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Bailly Basin (with Wilkins's Hare on its floor)

(unofficial name; IAU crater name: Bailly; 287 km diam.)

Lat: 66.5°S, Long: 69.1°W, Main ring diam: 300 km, Depth: 4.13 km, Rükl: 71

external image normal_Bailly.jpg

external image normal_Bailly_Basin_LIDAR_LTVT.JPG

Left: Elias Chasiotis, Right: Clementine, Clementine LIDAR Altimeter texture from PDS Map-a-Planet remapped to north-up aerial view by LTVT. The dot is the center position and the white circle the main ring position from Chuck Wood's Impact Basin Database. Grid spacing = 10 degrees.
external image bailly-large.jpg
Thumbnail: Clementine image from Map-A-Planet -- aerial viewed using LTVT (click to enlarge).
Bailly.jpg Left: Image from LRO WAC mosaic.


LPOD Photo Gallery Lunar Orbiter Images


(LAC zone 136A1) USGS Digital Atlas PDF

Basin Classification

(description of terms and most numeric basin data from Wood, C.A. (2004) Impact Basin Database)
Certainty of Existence
Wilhelms Age Group
Ring Diameters
Mare Thickness
150, 300 km



Description: Elger

(IAU Directions) BAILLY.--One of the largest wall-surrounded plains on the moon, almost a "sea" in miniature, extending 150 miles from N. to S., and fully as much from E. to W. When caught at a favourable phase, it is, despite its position, especially worthy of scrutiny. The rampart on the E., of the linear type, is broken by several bright craters. On the S.E. two considerable overlapping ring-plains interfere with its continuity. On the S.W. several very remarkable parallel curved valleys traverse the border. The W. wall, which at one point attains a height of nearly 15,000 feet, is beautifully terraced. The floor on the western side includes several ring-plains (some of which are of a very abnormal type), many ridges, and two delicate dark lines, crossing each other near the S. end, probably representing clefts.

Description: Wikipedia


Additional Information


  • The crater name honors Jean-Sylvain Bailly (September 15, 1736 – November 12, 1793), a French astronomer and orator, one of the leaders of the early part of the French Revolution. He had gained a high literary reputation and he devoted himself to writing about the history of science.
  • The impact basin is named after the crater.
  • Crater Bailly B, on the floor of Bailly, was called Hare by Hugh Percy Wilkins and Patrick Moore, but the IAU did not accept that name. Hare was a contemporary American astronomer.
  • A so-called mountain range in the neighborhood of Bailly was once known as Montes Doerfel (see also H.Hill, bibliography).

LPOD Articles

A Little Basin.
Half a Loaf.
Southwest Taper.
Especially Worthy of Scrutiny
Red & Blue on the Limb (Anaglyph)

Lunar 100

L37: Barely discernible basin.


  • Elger, T. G. 1892. Selenographical notes. The Observatory, Vol. 15, p. 257-258. (extended description).
  • Wood. C.A. Sep. 2002. Bailly and Schiller. S&T Sept 2002 v104 p10
  • Wood, C.A. April 2005. Basins of the Southwestern Limb. S&T 4/2005:70
  • Hill, Harold. 1991. A Portfolio of Lunar Drawings. Bailly: Pages 128-129. Bailly and the Doerfels: Pages 130-131.