| 词条 | Degas (crater) |
| 释义 |
| title = Degas | image = Degas Crater View messenger full.jpg | caption = Degas crater, MESSENGER spacecraft image, 2011. Inset is Mariner 10 image from 1974. | globe = Mercury | coordinates = {{coord|37.5|N|127|W|globe:mercury_type:landmark|display=inline,title}} | diameter = 54 km | discoverer = Mariner 10 | eponym = Edgar Degas }}Degas is a rayed crater on Mercury at latitude 37.5 N, longitude 127 W. Its diameter is {{convert|54|km}}. It was named after the French impressionist painter Edgar Degas in 1979.[1] The rays consist of light colored material blasted out during the crater's formation. Craters older than Degas are covered by the ray material, while younger craters are seen superimposed on the rays.[2] Degas forms a crater pair with Brontë to the north.[3] The crater's floor contains cracks that formed as the pool of impact melt cooled and shrank. The high-reflectance material on the walls and in the central portion of the crater probably has a composition distinct from that of the crater floor and surroundings. The illumination conditions and down-slope movement of eroded material exposing fresh rock also contribute to the bright appearance.[4] References1. ^{{gpn|1458}} 2. ^{{Cite APOD |date=16 December 2000 |title=Degas Ray Crater on Mercury}} 3. ^Sobkou Planitia, at eSky 4. ^Degas Crater {{webarchive|url=https://web.archive.org/web/20140914010753/http://messenger.jhuapl.edu/gallery/sciencePhotos/image.php?page=1&gallery_id=2&image_id=547 |date=2014-09-14 }} at NASA Messenger website. This article incorporates public domain text from this US government website. External links
1 : Impact craters on Mercury |
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