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Lat: 11.0°S, Long: 29.8°E, Diam: 27 km, Depth: 2.8 km, Rükl 47

Apollo AS12-51-7464, enhanced greatly from LPI site


LPOD Photo Gallery Lunar Orbiter Images Apollo Images
Madler was also captured near the left margin of Apollo 16's orbital panoramic ITEK-camera frame AS16-P-5295 (high sun view).
Research: Danny Caes


(LAC zone 78C2) LAC map Geologic map LM map LTO map


Description: Elger

(IAU Directions) MADLER.--The interest attaching to this formation is not to be measured by its size, for it is only about 20 miles in diameter, but by the remarkable character of its surroundings. Its bright regular wall, rising 6,000 feet on the W. and only about half as much on the E., above a rather dark interior, is everywhere continuous, except at one place on the N. Here there is a narrow gap (flanked on the W. by a somewhat obscure little crater) through which a curious bent ridge coming up from the N. passes, and, extending on to the floor, expands into something resembling a central mountain. Under a high sun Madler has a very peculiar appearance. The lofty W. wall is barely perceptible, while the much lower E. border is conspicuously brilliant; and the W. half of the floor is dark, while the remainder, with two objects representing the loftier portions of the intrusive ridge, is prominently white. Under an evening sun, with the terminator lying some distance to the E., a very remarkable obscure ring with a low border, a valley running round it on the E. side, and two large central mounds, may be easily traced. This object is connected with Madler by what appears to be under a higher sun a bright elbow-shaped marking, in connection with which I have often suspected a delicate cleft. Between the obtuse-angled bend of this object and the E. wall of Madler, two large circular dark spots may be seen under a high sun; and on the surface of the Mare N. of it, a great number of delicate white spots.

Description: Wikipedia


Additional Information

  • Depth data from Kurt Fisher database
    • Pike, 1976: 2.8 km
    • Arthur, 1974: 2.67 km
    • Westfall, 2000: 2.8 km
    • Viscardy, 1985: 2.67 km
    • Cherrington, 1969: 2.4 km
  • East rim slope 44° (Pohn, 1963)
  • A thermal anomaly crater, implying a youthful age - Moore et al, 1980


  • Named for Johann Heinrich von Mädler (May 29, 1794 – March 14, 1874), a German astronomer. In 1829 Beer decided to set up a private observatory with a 95 mm refractor telescope at his home in Berlin and Mädler worked there. They produced the first exact map of the Moon, Mappa Selenographica, published in four volumes in 1834–1836. In 1837 a description of the Moon (Der Mond) was published. Both were the best descriptions of the Moon for many decades, not superseded until the map of Johann Friedrich Julius Schmidt in the 1870s. Beer and Mädler drew the firm conclusion that the features on the Moon do not change, and there is no atmosphere or water.
  • Printed as Madlar on the revised and reprinted edition of the map THE EARTH'S MOON (National Geographic Society). - DannyCaes Oct 7, 2015
  • See also the Maedler Phenomenon (Maedler's cometary appearance of Venus) which could be the same optical phenomenon observed by M.G.J.Minnaert (Minnaert's so-called blue arcs, always observable alongside bright white or red pointlike lightsources).- DannyCaes Jun 1, 2014. See also pages 126-128 in W.R.Corliss's Mysterious Universe; a handbook of astronomical anomalies (the Sourcebook Project, 1979).- DannyCaes Jun 1, 2014
  • This feature was Catalog number 4222 in Mary Blagg's Collated List, where it is noted that it was known as Theophilus A to Beer and Mädler but that both Julius Schmidt and Neison, 1876 had adopted the name Mädler. It was introduced into the original IAU nomenclature of Named Lunar Formations using that name (attributed to Schmidt).
  • See Beer: the name "Beer and Mädler" may at one time have been used for the pair of craters now known as Beer and Feuillée.
  • According to Wilkins and Moore, the collaboration between Beer and Mädler ended when Mädler left Berlin to become director of the Dorpat Observatory in Estonia. Once there Mädler concentrated on stellar motions, and appears to have done little further lunar observing.- JimMosher

LPOD Articles

A Peak at Some Peaks
A Master Mapper's Crater (Kaguya's close up)


J. H. Madler (or Maedler) in the Sourcebook Project (William R. Corliss)

- In Mysterious Universe, a handbook of astronomical anomalies (1979) :
  • Page 99: On the Visibility of the Dark Side of Venus (A. Schafarik, Report of the British Association, 1873)
  • Page 126: The Maedler Phenomenon (Richard Baum, Strolling Astronomer, 1978)