Spur (lunar crater)

Not to be confused with Spurr (crater).
Spur

Apollo 15 panoramic camera image
Coordinates 25°59′N 3°40′E / 25.98°N 3.67°E / 25.98; 3.67Coordinates: 25°59′N 3°40′E / 25.98°N 3.67°E / 25.98; 3.67
Diameter 80 m[1]
Eponym Astronaut-named feature
Spur crater in background, with astronaut David Scott at left next to rover
Boulder of impact melt breccia photographed and sampled at Spur crater. Sample 15445 is believed to be a fragment of the boulder.
Genesis Rock in situ on the lunar surface prior to sampling (left of the gnomon, which was used for scale in the photos)
Planimetric map of Station 7. X indicates sample locations, 5-digit numbers are LRL sample numbers, rectangle is lunar rover (dot indicates TV camera), black spots are large rocks, dashed lines are crater rims or other topographic features, and triangles are panorama stations.

Spur is a feature on Earth's Moon, a crater in the Hadley–Apennine region. Astronauts David Scott and James Irwin visited it in 1971, on the Apollo 15 mission, during EVA 2. Spur was designated Geology Station 7.

Spur is located on the north slope of Mons Hadley Delta, about 200 m above the plain to the north. It is east of the much larger St. George crater, and about 5 km south of the Apollo 15 landing site itself.

The astronauts found the "Genesis Rock", sample 15415, at Spur. The sample contains a large clast of anorthosite, and Dave Scott said "Guess what we just found! I think we found what we came for" as he examined the sample.[2] They also found samples 15445 and 15455, so-called black and white breccias, which are thought to be impact melt breccia resulting from the Imrbrium basin impact event.[3]

The crater was named by the astronauts, and the name was formally adopted by the IAU in 1973.[1]

References

  1. 1 2 Spur, Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)
  2. ↑ Apollo 15 Lunar Surface Journal, The Genesis Rock
  3. ↑ To a Rocky Moon: A Geologist's History of Lunar Exploration. Don E. Wilhelms, University of Arizona Press (1993), p. 276. ISBN 978-0816510658
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