Credit: Bruno Daversin
Explanation:
Bruno Daversin has done it again! This recent image of Hevelius is the finest ever
taken from the surface of the Earth! Ignomiously stuck near his lunar rivals Riccioli
and Grimaldi - they ignored all the names he had given to craters - Hevelius is an
106 km wide crater that once probably looked like Copernicus. But its terraces have
lost their sharpness and only one off-center peak sticks up a kilometer. Hevelius'
depth of about 2.1 km suggests that it has been filled in by some material by about
1.5 km. The surface of the floor is relatively smooth, but not dark, so if mare lavas
originally flooded Hevelius they have since been veneered with lighter material.
Alternatively, Hevelius' fill may have come airmail as ejecta from the formation
of the Orientale Basin. The shadowing on the floor south of the peak shows that the
floor is slightly domed upward. The fascinating feature about Hevelius is its system
of linear rilles. Sometimes an X pattern can be glimpsed but this marvelous image
shows that the rille pattern is more complex. The higher Sun Orbiter image shows
that the rille at the bottom right of Bruno's image cuts the rim and is continuous
with a rille on the crater floor. Two other interesting features occur on the mare
SE of Hevelius. A small fault catches the Sun and appears as a white curved line.
And a little north of the fault is a rhombus-shaped mound that might be a dome. This
is an area that's worth looking at carefully!
Related Links:
Lunar
Orbiter IV View
Technical Details:
Image acquired May 2, 2004 using the Ludiver Planetarium and Observatory 24"
Cassegrain, f/D=16.
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