De Roy (crater)

De Roy
Clementine image, with De Roy at center and Chadwick in upper left
Coordinates55°18′S 99°06′W / 55.3°S 99.1°W / -55.3; -99.1
Diameter43.51 km (27.04 mi)[1]
DepthUnknown
Colongitude99° at sunrise
EponymFelix de Roy

De Roy is a lunar impact crater that is located on the far side of the Moon, just behind the southwestern limb. This crater lies within the Mendel-Rydberg Basin, a 630 km wide impact basin of Nectarian age.[2] De Roy is situated to the west of the crater Arrhenius, and east of the larger Lippmann.[3]

This crater has a worn and rounded outer rim, forming a slightly irregular circle. A pair of tiny craterlets lie along the southeast rim, and there is a narrow cleft in the northern wall. The interior floor is level and nearly featureless, with only a few tiny crater pits to mark the surface.[4]: 135 

This crater is named after Belgian journalist and amateur astronomer Felix de Roy (1883–1942),[5] who was noted for his observation of variable stars.[6] Its designation was formally adopted by the International Astronomical Union in 1970.[1]

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to De Roy.[7]

De Roy[4]: 296  Latitude Longitude Diameter
N 59.7° S 103.1° W 26 km
P 58.4° S 102.4° W 35 km
Q 58.1° S 103.6° W 22 km

The following crater has been renamed by the IAU.

References

  1. 1 2 "De Roy". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program. Retrieved 2026-07-31.
  2. ↑ Byrne, Charles J. (2008). The Far Side of the Moon. Springer. p. 74. ISBN 978-1-4899-8806-5.
  3. ↑ "LAC 135" (PDF). Gazeteer of Planetary Nomenclature. Retrieved 2026-07-31.
  4. 1 2 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.
  5. ↑ Menzel, D. H.; et al. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186. Bibcode:1971SSRv...12..136M. doi:10.1007/BF00171763. S2CID 122125855.
  6. ↑ Shears, Jeremy (2011). "Félix de Roy: a life of variable stars" (PDF). Journal of the British Astronomical Association. 121 (4): 203–214. Retrieved 2026-07-31.
  7. ↑ Grego, P. (2015). "Satellite Crater". In Hargitai, H.; Kereszturi, Á. (eds.). Encyclopedia of Planetary Landforms. New York, NY: Springer. doi:10.1007/978-1-4614-3134-3_328.
  8. ↑ "Chadwick". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program. Retrieved 2026-07-31.

Sources

  • Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
  • Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
  • Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.
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