The western limb of the almost full moon (95% illuminated) (Niall MacNeill)

Contains: Solar system body or event

The western limb of the almost full moon (95% illuminated)

Acquisition type: Lucky imaging

The western limb of the almost full moon (95% illuminated)

Acquisition type: Lucky imaging

After imaging crater Gassendi, I went to successively wider fields of view. For this one I used my ZWO ASI 1600MC camera, which has still a very good pixel resolution (0.2"), so perhaps consistent with an overall resolution of 0.5 arc secs.

With Gassendi in the mid lower right in the image you can see Mare Humorum and the surrounding terrain. The upper part of the image is of course dominated by the spectacular Tycho crater (diam 86kms, depth 4.8kms), with its huge ray system spreading right around the moon. This is a very young crater and its ejecta hasn’t had enough time in only 108 million years to darken due to micrometeorite weathering and the effect of the solar wind, to match the surrounding darker terrain. At lower left is the famous crater Copernicus (diam 93kms, depth 3.8kms). Again it has a substantial ray system and is estimated to be 800 million years old.

The elongated lava filled crater at upper right is Schiller which is 180kms long. It is probably the result of two merged impact craters. Below it and to the right in deep shadow is the massive crater Schickard (227kms).

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The western limb of the almost full moon (95% illuminated)

The western limb of the almost full moon (95% illuminated)

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The western limb of the almost full moon (95% illuminated)

The western limb of the almost full moon (95% illuminated)

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