Questions tagged [coronograph]

Questions about telescope attachments designed to block the direct light from a star.

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"Quarter root of intensity" in coronographic plots

In excitement regarding the JWST release, I came across Krist et al, The JWST/NIRCam coronagraph: mask design and fabrication, within which there is the following plot: Fig. 9. Focal plane images ...
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2 votes
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How do HabEx's internal coronagraph and external starshade work together and complement each other? What is it that each can do that the other can't?

Limits of space telescope? links to the video 4 Future Space Telescopes NASA wants to build and that page links to The New Great Observatories. These cover the four space-based instruments proposed by ...
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1 vote
1 answer
188 views

Why is the Nancy Grace Roman Space Telescope (WFIRST) coronagraph considered "(beyond-)state-of-the-art"?

After about 01:30 in the NASA video NASA's Nancy Grace Roman Space Telescope: Broadening Our Cosmic Horizons the narrator says: To deepen its study of exoplanets ...
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10 votes
1 answer
140 views

Is it possible to see stars that are gravitationally lensed by the sun from the ground?

Roughly 100 years ago, Eddington confirmed Einstein’s general relativity theory by photographing stars behind the obscured Sun during a total eclipse. A coronograph is a device that mimics what ...
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