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Lat: 2.6°N, Long: 7.0°W, Diam: 35 km, Depth: 0.83 km, Rükl: 32

external image Schroter-LOIV-109H1.jpg


LPOD Photo Gallery Lunar Orbiter Images Apollo Images
Schroter' was also photographed during the mission of Apollo 16, and is seen on several orbital frames made by the Fairchild mapping/metric camera aboard CSM Caspers SIM-bay. Frame AS16-M-1412 shows Schroter a little bit "to the left" of the curved horizon's centre (a little bit "below" the horizon). Looking northward.
Research: Danny Caes


(LAC zone 59D4) LAC map Geologic map AIC map


Description: Elger

(IAU Directions) SCHROTER.--A somewhat larger formation (than Sommering), with a border wanting on the S. Schmidt draws a considerable crater on the S.E. side of the floor. It was in the region north of this object, which abounds in little hills and low ridges, that in the year 1822 Gruithuisen discovered a very remarkable formation consisting of a number of parallel rows of hills branching out (like the veins of a leaf from the midrib) from a central valley at an angle of 45 deg., represented by a depression between two long ridges running from north to south. The regularly arranged hollows between the hills and the longitudinal valley suggested to his fertile imagination that he had at last found a veritable city in the moon--possibly the metropolis of Kepler's Subvolvani, who were supposed to dwell on that hemisphere of our satellite which faces the earth. At any rate, he was firmly convinced that it was the work of intelligent beings, and not due to natural causes. This curious arrangement of ridges and furrows, which, according to Webb, measures about 23 miles both in length and breadth, is, owing to the shallowness of the component hills and valleys, a very difficult object to see in its entirety, as it must be viewed when close to the terminator, and even then the sun's azimuth and good definition do not always combine to afford a satisfactory glimpse of its ramifications. M. Gaudibert has given a drawing of it in the English Mechanic, vol. xviii. p. 638.

Description: Wikipedia


Additional Information

  • Depth data from Kurt Fisher database
    • Pike, 1976: 0.83 km
    • Westfall, 2000: 0.83 km
  • Satellite crater Schröter D shows a curious system of radial dark bands ("spokes"), on its inner slopes. See: Clementine's close-up.- DannyCaes Apr 5, 2008
  • Curious Limber shaped (or Gun Carriage shaped) depression east-northeast of Schroter, at (approximately) 3°20' North/ 4°45' West. This Limber or Gun Carriage was captured on Lunar Orbiter 1's frames 113-med and 114-med (in the upper parts of both frames). It is also noticeable on chart 17 (page 47) in the 21st Century Atlas of the Moon (Wood/ Collins) at location 3/4-F/G. Magnifying glass needed! Research Danny Caes

W.H.Pickering's observation of a possible gas eruption at Schroter

  • Near the craterlet E, on Schroter's floor, W.H.Pickering thought to have observed something like a cloud of escaping gas. Source: page 166 of Harry De Meyer's Maanmonografieen, V.V.S. (Vereniging Voor Sterrenkunde), 1969. - DannyCaes Oct 3, 2012
  • Pickering (1891-97) gives drawings of a probable eruption of steam from Schroter. Source: page 161 of T.W.Webb's Celestial Objects for Common Telescopes, Volume 1: The Solar System.- DannyCaes May 25, 2014

Possible swirl field east of Schroter?

  • The officially unnamed mare-like region east of Schroter (between Schroter and Sinus Medii) might show a possible field of Reiner Gamma type swirls.
  • It (this possible swirl field) could be investigated on the shadowless WAC mosaic of the LROC's Act-React Quick Map. See the short link to this (suspected) region: (this possible swirl field was discovered, or perhaps re-discovered, by - DannyCaes Jan 25, 2016).
  • It would be interesting to create an enhanced (high contrast) view of this region, to detect much more swirls.
  • Close-up of the section east-southeast of Schroter U, see LROC-Quickmap (shortlink) :
  • See also the page The possible swirl field east of Schroter (descriptions of the individual swirls, with nicknames).

