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Lat: 7.8°N, Long: 1.4°E, Diam: 23 km, Depth: 2.8 km, Rükl: 33, Lower Imbrian

external image normal_Ukert_LO-IV-102H_LTVT.JPG
LO-IV-102H The white dots over the southwest wall of Ukert are flaws in the Lunar Orbiter on-board development. 26-km Ukert M is the circular enclosure touching the right margin. Immediately above Ukert is 21-km Ukert B with the deeper 9-km Ukert A above that. The 6-km crater in the lower left is Pallas N.


LPOD Photo Gallery Lunar Orbiter Images Apollo Images

  • See the Clementine photo and George Tarsoudis' Earth-based view for the peculiarly triangular shape of Ukert's floor.
  • Lunar Orbiter 3's oblique north-northeast looking image 085 shows nearby Murchison and distant Ukert during local morning light.
  • Apollo 12's oblique north-looking Hasselblad AS12-52-7726 shows Ukert near the horizon. This photograph also shows Chladni (near the frame's lower left corner), and Triesnecker (near the frame's upper margin).
  • Apollo 15's oblique southward looking Fairchild camera frame AS15-M-2573 shows Ukert near the central part of the curved horizon.
  • Apollo 17's oblique southward looking Fairchild camera frame AS17-M-1675 also shows Ukert near the central part of the curved horizon (compare with Apollo 15's frame AS15-M-2573, which shows no shadows at all).
  • Research Lunar Orbiter and Apollo photography: Danny Caes


(LAC zone 59C1) LAC map Geologic map AIC map


Description: Elger

(IAU Directions) UKERT.--This bright crater, 14 miles in diameter, situated in the region N.W. of Triesnecker, is surrounded by a very complicated arrangement of mountains; and on the N. and E. is flanked by other enclosures. It has a distinct central mountain. Its most noteworthy feature is the great valley, more than 80 miles long, which extends from N.W. to S.E. on the W. side of it. This gorge is at least six miles in breadth, of great depth, and is only comparable in magnitude with the well-known valley which cuts through the Alps, E. of Plato. A delicate cleft, not very clearly traceable as a whole, begins near its N. end, and terminates amid the ramifications of the Apennines S. of Marco Polo.

Description: Wikipedia


Additional Information

The Lunar V

  • A pair of ridges to the east of Ukert produce a prominent bright V-shape along the terminator at sunrise. The center of the "V" is at about 2.2°E/8.3°N. This optical effect can be seen along the left edge of Consolidated Lunar Atlas plate D10, although not yet fully formed at a local sun angle of +0.1°. The "V" is best seen as a sunlit pattern surrounded by darkness when the local sun angle is about +1.0°. It can still be seen, but no longer surrounded by darkness, in Plate D10 where the sun angle is +5.3°. This optical effect should not be confused with Ukert V, a 3-km diameter IAU-named crater in the east arm of the optical "V". The 26-km crater inside the apex of the "V" (somewhat larger than Ukert itself) is Ukert M.
  • When the sun's latitude is near the Moon's equator, the Ukert "V" becomes prominent at nearly the same time as the Lunar X. When the Sun is at its maximum latitude north of the equator, the "V" is prominent before the "X" is clear; while the reverse is true when the Sun is south of the equator. The hills around Ukert do not form any striking pattern at sunset, although Ewen Whitaker thinks they may have been depicted as a patch of brightness lingering in the darkness beyond the waning terminator in one of the first engravings of the Moon published by Galileo Galilei (the one Whitaker calls "E4" -- see Whitaker, 1978).
  • An interesting photograph of both the Lunar X and the Lunar V (on the First Quarter Moon) was printed in T.W. Webb's Celestial Objects for Common Telescopes (Volume 1: The Solar System). It's between pages 102 and 103 (the F.Q.-moon photographed at the Lick observatory, Mount Hamilton, California). Research Danny Caes


  • Named for Friedrich August Ukert (October 28, 1780-May 18, 1851), a German history scholar, teacher and humanitarian.
  • The valley southwest of Ukert, with Ukert D in it (which is part of the Imbrium radial sculpture) is unofficially called Vallis Ukert by D.Caes.
  • Lunar V, see description above.

APOD Articles

Saturday the 10th of December 2016 is a date to remember, because the ASTRONOMY PICTURE OF the DAY (APOD) shows the well-known LUNAR X at Purbach, but... not only that, because in the text below the image the LUNAR V near Ukert is also mentioned! - DannyCaes Dec 10, 2016