Earth-based telescopic image                          Cropped Lunar Orbiter image
Larger version of above by Legault
Full-sized version of Lunar Orbiter image LO4-71H2
Janssen is a large walled plain with considerable eroded walls, 190 km in diameter. In the photo at top left Janssen is the larger & shallow one with crtaers inside. On the floor, there is a mountain massif and a system of rilles. The largest of the rilles is visible through a small telescope, its length is 110 km and it is up to 6 km wide. The cropped overhead LO4 image shows Janssen covering the full SW quadrant.
Other Lunar Orbiter images
No others available 
For the latest information and images regarding this section, including Apollo Hasselblad (H), Metric (M), and Panoramic (P) images, go to:
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This web page was created by Francis Ridge for The Lunascan Project:
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