Named for:

  • Johann Hieronymus Schröter (August 30, 1745 – August 29, 1816) was a German astronomer. In 1791 he published an important early study on the topography of the Moon entitled Selenotopographische Fragmente zur genauern Kenntniss der Mondfläche. In 1793 he was the first to notice the phase anomaly of Venus, now known as the Schröter effect, where the phase appears more concave than geometry predicts. He made extensive drawings of the features of Mars, yet curiously he was always erroneously convinced that what he was seeing was mere cloud formations rather than geographical features. Vallis Schröteri (Schröter's Valley) is also named after him. For more information about Schröter see the extended biography.
  • According to T.W.Webb, the so-called Lunar City which was discovered by Franz von Paula Gruithuisen, would have been known as Schroter (thus named by Gruithuisen himself), but, that name was transferred by Beer and Madler, who have given it to the crater which is nowadays officially known as Schroter. Source: T.W.Webb's Celestial Objects for Common Telescopes, Volume 1; The Solar System, page 119.- DannyCaes May 25, 2014

LPOD Articles


Franz von Paula Gruithuisen's "Lunar City" north of Schroter:
  • Baum, R. 1992. The Man who found a City in the Moon. Journal of the British Astronomical Association, vol. 102, no.3, pp. 157-159.
  • Birt, W. R. 1870. Gruithuisen's City in the Moon. Astronomical Register, vol. 8, pp. 179-180.
  • Hill, Harold. 1991. A Portfolio of Lunar Drawings. Pages 46-47.
  • Robinson, Walt. 2005. "Our Nearest Neighbor, X". Cosmic Messenger (Astronomical Society of Kansas City), No. 10, pp. 4-5. (PDF)
  • Sheehan, William P. and Dobbins, Thomas A. 2001. Epic Moon; a history of lunar exploration in the age of the telescope. Chapter 7: The Moon's White Cities.
  • Wanders, A.J.M. 1949. Op Ontdekking in het Maanland. Plate XX-b.
  • Webb, T.W. Celestial Objects for Common Telescopes, Volume 1: The Solar System. Pages 119-120.
  • Whitaker, Ewen A. 1999. Mapping and Naming the Moon; a history of lunar cartography and nomenclature. Pages 109-110.
  • Whitley, H. Michell. 1870. Gruithuisen's City in the Moon. Astronomical Register, vol. 8, pp. 156-157.

J. H. Schroter in the Sourcebook Project (William R. Corliss)

- In Mysterious Universe, a handbook of astronomical anomalies (1979) :
(articles in which J.H.Schroter is mentioned)
  • Page 73: The Blunted Cusp Effect and Terminator Irregularities (Mercury) (Dale P. Cruikshank, Strolling Astronomer, 1963).
  • Page 75: The Luminous Spot on Mercury in Transit (B.G.Jenkins, Monthly Notices of the Royal Astronomical Society, 1878).
  • Pages 96 and 99: On the Visibility of the Dark Side of Venus (A.Schafarik, Report of the British Association, 1873).
  • Page 110: Illusions (E.M.Antoniadi, Journal of the British Astronomical Association, 1897).
  • Page 116: The Radial Markings of Venus and their Modern Resurrection (James C. Bartlett, Strolling Astronomer, 1955).
  • Page 122: On the Observed Appearance of a Remarkable Light Spot on the Night Side of Venus (Richard M. Baum, Strolling Astronomer, 1956).
  • Page 129: Notes on the Rotation Period of Venus (E.M.Antoniadi, Monthly Notices of the Royal Astronomical Society, 1898).
  • Page 166: Abnormal Appearance of the Lunar Crescent (B.J.Hopkins, Observatory, 1883).
  • Page 198: The Linne Controversy: a look into the past (Patrick Moore, Journal of the British Astronomical Association, 1977).
  • Page 379: The Canals of Mars (E. Walter Maunder, Knowledge, 1894).
  • Page 408: Marking on Mars (Journal of the British Astronomical Association, 1900).