It "is a Saari-Shorthill infrared hotspot,[3] is fractured, and is blanketed and surrounded by a dark deposit.
However, Lunar Orbiter 5 acquired high-resolution images of the interior and geologists noted that the fractures were filled with boulders which caused the infrared anomaly, and so volcanic heat was not escaping from Vitello.
"[4] By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Vitello.