Balmer (crater)

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Balmer

LRO image
Coordinates	20°06′N 70°36′E / 20.1°N 70.6°E / 20.1; 70.6
Diameter	112 km
Depth	None
Colongitude	288° at sunrise
Eponym	Johann J. Balmer

Balmer is the lava-flooded remains of a lunar impact crater. Only the heavily worn southern and eastern sections of the crater still survive; the remainder being overlaid by a lava flow that joins to the nearby mare. Balmer lies to the east-southeast of the crater Vendelinus.

Balmer was considered a Constellation Region of Interest.^[1] Light plains deposits overly mare basalt, as evidenced by multiple dark-halo craters.^[2]

• 
  Oblique view facing west from Apollo 17
• 
  One of the more interesting features within Balmer is this 1-km wide impact crater with a prominent ray system, photographed by Apollo 14
• 
  LRO image of the 1-km crater with rays within Balmer

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Balmer.

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• Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.

• Media related to Balmer (crater) at Wikimedia Commons