Aristillus (crater)

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Aristillus (crater)
Aristillus crater 4110 h1.jpg
Lunar Orbiter 4 image
(white spots are blemishes on original)
Coordinates 33°54′N 1°12′E / 33.9°N 1.2°E / 33.9; 1.2Coordinates: 33°54′N 1°12′E / 33.9°N 1.2°E / 33.9; 1.2
Diameter 55 km
Depth 3.6 km
Colongitude 359° at sunrise
Eponym Aristillus
Autolycus (bottom) and Aristillus (top) from Apollo 15.
NASA photo.
Aristillus is the crater in the upper right corner of this infrared image. Image courtesy of NOT and SO: M. Gålfalk, G. Olofsson, and H.-G. Florén, taken with the SIRCA camera.

Aristillus is a prominent lunar impact crater that lies in the eastern Mare Imbrium. Directly to the south is the smaller crater Autolycus, while to the southwest is the large Archimedes. The area of mare to the southwest is named the Sinus Lunicus. To the northeast are the craters Theaetetus and Cassini.

The rim of Aristillus has a wide, irregular outer rampart of ejecta that is relatively easy to discern against the smooth surface of the surrounding mare. The crater impact created a ray system that extends for a distance of over 600 kilometers. Due to its rays, Aristillus is mapped as part of the Copernican System.[1] The rim is generally circular in form, but possesses a slight hexagonal shape. The inner walls of the rim have a terraced surface, and descend to a relatively rough interior that has not been flooded with lava. In the middle of the crater is a set of three clustered peaks, which rise to a height of about 0.9 km.

In the northern outer ramparts of Aristillus is a ghost crater remnant. This is the protruding rim of an old crater that has been almost completely submerged by the lava flows of the surrounding Mare Imbrium. The southern end of the rim has been covered by the ejecta from Aristillus. Along the eastern inner wall and rim is an unusual narrow ribbon of dark material.

Detail map of Mare Imbrium's features. Aristillus is the feature marked "E".

English progressive rock band Camel named the first song on their Moonmadness album after the crater.

Satellite craters[edit]

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Aristillus.

Aristillus Latitude Longitude Diameter
A 33.6° N 4.5° E 5 km
B 34.8° N 1.9° W 8 km

References[edit]

  1. ^ The geologic history of the Moon, 1987, Wilhelms, Don E.; with sections by McCauley, John F.; Trask, Newell J. USGS Professional Paper: 1348. Plate 11: Copernican System (online)
  • Wood, Chuck (2005-04-25). "A Ribbon of Darkness". Lunar Photo of the Day. Retrieved 2006-07-21. 
  • Wood, Chuck (2007-11-07). "Lunar Stonehenge". Lunar Photo of the Day. Archived from the original on 12 November 2007. Retrieved 2007-11-07.