Cichus 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 ...

that lies in the southwestern part 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 ...

, at the eastern edge of Palus Epidemiarum. Just to the northeast and nearly contacting the rim is the

lava Lava is molten or partially molten rock ( magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or ...

-flooded crater remnant

Weiss Weiss or Weiß may refer to: People * Weiss (surname), including spelling Weiß * Weiss Ferdl (1883-1949), German actor Places * Mount Weiss, Jasper National Park, Alberta, Canada * Weiss Lake, Alabama * Weiß (Sieg), a river in North Rhine-West ...

. The crater is named after Italian astronomer Cecco d'Ascoli. The rim of this crater is only slightly worn, although the crater Cichus C lies across the southwestern rim. Sections of the inner wall are

terrace Terrace may refer to: Landforms and construction * Fluvial terrace, a natural, flat surface that borders and lies above the floodplain of a stream or river * Terrace, a street suffix * Terrace, the portion of a lot between the public sidewalk an ...

d, and the western side is somewhat wider than in the east. Several small ridges lie across the interior floor. A

ray Ray may refer to: Fish * Ray (fish), any cartilaginous fish of the superorder Batoidea * Ray (fish fin anatomy), a bony or horny spine on a fin Science and mathematics * Ray (geometry), half of a line proceeding from an initial point * Ray (gra ...

from the bright crater

Tycho Tycho is a masculine given name, a latinization of Greek Τύχων, from the name of Tyche ( grc-gre, Τύχη, link=no), the Greek goddess of fortune or luck. The Russian form of the name is '' Tikhon'' (Тихон). People Given name * Tych ...

to the southeast passes tangentially just to the northeast of the rim.

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 Cichus.

References

* * * * * * * * * * * {{Craters on the Moon: C-F Impact craters on the Moon