Noun
English Wikipedia has an article on:coronagraphWikipedia
coronagraph (plural coronagraphs)
(astronomy) A telescope that has an attachment which blocks out the direct light from the sun or other star, allowing examination of the corona and the detection of exoplanets
As an orange dwarf, with a mass just under that of the Sun, it's also not tremendously bright, which means it's well suited for observation with a coronagraph. Source: Internet
Using a coronagraph on the Subaru telescope in Hawaii in 2005, astronomers were able to further constrain the size of a planet orbiting Vega to no more than 5–10 times the mass of Jupiter. Source: Internet
Local observations A picture of the solar corona taken with the LASCO C1 coronagraph. Source: Internet
In this movie, the inner coronagraph (designated C2) is combined with the outer coronagraph (C3). Source: Internet
The corona is visible to the SOHO/LASCO coronagraph instruments, which block the bright disk of the Sun so the significantly fainter corona can be seen. Source: Internet
To obtain the images, the research team ran a special three-day campaign wherein the instrument took more frequent and longer-exposure images than it usually does, allowing more time for light from faint sources to be detected by the coronagraph. Source: Internet