Dufay is a lunar

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 that is located on the far side of the Moon

Far side of the Moon

The far side of the Moon is the lunar hemisphere that is permanently turned away, and is not visible from the surface of the Earth. The far hemisphere was first photographed by the Soviet Luna 3 probe in 1959, and was first directly observed by human eyes when the Apollo 8 mission orbited the Moon...

. It lies about one crater diameter to the east of the large walled plain Mandel'shtam

Mandel'shtam (crater)

Mandel'shtam is the remains of a large crater on the Moon's far side. Nearly attached to the northeast outer rim is the crater Papaleksi. To the south lies the crater Vening Meinesz....

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To the northwest is the crater Papaleksi

Papaleksi (crater)

Papaleksi is an impact crater on the far side of the Moon. It lies along the northeastern outskirts of the large crater Mandel'shtam. About 20 km to the north-northeast of Papaleksi is the similar crater Spencer Jones....

 and to the east is Valier

Valier (crater)

Valier is a lunar impact crater that lies on the far side of the Moon. It is nearly attached to the western rim of the crater Tiselius. To the north-northwest lies the larger Sharonov, to the south-southwest is Coriolis, and west of Valier is Dufay....

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The rim of this crater is heavily worn by impacts, and several small craterlets lie along the southern edge. The inner wall is somewhat wider on the western side when compared to the east and southeast. The interior floor is relatively level and featureless.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Dufay.

Dufay	Latitude	Longitude	Diameter
A	9.5° N	170.5° E	15 km
B	8.5° N	171.0° E	20 km
D	6.3° N	170.5° E	32 km
X	7.2° N	168.5° E	42 km
Y	8.3° N	168.4° E	16 km