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Contains:  Solar system body or event
Aristoteles and Eudoxus Craters, 


            Bruce Rohrlach

Aristoteles and Eudoxus Craters

Acquisition type: Lucky imaging

Technical card

Date:July 22, 2019

Time: 03:22

Frames: 2000

Focal length: 7000

Seeing: 4

Transparency: 8

Resolution: 12000x12471

Locations: Lysterfield, Melbourne, Victoria, Australia

Data source: Backyard


An image from the southern shores of Mare Frigoris (Sea of Cold) with spectacular craters from several periods of lunar bombardment. Mitchell (named after the American astronomer Maria Mitchell 1818-1889) is a small 30-km-wide crater of Imbrium age (3.85-3.20 billion years) which has been truncated by the 87-km-wide Aristoteles crater, an impact of Eratosthenian age (3.2-1.1 billion years). Aristoteles, named after the Greek philosopher Aristotle, displays a magnificent radial ejecta ring under the right lighting conditions. The inner walls are finely terraced with slippage features. To the south of Aristoteles lies the slightly smaller Eudoxus (named after the Greek astronomer Eudoxus of Cnidus) also with crater rim slippage features. Eudoxus has a ray system (visible only if I had zoomed out) and is of Copernican age (1.1 billion years to the present day). A lot of history in this piece of lunar real estate. Egede is a lunar impact crater flooded by lava, leaving only the polygonal rim protruding above the mare lava. Whilst plate tectonics, plate subduction, mountain building and erosion act to erase most of the same record of bombardment on the early earth, on the lunar surface the near absence of these factors act to preserve this long and violent history. The moon itself formed from an even earlier gargantuan collision (the Impact Hypothesis) between a planetary body known as Theia that was about the size of Mars, around 4.5 billion years ago during the Hadean Era, and the earth, with the impact debri gravitationally coalescing to form the moon.

SW 8 inch/f5 ASI224mc 5xTelevue Powermate (Autostakkert, Registrax, Lightroom, Canvas).



Bruce Rohrlach
License: None (All rights reserved)


Aristoteles and Eudoxus Craters, 


            Bruce Rohrlach