| Titlecolor: |
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| Porter | |
| Region: | Aonia Terra |
| Coordinate Title: | Coordinates |
| Globe: | Mars |
| Coordinates: | -50.8°N -113.9°W |
| Diameter: | 105 km |
| Eponym: | Russell W. Porter |
Porter is a large-scale impact crater in the Thaumasia quadrangle on the planet Mars, situated in Aonia Terra at 50.8° south and 113.9º west. The impact caused a bowl 105km (65miles) across. The name was chosen in 1973 by the International Astronomical Union in honour of the US astronomer and explorer, Russell W. Porter (1871-1949).[1]
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]