Diophantus (crater)

Diophantus is a lunar impact crater that lies in the southwestern part of the Mare Imbrium. It was named after ancient Greek mathematician Diophantus.[1] It forms a pair with the larger crater Delisle to the north. Diophantus has a wide inner wall and a low central rise. To the north of Diophantus is the sinuous rille designated Rima Diophantus, named after the crater. Diophantus C lies near the exterior of the southwest wall.

Diophantus
Apollo 15 image
Coordinates27.6°N 34.3°W / 27.6; -34.3
Diameter19 km
Depth3.0 km
Colongitude34° at sunrise
EponymDiophantus
Oblique view of Diophantus from Apollo 17, at low sun angle, with the smaller Diophantus C at left.
High-resolution view of dark streaks in the wall of Diophantus, showing downslope movement of buried subsurface deposits.
The craters Delisle (above) and Diophantus (below) from Apollo 15. Mons Delisle is to the left of Delisle, and Rima Diophantus lies between Delisle and Diophantus. Note also bright rays extending from the tiny crater Samir.

Rima Diophantus

This cleft follows a generally east–west path across the Mare Imbrium. It is centered at selenographic coordinates 31.0° N, 32.0° W, and has a maximum diameter of 150 km.

Small Craters

Several tiny craters north of Diophantus have been assigned names by the IAU. These are listed in the table below.

Crater Coordinates Diameter Name source
Isabel 28.2°N 34.1°W / 28.2; -34.1 1 km Spanish feminine name
Louise 28.5°N 34.2°W / 28.5; -34.2 0.8 km French feminine name
Samir 28.5°N 34.3°W / 28.5; -34.3 2 km Arabic masculine name
Walter1 28.0°N 33.8°W / 28.0; -33.8 1 km German masculine name
1 Not to be confused with the large crater Walther in the southern hemisphere which is misidentified as 'Walter' in some publications
High-resolution image of Samir (left) and Louise from Apollo 15 panoramic camera.

The crater Samir has bright rays that extend for over 70 km.

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 Diophantus.

Diophantus Latitude Longitude Diameter
B 29.1° N 32.5° W 6 km
C 27.3° N 34.7° W 5 km
D 26.9° N 36.3° W 4 km

The following craters have been renamed by the IAU.

gollark: That seems plausible.
gollark: Alternatively, the one above is just going to be current position - width I think?
gollark: Then just generate adjacent x/y coordinates and map them back to memory location.
gollark: You should store the grid dimensions with the grid somewhere, and make your update code iterate over the x/y and not just memory location directly.
gollark: Or just know the width and do some maths.

References
  1. "Diophantus (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
  • Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.CS1 maint: ref=harv (link)
  • Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.CS1 maint: ref=harv (link)
  • Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 978-0-936389-27-1.CS1 maint: ref=harv (link)
  • McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24.CS1 maint: ref=harv (link)
  • Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (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.CS1 maint: ref=harv (link)
  • Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 978-0-304-35469-6.CS1 maint: ref=harv (link)
  • Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.CS1 maint: ref=harv (link)
  • Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.CS1 maint: ref=harv (link)
  • Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revised ed.). Dover. ISBN 978-0-486-20917-3.CS1 maint: ref=harv (link)
  • Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6.CS1 maint: ref=harv (link)
  • Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.CS1 maint: ref=harv (link)
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