| 词条 | Eminescu (crater) |
| 释义 |
| title = Eminescu | image = Eminescu_crater_EN0108828468M.jpg | image_size = 250px | caption = Eminescu is the prominent crater near the center of this image. | globe = Mercury | coordinates = {{coord|10.79|N|245.87|W|globe:mercury_type:landmark|display=inline,title}} | coordinates_footnotes = [1] | diameter = 125 km[1] | eponym = Mihai Eminescu }}Eminescu is a peak ring crater on Mercury {{convert|125|km|mi|sp=us}} in diameter. Since there are very few later craters superposed on it, Eminescu appears to be a young crater formed around one billion years ago.[2] It has a transitional morphology between larger more complex impact basins like Raditladi and smaller simpler central peak craters.[3] The impact ejecta and chains of secondary craters extend as far as one radius from the rim. There are no bright or dark crater rays, with the crater rim itself being higher in altitude than the surrounding cratered plains. The crater walls are degraded by slumping, forming distinct blocks of material. The crater floor consists of complex structures, including ejecta deposits, impact melts and possibly units placed by effusive volcanism.[3] The bright bluish central peaks within the crater are arranged in a circular pattern forming a peak ring.[2] The peaks exhibit unusual color characteristics similar to the bright crater floor deposits (BCFD) seen in other craters on Mercury. The crater floor both inside and outside the peak ring is covered by dark smooth plains, which appear to surround it. These plains are probably volcanic in origin. Further from the peak ring near the crater walls, there are areas covered by a bright material. They are subdivided into bright smooth plains in the north-east corner of Eminescu, and mottled and rough terrain elsewhere. The bright units may be impact melts.[3] The crater is named after Mihai Eminescu, a Romanian poet (1850–1889).[1] References1. ^1 2 {{cite web|publisher=USGS|title=Eminescu|url=http://planetarynames.wr.usgs.gov/Feature/14388|accessdate=July 17, 2010}} {{Mercury (planet)}}2. ^1 {{cite web|url=http://photojournal.jpl.nasa.gov/catalog/PIA10610|title=PIA10610: Now Introducing: Eminescu|accessdate=July 17, 2010|date=April 17, 2008|publisher=NASA}} 3. ^1 2 {{cite journal|last=Schon|first=S.C.|author2=Head, J.W. |author3=Prockter, L.M. |author4= MESSENGER Science Team |title=Eminescu and the transition to peak-ring basins on Mercury|year=2010|journal=41st Lunar and Planetary Science Conference|volume=|page=1263|bibcode=2010LPI....41.1263S}} 1 : Impact craters on Mercury |
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