Sumner is a lunar

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...

on the far side of the

Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width ...

, beyond the northeastern limb. It is southwest of the larger crater Szilard, and southeast of the twin walled plains

Fabry Fabry or Fábry is a surname. Notable people with the surname include: *Branislav Fábry (born 1985), Slovak ice hockey player *Charles Fabry, French physicist, co-inventor of the Fabry-Pérot etalon *Jean Fabry (1876-1968), French politician *Joha ...

and

Harkhebi Harkhebi (ca. 300 BC) was an astronomer who lived in Ptolemaic Egypt during the rule of the Ptolemaic dynasty. He was known as the priest of Selket (the stargazer). He specialized in the treatment of snake bites and scorpion stings. He also kept r ...

. This crater formation has been heavily damaged by a history of impacts, leaving an irregular, battered outer rim. A smaller impact crater has merged into the southern rim; the northern rim is little more than an irregular, arcing range of ridges. The interior is nearly as irregular, and the entire formation is little more than a rugged depression in the surface. Starting about 30 kilometers to the north of Sumner and progressing to the east-southeast is a long, linear chain of craters that forms an irregular cleft in the surface. This formation is named ''Catena Sumner'' after the nearby crater. It progresses to the northeast rim of Harriot A, a satellite crater of Harriot.

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 Sumner.

References

* * * * * * * * * * * * {{refend Impact craters on the Moon