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- A vortex coronagraph is a type of optical instrument for telescopes that blocks out the glare of bright objects (like stars) so that smaller objects near them can be seen. For example, extrasolar planets near their host star as seen from Earth or space telescopes in Earth's solar system. It is a type of coronagraph. In 2005 a paper described a method for astronomy, by which the light of a parent star could be blocked, while keeping the light from nearby but dimmer exoplanets (or whatever the companion is). Up until the year 2010, telescopes could only directly image exoplanets under exceptional circumstances. Specifically, it is easier to obtain images when the planet is especially large (considerably larger than Jupiter), widely separated from its parent star, and hot so that it emits intense infrared radiation. However, in 2010 a team from NASAs Jet Propulsion Laboratory demonstrated that a vortex coronagraph could enable small telescopes to directly image planets. They did this by imaging the previously imaged HR 8799 planets using just a 1.5 m portion of the 5 meter Hale Telescope. Vortex coronographs have been used in conjunction with adaptive optics for astronomy. A vortex coronograph was used on the Keck Observatory by 2017. The VC was installed on infrared camera at Keck, and allowed bodies to be viewed 2–3 times closer to a parent star than before. HIP 79124 B was imaged at a distance of 23 astronomical units from its host star with a vortex coronograph on the Keck telescope, and it was called a brown dwarf. Next generation VCs are able to dim multiple sources of light. It will be thus possible to use them to image planets around multi-star systems. (en)
- 旋風星冕儀（Vortex coronagraph），或有翻譯為渦狀日冕儀，是一種可以觀測極明亮物體周圍暗淡物體的光學儀器，而這些暗淡物體可能被明亮物體所發出光芒遮蓋，例如恆星周圍的太陽系外行星就可用該儀器以地球或太空望遠鏡直接攝影。該儀器屬於日冕儀的一個類型。 (zh)
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- 旋風星冕儀（Vortex coronagraph），或有翻譯為渦狀日冕儀，是一種可以觀測極明亮物體周圍暗淡物體的光學儀器，而這些暗淡物體可能被明亮物體所發出光芒遮蓋，例如恆星周圍的太陽系外行星就可用該儀器以地球或太空望遠鏡直接攝影。該儀器屬於日冕儀的一個類型。 (zh)
- A vortex coronagraph is a type of optical instrument for telescopes that blocks out the glare of bright objects (like stars) so that smaller objects near them can be seen. For example, extrasolar planets near their host star as seen from Earth or space telescopes in Earth's solar system. It is a type of coronagraph. In 2005 a paper described a method for astronomy, by which the light of a parent star could be blocked, while keeping the light from nearby but dimmer exoplanets (or whatever the companion is). Vortex coronographs have been used in conjunction with adaptive optics for astronomy. (en)
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- Vortex coronagraph (en)
- 旋風星冕儀 (zh)
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