Al-Mustazi is an 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 on the anti-Saturn hemisphere of Saturn

Saturn

Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Saturn is named after the Roman god Saturn, equated to the Greek Cronus , the Babylonian Ninurta and the Hindu Shani. Saturn's astronomical symbol represents the Roman god's sickle.Saturn,...

's moon Enceladus

Enceladus (moon)

Enceladus is the sixth-largest of the moons of Saturn. It was discovered in 1789 by William Herschel. Until the two Voyager spacecraft passed near it in the early 1980s very little was known about this small moon besides the identification of water ice on its surface...

. Al-Mustazi was first observed in Cassini images during that mission's March 2005 flyby of Enceladus. It is located at 20.8° South Latitude

Latitude

In geography, the latitude of a location on the Earth is the angular distance of that location south or north of the Equator. The latitude is an angle, and is usually measured in degrees . The equator has a latitude of 0°, the North pole has a latitude of 90° north , and the South pole has a...

, 198.4° West Longitude

Longitude

Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. It is an angular measurement, usually expressed in degrees, minutes and seconds, and denoted by the Greek letter lambda ....

, and is ten kilometers across. Cassini observed numerous southwest-northeast trending fractures cutting across the southwest rim of Al-Mustazi, forming canyons several hundred meters deep. These fractures were deflected by the weakened regolith

Regolith

Regolith is a layer of loose, heterogeneous material covering solid rock. It includes dust, soil, broken rock, and other related materials and is present on Earth, the Moon, some asteroids, and other terrestrial planets and moons.-Etymology:...

 produced by the Al-Mustazi impact. This deflection produced the pattern of radiating fractures seen along the northeastern rim of Al-Mustazi.

Al-Mustazi is named after Az-Zahir, an 13th-century Abbasid caliph and a character in the "The Hunchback's Tale" from The Book of One Thousand and One Nights

The Book of One Thousand and One Nights

One Thousand and One Nights is a collection of Middle Eastern and South Asian stories and folk tales compiled in Arabic during the Islamic Golden Age...

.