Lockyer (Martian crater)

Lockyer is a crater in the Elysium quadrangle of Mars. It was named after Norman Lockyer, a British astronomer (1836-1920).[1] Lockyer is surrounded by relatively smooth plains, where there are few craters. It is east of Elysium Mons and Hecates Tholus, two large volcanoes. It is south of the larger crater Adams and the Phlegra Montes.

Lockyer

Location of Lockyer Crater
Planet	Mars
Coordinates	27.84°N 160.51°E / 27.84; 160.51
Quadrangle	Elysium quadrangle
Diameter	71.35 km
Eponym	Norman Lockyer, British astronomer (1836-1920).

Impact craters generally have a rim with ejecta around them, in contrast volcanic craters usually do not have a rim or ejecta deposits. As craters get larger (greater than 10 km in diameter) they usually have a central peak.[2] The peak is caused by a rebound of the crater floor following the impact.[3]

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  Mosaic of Viking Orbiter 1 images
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  Lockyer, as seen by CTX camera on MRO
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  Lockyer's central hills, as seen by HiRISE.
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  Layers in Lockyer, as seen by HiRISE under the HiWish program.
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  Map of Elysium quadrangle. Elysium Mons and Albor Tholus are large volcanoes. The crater Lockyer is at the top of the map.