Rupes Recta.
                             Earth-based telescopic image                        Cropped Lunar Orbiter image
Larger version of above by Legault, rotated 180
Full sized  version of Lunar Orbiter image 
Rupes Recta is the "Straight Fault", formerly referred to as the "Straight Wall". The length of the fault is 110 km, its height 240-300 m, and its apparent width 2.5 km. Thus, it is not a steep scarp but a moderate slope of about 7 degrees (1:9). When illuminated by the rising Sun from the East  (less than a day after First Quarter) it casts a striking shadow. More details of the fault are visible in this closeup (upper right) photograph by Lunar Orbiter 4. The trough at the left involving many small craters is Rima Birt or Birt Rille, Birt being the largest of the two craters left of center. Notice how much rougher the fault appears in this detailed close-up.

For even more and better images, click on Section 54 Directory below.

Other Lunar Orbiter images
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This web page was created by Francis Ridge for The Lunascan Project:
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