This is an animation showing the motion of an exoplanet orbiting the star HR 8799, which is about 133 light-years away in the direction of the constellation of Pegasus. However, it was not reproduced in a simulation, and the video was created using images actually obtained using the “Keck Telescope” at the W.M. Keck Observatory on Mauna Kea in Hawaii (marked with an asterisk). The light from HR 8799 was blocked in situ by the instrument’s coronagraph).
HR 8799 is a young star about 30 million years old. It has a mass about 1.5 times that of the Sun and shines about five times as bright as the Sun. A total of four exoplanets, HR 8799 b, HR 8799 c, HR 8799 d and HR 8799 e, have been discovered so far by direct telescopic imaging of HR 8799. All four planets are more massive than Jupiter (about 6-12 times), about 15-68 astronomical units from their star HR 8799（※）It is believed to have been in a distant orbit for tens to hundreds of years.
* 1 astronomical unit (au) = approximately 150 million km, derived from the average distance from the Sun to Earth.
The above video was created by Northwestern University astrophysicist Jason Wang. When HR 8799 first imaged an exoplanet in November 2008, Wang said, he was immediately fascinated by the planetary system, and has been observing it ever since. The video was created using HR 8799 series images obtained by Wang and colleagues over a 12-year period from August 2009 to July 2021.
“Astronomical events are either too fast or too slow to be captured on video, but this video shows the planet moving according to the human time scale,” Wang said.
（Credit: Jason Wang/Northwestern University）
Northwestern University has released a video showing the motion of the exoplanets in the HR 8799 system on January 30, 2023.
- Image credit: Jason Wang/Northwestern University, WM Keck Observatory/Adam Makarenko
- northwest now – Watching distant worlds dance around their sun
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