Coordinates | 49°30′S21°42′W / 49.5°S 21.7°W |
---|---|
Diameter | 145 km |
Depth | 4.5 km |
Colongitude | 22° at sunrise |
Eponym | C. S. Longomontanus |
Longomontanus is an ancient lunar impact crater located in the rugged southern highlands to the southwest of the bright ray crater Tycho. Longomontanus is of the variety of large lunar formations called a "walled plain", although it is actually more of a circular depression in the surface.
Because of its location, Longomontanus appears distinctly oval in shape due to foreshortening. To the southeast of Longomontanus is the even larger formation Clavius, and to the east is Maginus. North of the rim is the irregular crater Montanari, which in turn is joined at its northern rim by Wilhelm.
The wall of Longomontanus is heavily worn and incised by past impacts, and the rim is essentially level with the surrounding terrain. The northern rim especially is impacted with multiple overlapping craterlets. To the east of the rim is a semi-circular ridge that has the appearance of an overlapped crater rim. The crater floor of Longomontanus is relatively flat, with a low cluster of central peaks somewhat offset to the west.
Longomontanus is one of the largest craters of Nectarian age. [1]
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Longomontanus.
Longomontanus | Latitude | Longitude | Diameter |
---|---|---|---|
A | 52.8° S | 24.0° W | 29 km |
B | 52.9° S | 20.7° W | 48 km |
C | 53.4° S | 19.0° W | 31 km |
D | 54.3° S | 22.9° W | 29 km |
E | 51.4° S | 18.0° W | 8 km |
F | 48.2° S | 23.5° W | 19 km |
G | 48.7° S | 18.5° W | 15 km |
H | 52.0° S | 23.2° W | 7 km |
K | 47.9° S | 20.9° W | 15 km |
L | 49.1° S | 23.6° W | 16 km |
M | 48.6° S | 23.2° W | 10 km |
N | 50.8° S | 25.7° W | 12 km |
P | 48.1° S | 25.3° W | 7 km |
Q | 52.0° S | 20.5° W | 11 km |
R | 52.4° S | 26.1° W | 9 km |
S | 47.4° S | 23.3° W | 12 km |
T | 46.8° S | 22.7° W | 5 km |
U | 52.0° S | 22.0° W | 7 km |
V | 50.7° S | 18.9° W | 5 km |
W | 47.1° S | 21.3° W | 10 km |
X | 53.0° S | 17.7° W | 5 km |
Y | 52.3° S | 28.2° W | 4 km |
Z | 50.0° S | 18.7° W | 95 km |
Struve is the lava-flooded remains of a lunar impact crater. It is located near the western extreme of the Oceanus Procellarum, close to the western lunar limb. As a consequence, even though it is roughly circular in outline, it appears oval due to foreshortening.
Brayley is a lunar impact crater located in the southwest part of the Mare Imbrium. It was named after British geographer Edward W. Brayley in 1935. It has a circular rim and a low rise in the center. There are no notable craters overlapping the rim or interior. The sinuous rille Rima Brayley passes to the north of Brayley.
Cleomedes is a prominent lunar impact crater located in the northeast part of the visible Moon, to the north of Mare Crisium. It was named after Greek astronomer Cleomedes. It is surrounded by rough ground with multiple crater impacts. The irregular crater Tralles intrudes into the northwest rim. To the east is Delmotte. North of Cleomedes is a triple-crater formation with Burckhardt occupying the center.
Autolycus is a lunar impact crater that is located in the southeast part of Mare Imbrium. The crater is named after the ancient Greek astronomer Autolycus of Pitane. West of the formation is Archimedes, a formation more than double the size of Autolycus. Just to the north is Aristillus, and the outer ramparts of these two craters overlap in the intermediate stretch of the lunar mare.
Flamsteed is a small lunar impact crater located on the Oceanus Procellarum, which is named after British astronomer John Flamsteed. It lies almost due east of the dark-hued Grimaldi, and north-northwest of the flooded Letronne bay on the south edge of the mare.
Boyle is a lunar impact crater that is located in the southern hemisphere on the rugged far side of the Moon. It is adjacent to the larger crater Hess to the southeast, and lies about midway between the craters Alder to the north-northeast and Abbe to the south-southwest.
Dawson is a lunar impact crater that lies on the southern hemisphere on the far side of the Moon. It lies across a crater triplet: the southeast rim is intruding into the crater Alekhin; the northwest rim also intrudes into the larger satellite crater Dawson V, and the northeast rim is attached to the comparably sized Dawson D. To the south of this formation is the large crater Zeeman. West of Dawson is the crater Crommelin, and to the north lies Fizeau.
Bernoulli is a lunar impact crater that is located in the northeast part of the Moon. It lies to the south of the crater Messala, and east of Geminus.
Brown is a lunar impact crater that is located in the southeast part of the Moon, to the southwest of the prominent ray crater Tycho. Northwest of Brown is the crater Wilhelm, and to the west is Montanari. This crater was named after Ernest William Brown, and is distinct from crater D. Brown, a satellite crater of the Apollo crater.
Compton is a prominent lunar impact crater that is located in the northern hemisphere on the far side of the Moon. It lies to the east of the Mare Humboldtianum, and southwest of the walled plain Schwarzschild. To the southeast of Compton is the heavily eroded crater Swann.
Biela is a lunar impact crater that is located in the rugged highlands of the southeastern Moon. It is named after Austrian astronomer Wilhelm von Biela. The crater lies to the east of Rosenberger, to the southeast of the Watt–Steinheil double crater.
Boussingault is a large lunar impact crater that lies near the rugged southeast limb of the Moon. Because of its location, Boussingault appears highly oblong in shape due to foreshortening. To the southwest is the crater Boguslawsky, and almost attached to the northeast rim is Helmholtz. East-southeast of Boussingault lies the crater Neumayer.
Carpenter is a lunar impact crater in the northern part of the Moon, relatively close to the limb. At this position the crater is foreshortened and appears oval in shape. It is, however, very nearly circular in outline. The outer rampart to the south is adjoined to the old crater Anaximander, and the satellite formation Anaximander B lies along the western rim. To the northeast is Anaximenes.
Goldschmidt is a large lunar impact crater of the variety commonly termed a walled plain. It lies in the northern part of the Moon's near side, and appears oval in shape due to foreshortening. The rim is actually relatively circular, although the western rim is overlain by the prominent crater Anaxagoras. Nearly attached to the southeast rim is Barrow, and the two formations are separated by a rugged rise about 30 kilometers across. Further to the south is Epigenes.
Cysatus is a lunar impact crater that is located in the southern part of the Moon's near side. It is joined to the northeastern rim of the larger crater Gruemberger, and intrudes slightly into the interior of that formation. Due south is the larger Moretus, and to the east is Curtius. These craters appear foreshortened when observed from Earth because of their far south location.
Campbell is a large lunar impact crater that is located in the northern hemisphere on the far side of the Moon. It lies to the southwest of the walled plain D'Alembert, an even larger formation. If Campbell were located on the near side of the Moon as seen from the Earth, it would form one of the largest visible craters, being slightly larger than Schickard. It is bordered by several craters of note, with Wiener to the southwest, Von Neumann just to the south, Ley overlying the southeast rim, and Pawsey to the west.
Chapman is a lunar impact crater that lies just beyond the northwest rim of the Moon, on the far side as seen from the Earth. It lies to the northeast of the crater Rynin, and southward of the large walled plain Poczobutt.
Montanari is a lunar impact crater. It is located to the west-southwest of the prominent ray crater Tycho, and is attached to the southern rim of the walled plain Wilhelm. Along the northwestern side is the crater remnant Lagalla, and just to the south is the large walled plain Longomontanus.
Nobili is a lunar impact crater that lies near the eastern limb of the Moon, giving it a foreshortened appearance when viewed from the Earth. The crater overlies the western rim of the slightly larger crater Schubert X, and the eastern rim of this satellite crater is overlain in turn by Jenkins, resulting in a triple crater formation. To the south lies Gilbert.
Das is a lunar impact crater on the far side of the Moon. It is located to the north-west of the walled plain Chebyshev. To the south-west of Das is the irregular crater Mariotte, and Von der Pahlen lies to the east-northeast. The crater was named after Indian astronomer Anil Kumar Das.