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Saturday, 24 December 2011

Janssen Crater and Rimae. Astronomical photographs through telescope

Photographer: Victor Lupu
Optics: Celestron C8-Newtonian telescope, plossl 20mm, 2x Barlow
Mount: CG5 (EQ5)
Device: Sony CX105 to 8x optical zoom
Total Magnification: 800x
Filter: no
Date: 08/16/2011
Location: Baia Mare, Romania
Processing: video capture, FastStone Image Viewer

Janssen, 196 km, is a large old and highly degraded crater. The northern wall was destroyed by subsequent impacts. It was heavily bombed during the time by many smaller impacts. The famous Rima Janssen is very obvious in pictures. Along the outer wall, there are numerous holes and openings, but the crater profile can still be observed with a semi-hexagonal shape, with a slight curve on the north-west. Janssen also frames Fabricius crater with a diameter of 80 km, more younger than Janssen and its central peak with a height of 2500 m.The trio closes with Metius crater, but tangential to the outer edge of Janssen.

Rima Janssen is visible on the floor, a crack that starts from Fabricius to the center of the crater, and then curves right to the edge of the southeast oj Janssen.

The picture below is for guidance, and is reversed, as seen through a telescope.

Above are images processed in Registax.


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