Bayer 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...

 impact 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...

 located in the southwest section of the moon, to the east of the crater Schiller

Schiller (crater)

Schiller is an oddly shaped lunar impact crater located in the southwestern sector of the Moon. To the east is the crater Bayer and to the southeast is Rost....

. The rim of Bayer is slightly worn by erosion, but remains well-defined. There is an inner terrace, but the outer wall is intruded upon by nearby impacts. The most significant of these is Schiller H, which forms a ridge attached to the northwest rim of Bayer. The floor of Bayer is relatively flat and lacks a central peak. There is a small, but notable crater on the floor near the western wall. This crater has a breach in its northern rim.

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 Bayer.

Bayer	Latitude	Longitude	Diameter
A	51.3° S	30.3° W	18 km
B	48.8° S	28.2° W	18 km
C	49.7° S	31.2° W	22 km
D	47.9° S	29.8° W	20 km
E	51.7° S	32.3° W	29 km
F	53.0° S	31.6° W	20 km
G	51.7° S	35.3° W	7 km
H	53.5° S	32.5° W	27 km
J	52.5° S	33.6° W	18 km
K	50.2° S	34.0° W	16 km
L	47.5° S	33.6° W	14 km
M	50.6° S	31.0° W	10 km
N	48.3° S	29.2° W	9 km
P	51.6° S	29.5° W	4 km
R	52.5° S	35.5° W	9 km
S	52.3° S	36.4° W	13 km
T	49.2° S	30.1° W	8 km
U	48.4° S	31.3° W	10 km
V	47.5° S	31.6° W	9 km
W	48.0° S	33.5° W	9 km
X	53.4° S	33.6° W	8 km
Y	49.2° S	35.7° W	31 km
Z	49.0° S	33.4° W	7 km