T. Mayer, or Tobias Mayer, 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 at the western end of the Montes Carpatus

Montes Carpatus

Montes Carpatus is a mountain range that forms the southern edge of the Mare Imbrium on the Moon. The selenographic coordinates of this range are 14.5° N, 24.4° W, and the formation has an overall diameter of . They were named after the Carpathian Mountains in Central Europe.This rugged range...

 mountain range along the southern edge of Mare Imbrium

Mare Imbrium

Mare Imbrium, Latin for "Sea of Showers" or "Sea of Rains", is a vast lunar mare filling a basin on Earth's Moon and one of the larger craters in the Solar System. Mare Imbrium was created when lava flooded the giant crater formed when a very large object hit the Moon long ago...

. To the west is the Oceanus Procellarum

Oceanus Procellarum

Oceanus Procellarum is a vast lunar mare on the western edge of the near side of the Earth's Moon. Its name derives from the old superstition that its appearance during the second quarter heralded bad weather...

, and to the south is Mare Insularum

Mare Insularum

Mare Insularum is a lunar mare located in the Insularum basin just south of Mare Imbrium. The basin material is of the Lower Imbrian epoch, with the mare material of the Upper Imbrian epoch. The mare is bordered by the craters Copernicus on the east, and Kepler on the west...

. The crater is located a couple of hundred kilometers to the northwest of the prominent crater Copernicus

Copernicus (lunar crater)

Copernicus is a prominent lunar impact crater named after the astronomer Nicolaus Copernicus, located in eastern Oceanus Procellarum. It is estimated to be about 800 million years old, and typifies craters that formed during the Copernican period in that it has a prominent ray system.-...

.

This crater is embedded within a region of rugged ridges and these are attached to the exterior of the rim, most notably along the east and northeast. The rim is generally circular with the bowl-shaped T. Mayer A attached to the exterior along the east-southeast. Within the interior is a level floor marked only by a few craterlets.

Due south of T. Mayer is a cluster of lunar dome

Lunar dome

A lunar dome is a type of shield volcano that is found on the surface of the Earth's Moon. They are typically formed by highly viscous, possibly silica-rich lava, erupting from localized vents followed by relatively slow cooling. Lunar domes are wide, rounded, circular features with a gentle slope...

s, some of which have tiny craterlets at the summits. These domes are the result of volcanic activity.

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 T. Mayer.

T. Mayer	Latitude	Longitude	Diameter
A	15.3° N	28.3° W	16 km
B	15.4° N	30.9° W	13 km
C	12.2° N	26.0° W	15 km
D	12.2° N	26.8° W	8 km
E	16.1° N	26.2° W	9 km
F	12.9° N	28.9° W	6 km
G	17.3° N	27.1° W	7 km
H	11.7° N	25.5° W	3 km
K	18.1° N	27.6° W	5 km
L	13.2° N	24.7° W	4 km
M	14.9° N	25.6° W	5 km
N	13.5° N	25.6° W	5 km
P	14.0° N	29.5° W	35 km
R	11.6° N	26.4° W	5 km
S	11.7° N	28.3° W	3 km
W	17.5° N	34.9° W	34 km
Z	14.2° N	26.1° W	4 km