Lacus Mortis (Bruce Rohrlach)

Contains: Solar system body or event

Lacus Mortis

Acquisition type: Lucky imaging

Lacus Mortis

Acquisition type: Lucky imaging

Lacus Mortis (Lake of Death) is a 151 km wide plain of basaltic lava in a flooded crater on the NE part of the moon - just south of Mare Frigoris (Sea of Cold). At around 4 billion years of age it is one of the oldest known lunar impact structures. Numerous cross-cutting rilles lie on the western part of Lacus Mortis (southern part of image). The principal rille is Rima Bürg which runs for 60 km across the floor of Lacus Mortis. Another shorter rille which starts from the midpoint of Rima Bürg and runs due south (to the right) towards the edge of Lacus Mortis actually starts as a rille and then transitions to a fault with west-side-down (foreground-down) displacement. This fault scarp, at lunar sunset on Day 19 of the lunar cycle when this image was taken, results in this fault scarp being strongly illuminated from the west (see bright left-to-right line on the floor of Lacus Mortis with the foreground displaced downward towards the west (bottom of image). The centrepiece of Lacus Mortis, just east of the mid-point of Lacus Mortis, is the 1800m deep crater Bürg with terraces and a central mountain peak that is hidden in the late afternoon shadow within the crater.

21st July 2019, Lysterfield, Melbourne, Australia.

Skywatcher 8inch/f5, ASI224mc, Televue 5x Powermate.

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