Bayer (crater)

Bayer
	Lunar Orbiter 4 image
Coordinates	51°36′S 35°00′W / 51.6°S 35.0°W
Diameter	48.51 km (30.14 mi)
Depth	2.0 km (1.2 mi)
Colongitude	35° at sunrise
Eponym	Johann Bayer

Bayer is a lunar impact crater located in the southwest section of the moon, to the east of the crater Schiller.^[2] To the south is Rost.^[3]

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.^[4]^: 125 There is a small, but notable crater on the floor near the western wall, Bayer G.^[3] This crater has a breach in its northern rim.^[4]^: 125

This crater is named after German lawyer and astronomer Johann Bayer (1572-1625),^[1] the first person to produce a sky atlas that covered the entire celestial sphere.^[5] The formation's designation was formally adopted by the International Astronomical Union in 1935.^[1]

Satellite craters

By convention these features are identified on Lunar maps by placing the letter on the side of the crater midpoint that is closest to Bayer.^[6]

Bayer^[4]^: 293	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

References

1 2 3 "Bayer". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
↑ Moore, Patrick (2001). On the Moon. Sterling Publishing Co. pp. 202–203. ISBN 978-0-304-35469-6.
1 2 "LAC 125" (PDF). Gazeteer of Planetary Nomenclature. Retrieved 2026-06-10.
1 2 3 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.
↑ Ridpath, Ian. "Johann Bayer's southern star chart". Star Tales (2nd ed.). Retrieved 2026-06-01.
↑ Grego, P. (2015). "Satellite Crater". In Hargitai, H.; Kereszturi, Á. (eds.). Encyclopedia of Planetary Landforms. New York, NY: Springer. doi:10.1007/978-1-4614-3134-3_328.

Sources

Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.

[GPN-1] 1 2 3 "Bayer". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.

[Moore_2001-2] Moore, Patrick (2001). On the Moon. Sterling Publishing Co. pp. 202–203. ISBN 978-0-304-35469-6.

[LAC-125-3] 1 2 "LAC 125" (PDF). Gazeteer of Planetary Nomenclature. Retrieved 2026-06-10.

[Bussey_Spudis_2004-4] 1 2 3 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.

[Ridpath-5] Ridpath, Ian. "Johann Bayer's southern star chart". Star Tales (2nd ed.). Retrieved 2026-06-01.

[Grego_2015-6] Grego, P. (2015). "Satellite Crater". In Hargitai, H.; Kereszturi, Á. (eds.). Encyclopedia of Planetary Landforms. New York, NY: Springer. doi:10.1007/978-1-4614-3134-3_328.

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Bayer (crater)

Satellite craters

References

Sources