CLASS B CONE
LRO image excerpt from April 9 LPOD
A recent LPOD image from LRO showed a small elongated volcano cone east of Flamsteed. I determined it's position (42.42° W and 4.86° S), and using the image time of 2010-01-10 UT 16:14:44, determined that the corresponding solar altitude above the cone is 9.94°. The image was then imported and rotated until the axes of the shadows appeared horizontal. The scale of the image corresponds to 0.0738 km per pixel computed based on the diameter of the crater Flamsteed of 20 km. The diameter for the elongated cone is 2.28 km (North South direction) x 0.74 km (East-West direction). Based on measurements of the shadow length (7.7 pixels corresponding to 0.568 km), the height of the flank of the lunar cone amounts to 98 m ± 10 m. The slope is computed to be 4.9° for the steepest part of the cone. The shape of the cone fits the class B of cinder cones in the San Francisco Volcanic Field in northern Arizona in the scheme used by Breed (1964 - Morphology and lineation of cinder cones in the San Francisco volcanic field. Museum of northern Arizona bulletin N.40, 65-71).
Raffaella Lena
ModificaDOME CLOSEUP
LRO WAC image processed byRick Evans (I think)
Milichius (bottom right) is a standard small impact crater 12 km in diameter, but it has been a valuable guidepost for the nearby prominent - at least as much as they can be - dome. Named Milichius Pi on the System of Lunar Craters charts, this feature has been known at least since 1931 when Elger called it a dome. It was one of the early
features studied by the Geologic Lunar Research group who labelled it M12 and found it to be 9.7 km in diameter and about 230 m high. It has a very common dome shape, a flattened plateau surrounded by acarp (but still a relatively low slope), with a rimless crater on top. To the upper left is another common type of dome. This seems to have a more gentle continuous slope and less flattening across the top. Possibly it too is circled by a scarp, but if so it has been covered by what appears to be subsequent lava flows. This dome is crossed by a rille which has two or three
volcanic cones at its northern end. GLR also studied the largest cone, which they call MC1, and found it to be 1.8 km wide and 61 m high. These cones probably formed by a slight escape of magma from the underlying dike that wedged apart this piece of crust, causing the rille to form.
Chuck Wood
Related Links
Rükl plate 30
Consolidated Lunar Dome Catalogue
