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HR 8799 Copy

25 Aug 2017, 07:12 UTC
HR 8799  Copy

HR 8799 is a planetary system made of a star and at least four directly imaged giant planets. Given its estimated age, about 30 million years, it is very young compared to the Solar System (4.5 billion year old).
The star is larger, more massive and hotter than the Sun: 1.34 solar radii, 1.47 solar masses, and 7430 kelvins (7160 °C). Also, Its spectral type is complex: kA5 hF0 mA5 V λ Boo.
The four planets were discovered by direct imaging: in other words, we managed to get pictures of these objects. You can watch below a video showing these images and see the actual movement of the planets around the star between July 2009 and July 2016.
 

Name
Mass(MJ)
Radius(RJ)
Period(days)
Discovery(date)

HR 8799b
7
1.2
164250
2008

HR 8799c
10
1.3
82145
2008

HR 8799d
10
1.2
41054
2008

HR 8799e
9

18000
2010

 
Real images here: https://apod.nasa.gov/apod/ap170201.html
 
 
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