 The fresh crater Gassendi A is adjacent to Gassendi to the north.Due to its ray system, Gassendi A is mapped as part of the Copernican System.On some older maps the crater Gassendi A was called "Clarkson", after the British amateur astronomer and selenographer Roland L. T. Clarkson, but this name is not officially recognized by the IAU and the name has been removed.Gassendi was considered for a possible landing site during the Apollo program, but was never selected.