Bullialdus Crater (Bruce Rohrlach)

Contains: Solar system body or event

Bullialdus Crater

Acquisition type: Lucky imaging

Bullialdus Crater

Acquisition type: Lucky imaging

Bullialdus crater at 60 km wide is the most prominent crater on the floor of Mare Nubium. The rebound peaks in the centre of the crater rise to around 1000 metres above the crater floor, and a ridge trending southeast (towards 8 o’clock) joins these central peaks to the crater inner wall. Lunar north is bottom-right in this image.

To the NNW lies lava-flooded Lubiniezky whilst to the SW lies König. Impressions of other flooded craters can be seen ghosted into Mare Nubium, such as in the bottom-left corner of the image, and a tilted-flooded crater rim on the edge of Mare Nubium (upper right).

A sinuous wrinkle ridge formed by compressional tectonic forces that affected the Mare Nubium impact basin, trends southward from König towards Campanus. The median relief of such lunar compressional ridges with lunar mare basins is around 200m, though measurements range from around 50m to over 600m in elevation, and largely formed by load-induced subsidence of the solidifying mare impact lava.

The pseudo-hexagonal shape of many of these craters is a feature typical of impacts on many other planets and moons in our solar system.

Imaged on Sunday evening from our backyard under exceptional good seeing conditions.

Skywatcher 8 inch/f5 Newtonian, imaging camera - ASI1600mm Pro, Televue 5x Powermate for effective focal length of 7000mm (Focal ratio = 35).

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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