G 9-40 b

G 9-40 b
Discovery[1]
Discovery dateDecember 2019
radial velocity and transit
Designations
K2-313 b[2]
Orbital characteristics[3]
0.04180±0.00064 AU
Eccentricity0
5.7459982(20) d
Inclination89.03°±0.10°
Physical characteristics[3]
1.900±0.065 R🜨
Mass4.00±0.63 M🜨
Mean density
3.20+0.63
−0.58 g/cm3
10.8±1.8 m/s2
Temperature440.6±7.6 K (167.5 °C; 333.4 °F, equilibrium)

G 9-40 b is a sub-Neptune exoplanet that has an orbital period of 5.7 days. The host star is a red dwarf located 91 light-years (28 parsecs) away from Earth in the constellation Cancer.[4] The planet was discovered in 2019.[5][6] The planet's density is too low for a rocky composition, suggesting that it is either water-rich or has a significant hydrogen atmosphere.[3]

  1. ^ Cite error: The named reference Stefansson2019 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference NASAExoplanetArchive was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Luque2022 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  5. ^ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2021-03-23.
  6. ^ "The Extrasolar Planet Encyclopaedia — G 9-40 b". Extrasolar Planets Encyclopaedia. Retrieved 28 March 2021.