HR 8799

4.9 L ☉

HR 8799, also known as the variable star designation v342 Pegasi, is about 130 light -years away very young main sequence star. There is a γ Doradus variables and a λ - Bootis star. It has an apparent magnitude of 5.96 mag.

Planet

In 2008 discovered Christian Marois of the National Research Council of Canada's Herzberg Institute of Astrophysics using the Keck and Gemini telescope three planets orbiting this star. These bear the name of HR 8799 b, c and d, you could use the help of adaptive optics - the first candidates in direct infrared region - are mapped photographically. The three planets probably have the 5 - to 13 - times the mass of Jupiter and a 20 to 30 percent larger diameter. A fourth more inner circumferential planet with an orbital period of about 50 years could be directly imaged by the same research team in 2009. The oldest recording on which three of the planets could be subsequently detected directly, dates from the year 1998 by the Hubble Space Telescope.

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