The mosaic below shows one of the most easily recognizable craters on the Moon, with some of the sharpest rims a large crater has on the visible half of our satellite. The crater’s name is Pythagoras, and if it would be closer to the center of the Earth-facing side of the Moon, it would rival Copernicus.

The image was acquired on the night of March 14 at 22:13 U.T. using a C11 SCT at F/20 and a ASI120MM camera with 685nm IR-pass filter. Each of the three images composing the mosaic is a stack of 1800 frames out of 3000 in 5-6/10 seeing conditions.


A larger version of the image:


I’ve imaged the same crater some time ago, on September 1, 2013 under opposite illumination.

Comparing the two views:


Both images at the same scale, and slightly larger fields of view:

September 1, 2013:

pythagoras comp a

March 14, 2014:

pythagoras comp b


(March 15, 2014)

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