Janssen giant crater on the Moon through telescope. Registax Images.

Crater Janssen, 7 frames at 95% best quality in Registax

Crater Janssen, 74 frames at 85% best quality in Registax

Crater Janssen, 156 frames at 90% best quality in Registax

Crater Janssen, 25 frames at 90% best quality in Registax

Crater Janssen, 74 frames at 85% best quality in Registax

Janssen (190 km), is a wonderful huge crater, which we discussed in many articles such as Beautiful large crater Janssen filmed with amateur astronomical telescope, where I posted the video of these images, and Live Images Of The Moon In Stunning Detail Vlacq and Janssen craters.

Too bad this crater dont have a sharp edge like that of Clavius ​​(225 km), because it would have been much seen and known by everyone. Notice the beautiful features on the floor of this crater like the "ditch" that starts from the smaller crater Fabricius (78 km), towards the center of the floor of Janssen. This is called Rima Janssen.

The floor is filled with many worn peaks, and with many satellite craters, larger and smaller.

In the center-top of the image, to southeast are two twin craters, nicely rounded, called Steinheil and Watt. These, although in images appear to be separated from each other, are in fact stacked one over the other: Steinheil (67 km), nearest, over Watt (66 km), more distant, but this is not observed in these images due to libration and phase of the Moon in that evening. Here, both craters have more than half the floor covered in shadow.

Age of the Moon: 17 days
Phase: 93% (0% = New, 100% = full)
Distance: 394.960 kmOptics: Celestron C8-Newtonian telescope, 20mm Plossl, 2x Barlow
Mount: CG5 (EQ5) motorized
Camera: Sony CX130
Filter: no
Date: 31/12/2012
Location: Baia Mare, Romania
Processing: Registax, FastStone Image Viewer

The image above was made on 16 August 2011.

Posted in: Craters-Janssen,Craters-Steinheil and Watt,Gallery-Registax