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Lat: 6.45°N, Long: 28.02°W, Diam: 14.16 km, Depth: 2.86 km, Rükl: 30

external image normal_Hortensius_LO-IV-133H_LTVT.JPG
LO-IV-133H Hortensius is the classic flat-bottomed circular crater below center. The 7-km diameter circular crater in the lower right is Hortensius C, and one shallow 4-km crater in the upper left is named after Milichius, as shown. None of the domes, which have what appear to be volcanic caldera at their summits, are officially named, although on chart SLC E4 of the System of Lunar Craters (1966) they had the Greek-lettered designations shown. This cluster was unofficially called the Schlumberger domes. The "six domes" referred to by Phillips (1989) include the one to the west (left) of Omega and a difficult to see one (with no summit pit) to the east of Phi. He also regarded the structure on the groove to the east of this as a dome. Moore and Cattermole saw Phi and its companion-without-summit-pit to the east as a single heart-shaped structure (Phillips, 1989, Fig. 15).


LPOD Photo Gallery Lunar Orbiter Images Apollo Images

  • Frame 3123, made by Lunar Orbiter III, shows Hortensius and the nearby domes. Research: Danny Caes.
  • Frame 2146, made by Lunar Orbiter II, shows a small hillock (Hortensius Rho; 3°45' north/ 27°50' west) with craterlet on top. Research: Danny Caes.
  • The domefield near Hortensius was a favourite target for detailed lunar drawings made by René Schlumberger; a dedicated observer of that area. A drawing made by him (of the Hortensius domefield) was included in the Dutch book Op Ontdekking in het Maanland by A.J.M. Wanders (1949), Plate XIX. Research: Danny Caes.
  • This is probably the same as the wonderful drawing by Schlumberger dated 8-4-1930 that appears on p. 127 of Walter Goodacre's The Moon (also reproduced as Figure 12 in Phillips, 1989). - tychocrater Jun 24, 2008


(LAC zone 58D1) LAC map Geologic map AIC map



(IAU Directions) HORTENSIUS.--This brilliant crater, about 10 miles in diameter, is remarkable for its depth, and as being a ray-centre surrounded by a nimbus of light. It has a central mountain, and Schmidt shows a minute crater on the outer slope of the S. wall. The former is a test object.



Additional Information

  • IAU page: Hortensius
  • Depth data from Kurt Fisher database
    • Pike, 1976: 2.86 km
    • Arthur, 1974: 2.86 km
    • Westfall, 2000: 2.86 km
    • Viscardy, 1985: 2.86 km
  • From the shadows in LO-IV-133H, the east rim of Hortensius is from 2500-2900 m above the flat-looking floor. - Jim Mosher
  • Hortensius A is a thermal anomaly crater, implying a youthful age - Moore et al, 1980


  • Named for Martin van den Hove (Martinus Hortensius) (1605 — August 7, 1639), a Dutch astronomer and mathematician. Van den Hove developed a method for measuring the diameters of planets based on the measured visual angle that his telescope embraced. Van den Hove corresponded with René Descartes, Marin Mersenne, Pierre Gassendi, Christiaan Huygens, and Galileo Galilei.
  • This name has continued unchanged since its original use for this feature on Riccioli's map (Whitaker, p. 218).
  • None of the domes near Hortensius seem to have been named in the the original IAU nomenclature of Named Lunar Formations. Four of them were given Greek-lettered names in the System of Lunar Craters charts; but these were dropped by the IAU in 1973, and none of them have been officially renamed.
  • D. Caes calls the domefield near Hortensius The Hortensius domefield, a name rather similar to that under which it is known in the Lunar 100.
  • Amateur astronomer Jim Phillips (1989, p. 63) dubbed the six most prominent domes immediately north of Hortensius the Schlumberger Domes in recognition of the early drawing of them by René Schlumberger. This is strictly an unofficial name, but has appeared in several subsequent ALPO publications. - Jim Mosher

LPOD Articles

Lunar 100

L65: Dome field north of Hortensius.


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