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Wednesday, 9 March 2011

Janssen crater

Photographer: Victor Lupu
Optics: Celestron C8-Newtonian reflector telescope, 20mm plossl, 2x Barlow
Mount: CG5 (EQ5)
Device: Sony HDR CX105
Filter: No
Date: 09/02/2011
Location: Baia Mare, Romania
Processing: video capture

      Janssen crater (190 km.), is the largest in the bottom left in photo.
      Janssen is an old impact crater located in the high region in the south-east of the Moon. The entire structure was heavily hit by more impacts. The outer wall is divided in several locations, but the outline of the crater can still be observed. The wall forms a distinctive hexagonal shape on the lunar surface.
       Fabricius crater (78 km.) lies entirely in Janssen's western wall. A number of other smaller craters, but noticeable marks the crater floor. On the south-east wall is a smaller crater Lockyer (34 km.), Lockyer F and D, all three shot to the east line of Janssen.
       Janssen crater name is given by the famous french Jules Janssen, an astronomer who, along with the english scientist Joseph Norman Lockyer, is responsible for the discovery of helium gas.


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