Haldane is a

lunar Lunar most commonly means "of or relating to the Moon". Lunar may also refer to: Arts and entertainment * ''Lunar'' (series), a series of video games * "Lunar" (song), by David Guetta * "Lunar", a song by Priestess from the 2009 album ''Prior t ...

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact craters ...

that is located in

Mare Smythii Mare Smythii (Latin for "Smyth's Sea") is a lunar mare located along the equator on the easternmost edge of the Moon's near side. It is named for the 19th-century British astronomer William Henry Smyth. The Smythii basin where the mare is located ...

, near the eastern limb of the

Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...

. The visibility of this formation is affected by libration, and even under favorable conditions it is highly foreshortened. It lies just to the west-northwest of the crater

Runge Runge may refer to: Locations *Runge, Texas, a town, United States *Runge (crater), a lunar crater Mare Smythii Other uses *Runge Newspapers, a newspaper chain in Ontario, Canada *Inspector Heinrich Runge (though it is more often spelled a ...

, and to the east of Carrillo. The interior of this floor has been flooded by

lava Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or un ...

, leaving only a low rim projecting up through the

lunar mare The lunar maria (; singular: mare ) are large, dark, basaltic plains on Earth's Moon, formed by ancient asteroid impacts on the far side on the Moon that triggered volcanic activity on the opposite (near) side. They were dubbed , Latin for 'seas' ...

. This rim is broken along the northwest face, leaving a gap into the interior. In the eastern half of the inner floor is a semi-circular feature that is concentric with the outer wall. There is also a low central ridge offset to the east of the interior midpoint. Haldane is a somewhat extreme example of many fracture-floored craters in Mare Smythii. The depth of Haldane is approximately 900 m from the lowest point on the floor of its northwestern quadrant to the highest point on the southwestern part of its outer rim.LTO-81B1 Haldane
Lunar Topographic Orthophotomap (LTO) Series, Defense Mapping Agency, Scale: 1:250,000. 1973.

References

* * * * * * * * * * * * {{refend Impact craters on the Moon