Bessel is a small lunar impact crater that is located in the southern half of the Mare Serenitatis.

The outer rim is not significantly worn, and there are no features of note on the interior, apart from some slumping of material from the inner walls to the floor.

A large ray crosses the mare from north to south, passing Bessel's western side.

However, the Tycho ray terminates in the central highlands, hundreds of kilometers south of the Bessel region.

[2] By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Bessel.