Sinus Iridum

Lat: 44.1°N, Long: 31.5°W, Diam: 259 km, Depth: , Rükl: 10, Lower Imbrian
external image Sinus%20Iridium.jpg
Left: Topographic WAC view from LROC.
Right: Eric Roel


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  • Sinus Iridum is also seen on an extraordinary painting which was made by Chesley Bonestell, for the magazine Collier's (see: the fourth painting on page Collier's 2 in Fabio Femino's Fantascienza website). Research: Danny Caes
  • A remarkable color photograph of the Waning Crescent Moon, made by Dominique Dierick shows the opposite phenomenon of Patrick Moore's Jeweled Handle Effect (see Eric Roel's photo above). The shadowed Montes Jura and the partially illuminated Sinus Iridum (sunset light, as seen in Dominique's photo) was also depicted by Harold Hill in his subtle drawing on page 88 of the book A Portfolio of Lunar Drawings. Research: Danny Caes
  • Sinus Iridum sunrise sequence


(LAC zone 24A2) LAC map Geologic map


Description: Wikipedia

Sinus Iridum

Additional Information

  • IAU page: Sinus Iridum
  • Depth data from Kurt Fisher database
    Cherrington, 1969: -0.4 km
  • Age estimate of 3.84 to 3.7 billion years based on crater counts (Wagner et al, 2002, Stratigraphic sequence and ages of volcanic units in the Gruithuisen region of the Moon. J. Geophys. Res. 107, E11, 5104 ).
  • IAU diameter of 235 km incorrect; 259 km comes from System of Lunar Craters.
  • Small ghost crater at 45° North/ 32° West. Discovered by Danny Caes via LOIV-145-h2.
  • Chain of depressions at 44°15' North/ 32°40' West. Discovered by Danny Caes via LOIV-145-h2.
  • Curious elongated trough near Promontorium Heraclides, see left margin of LOIV-139-h2.

Jewelled Handle

  • Observer's note: when the sunrise terminator is located at Sinus Iridum and the arc-shaped Montes Jura, the Jewelled Handle effect is in its full glory (this is a remarkable Clair-Obscur phenomenon described by Sir Patrick Moore in his moonbooks). The Jewelled handle effect is one of the most binocular-friendly lunar Clair-Obscur phenomena! (you really don't need a powerful telescope to observe it!). Exactly 24 hours earlier the sunrise terminator was located at Copernicus. See LPOD 24 Hours.


  • Called Sinus Iridum by Riccioli (Bay of Rainbows), Sinus Geometricus by Langrenus, and Sinus Apollinis by Hevelius.
  • The pronounced wrinkle ridge running immediately east of the bowl-shaped crater Laplace A (at the eastern part of S.Iridum) is unofficially called Dorsum Laplace A by - DannyCaes DannyCaes Sep 10, 2011.

Lunar 100

L14: Very large crater with missing rim.

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This page has been edited 26 times. The last modification was made by - DannyCaes DannyCaes on Aug 24, 2015 11:31 am - afx3u2