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Artist’s impression of WASP-107b.jpg
Artist's impression of exoplanet WASP-107b.[1]
Discovered byD. R. Anderson et al.
Discovery date2017
Orbital characteristics
0.055 AU (8,200,000 km)[2]
5.72149[2] d
Physical characteristics
Mean radius
0.94[2] RJ
Mass0.12[2] MJ

WASP-107b is a super-Neptune exoplanet that orbits the star WASP-107. It lies 200 light-years away from Earth in the constellation Virgo.[3] Its discovery was announced in 2017 and led by D. R. Anderson and a team of colleagues via the WASP-South.[4]

Helium was discovered in the planet's atmosphere in 2018, making it the first time helium was discovered on an exoplanet.[5]


WASP-107b is a super-Neptune gas-giant exoplanet located 200 light years away from Earth in the constellation Virgo.[3] It is roughly the size of Jupiter but only one-eighth of Jupiter’s mass, making it one of the lowest density exoplanets.[3] Its radius is 0.94 times Jupiter's, making its atmosphere fluffy, and coupled with transiting a moderately bright K star makes it a target for atmosphere characterization.[6] It is eight times nearer its star than Mercury is to the Sun and orbits its star every 5.7 days.[3] With a temperature of 932 °F (500 °C), its atmosphere makes it one of the hottest known exoplanets.[3]


  1. ^ heic1809 (2 May 2018). "Hubble detects helium in the atmosphere of an exoplanet for the first time". www.spacetelescope.org. Retrieved 4 May 2018.
  2. ^ a b c d e "Planet WASP-107 b". Extrasolar Planets Encyclopaedia. 2017.
  3. ^ a b c d e Reed, Nola (2 May 2018). "An Exoplanet First! Helium Spotted on Bizarre Comet-Like World". Space.com.
  4. ^ https://www.aanda.org/articles/aa/pdf/2017/08/aa30439-17.pdf
  5. ^ Witze, Alexandra (2 May 2018). "Astronomers spot helium on exoplanet for first time". Nature.
  6. ^ "First results on the atmosphere of WASP-107b". Wide Angle Search for Planets. September 27, 2017.

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