Proctor is the remnant of 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 to the southeast of the prominent crater Tycho

Tycho (crater)

Tycho is a prominent lunar impact crater located in the southern lunar highlands, named after the Danish astronomer Tycho Brahe . To the south is the crater Street; to the east is Pictet, and to the north-northeast is Sasserides. The surface around Tycho is replete with craters of various sizes,...

. It lies just to the north of the huge walled plain Maginus

Maginus (crater)

Maginus is an ancient lunar impact crater located in the southern highlands to the southeast of the prominent crater Tycho. It is a large formation almost three quarters the diameter of Clavius, which lies to the southwest...

. To the north is the crater Saussure

Saussure (crater)

Saussure is a lunar crater. It is located in the crater-riddled terrain in the southern hemisphere of the Moon's near side. Just to the north and nearly attached to the rim is the larger crater Orontius. About a half crater diameter due west is the slightly larger crater Pictet...

 and to the northwest, just to the east of Tycho, lies Pictet

Pictet (crater)

Pictet is a lunar impact crater located just to the east of the larger and more prominent impact crater Tycho. The high-albedo rays and ejecta from Tycho lie across Pictet and spread far to the east and in other directions. Pictet is older than Tycho and is somewhat worn by past impacts. The...

. Proctor is 52 kilometers in diameter and its walls are 1,300 meters high. It is from the Pre-Imbrian period

Lunar geologic timescale

The lunar geological timescale divides the history of Earth's Moon into five generally recognized periods: the Copernican, Eratosthenian, Imbrian , Nectarian, and Pre-Nectarian...

, which lasted from 4.55 to 3.85 billion years ago.

The outer rim of this crater has become heavily worn and eroded, and now forms a low, irregular rise around the interior floor. Much of the northwestern half of the rim is marked by a number of small craters, including Proctor D. The interior floor is somewhat level and is marked only by a few tiny impacts.

The crater is named after the 20th-century American astronomy writer Mary Proctor

Mary Proctor

Mary Proctor was an American popularizer of astronomy.She was born in Dublin, Ireland, the daughter of Mary and Richard Proctor. They emigrated to the United States in 1882. Her father was a British popularizer of astronomy, and she gained her knowledge of the subject from him...

.

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 Proctor.

Proctor	Latitude	Longitude	Diameter
A	47.0° S	6.7° W	8 km
B	46.4° S	6.7° W	8 km
C	47.7° S	6.6° W	5 km
D	46.1° S	6.0° W	12 km
E	45.4° S	5.1° W	8 km
F	47.7° S	5.2° W	7 km
G	47.7° S	4.8° W	7 km
H	45.7° S	2.5° W	5 km