Janssen
                            Earth-based telescopic image                          Cropped Lunar Orbiter image
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Larger version of above by Legault
 Janssen_m.jpg 
Full-sized version of Lunar Orbiter image LO4-71H2
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Brief
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.
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Other Lunar Orbiter images
No others available 
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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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