coronagraph

[kuh-roh-nuh-graf, -grahf]
noun Astronomy.
an instrument for observing and photographing the sun's corona, consisting of a telescope fitted with lenses, filters, and diaphragms that simulate an eclipse.


Origin:
1885–90; earlier coronograph. See corona, -graph

coronagraphic [kuh-roh-nuh-graf-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To coronagraph
Collins
World English Dictionary
coronagraph or coronograph (kəˈrəʊnəˌɡrɑːf, -ˌɡræf, kəˈrəʊnəˌɡrɑːf, -ˌɡræf)
 
n
an optical instrument used to simulate an eclipse of the sun so that the faint solar corona can be studied
 
coronograph or coronograph
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Encyclopedia Britannica
Encyclopedia

coronagraph

telescope that blocks the light of a star inside the instrument so that objects close to the star can be observed. It was invented in 1930 by the French astronomer Bernard Lyot and was used to observe the Sun's corona and prominences.

Learn more about coronagraph with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
They're building a super adaptive optics camera with a coronagraph that blocks a star's light in order to image its planet.
Images for coronagraph
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature