| Antoniadi | |
|---|---|
| Planet | Mars |
| Region | Syrtis Major Planum |
| Diameter | 394.0 |
| Eponym | Eugène Michel Antoniadi |
Antoniadi is a crater on Syrtis Major Planum, Mars, located at 21.5° north latitude and 299.2° west longitude. It is 394 km long and was named after Eugène Michael Antoniadi, a Turkish-born French astronomer (1870-1944).[1]
There is evidence that Antoniadi Crater once contained rivers and lakes.[2] The picture below shows an inverted channel in Antoniadi, as seen by HiRISE. Inverted channels formed from accumulated sediments that were cemented by minerals. These channels eroded into the surface, then the whole area was covered over with sediments. When the sediments were later eroded away, the place where the river channel existed remained because the hardened material were resistant to erosion.[3]
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Some places on Mars show inverted relief. In these locations, a stream bed may be a raised feature, instead of a valley. The inverted former stream channels may be caused by the depositon of large rocks or due to cementation. In either case erosion would erode the surrounding land and leave the old channel as a raised ridge because the ridege will be more resistant to erosion. An image below, taken with HiRISE of Antoniadi Crater shows sinuous ridges that are old channels that have become inverted.[4]