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Ammonius (aka Lyot) (on the floor of Ptolemaeus)

(formerly Ptolemaeus A)

Lat: 8.5°S, Long: 0.8°W, Diam: 8 km, Depth: 1.86 km, Rükl: 44

external image normal_Ammonius_AS16-M-2810_LTVT.JPG


LPOD Photo Gallery Lunar Orbiter Images Apollo Images

  • Ptolemaeus A (Ammonius) was captured on Ranger 8's Frame P002 (third photograph in this frame, at lower left).
  • One of Apollo 12's orbital Hasselblad photographs of Ammonius is included in the book Full Moon by Michael Light and Andrew Chaikin. This photograph (AS12-51-7506, as Plate 43) looks almost the same as AS12-51-7507. Both photographs show the bowl-shaped crater Ammonius in the foreground, while the lunar module (LM Intrepid) is seen near the lunar horizon.
  • Research Ranger 8 and Apollo 12 photography: Danny Caes


(LAC zone 77D2) LAC map Geologic map LM map LTO map


Ammonius is the most prominent crater on the floor of Ptolemaeus.

Description: Wikipedia


Additional Information


  • Named for Ammonius (unkn.-c. A.D. 517-526), a Greek philosopher.
  • The name Ptolemaeus A was part of the original IAU nomenclature of Blagg and Müller (Catalog Entry 2963). The name is attributed to Mädler.
  • This replacement name for a formerly lettered crater was provisionally introduced on LTO-77D2 (Oct. 1974), for which it served as the chart title. It was approved in 1976 (IAU Transactions XVIB). - Jim Mosher
  • Hugh Percy Wilkins and Patrick Moore proposed calling this crater Lyot, but the I.A.U. did not approve the name. The name Lyot was later used for a crater near the Moon's southeastern limb.

LPOD Articles


Ptolemaeus A ("Lyot"): THE MOON by H.P.Wilkins and P.Moore.