Imaginary Picture of G 9-40 b

Display orbital revolution of G 9-40 b around the hoststar G 9-40
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Exoplanet Name : G 9-40 b
Alternate Name : "2MASS J08585232+2104344 b, EPIC 212048748 b, EPIC 212048748.01, K2-313 b, LSPM J0858+2104 b, TIC 203214081 b, WISE J085
Status : Confirmed
Radius (Rjup / Re): 0.1810 (Rjup) 2.0288 (Rearth)
Mass (Mjup / Me): 0.0160 (Mjup) 5.0870 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0385 (AU) 0.0385 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0157
Orbital Period(Observed/Estimated) 5.75 (Days Obs.) 5.12 (Days Est.)
Surface Gravity (G Earth) 1.2359
Star Radiation at Atmospheric Boundary: 9989.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 446.2 (K)
Blackbody T 0.3(K) 419.0 (K)
Blackbody T 0.7(K) 339.0 (K)
Tidally Locked Blackbody T 0.1(K) 530.6 (K)
Tidally Locked Blackbody T 0.3(K) 498.3 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : G 9-40
Alternate Name : "2MASS J08585232+2104344, EPIC 212048748, K2-313, LSPM J0858+2104, TIC 203214081, WISE J085852.46+210430.8"
Star Distance(LY) : 91.1
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 9.9 (GY)
Temperature : 3348 (K)
Spectral type : M2.5 V
UV portion[%]: 0.2
Visible portion[%]: 12.4
IR portion[%]: 87.3
Metalicity : 0.0
Absolute Magnitude: 11.6
Apparent Magnitude: 13.8
Right Ascension(RA) 134.7181
Declination (DEC) 21.0760
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
G 9-40 b
G 9-40 b

  • G 9-40 b is an exoplanet orbiting the star G 9-40, located about 91.1 light-years (27.9 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star G 9-40 has apparent magnitude of 13.8, with absolute magnitude of 11.6.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3348 with its spectral types of M2.5 V
  • In this planetary system, the extrasolar planet G 9-40 b orbits around the star G 9-40 every 5.7 days with its orbital distance of 0.04 AU ( 5759518.0 km)
  • (Projected orbit of G 9-40 b around its host star G 9-40)


  • The Star G 9-40 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.075 AU ( 11261356.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.104 AU ( 15566137.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.159 AU ( 23719348.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.233 AU ( 34904060.9 km)
  • Radiation at Planetary Boundary of G 9-40 b : 9989.61 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star G 9-40)



  • Kopparapu Recent Venus for Star G 9-40 distance : 0.085 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star G 9-40 distance : 0.108 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star G 9-40 distance : 0.104 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star G 9-40 distance : 0.115 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star G 9-40 distance : 0.211 AU
  • Kopparapu Outer Boundary for Early Mars for Star G 9-40 distance : 0.223 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star G 9-40)



  • Original Kopparapu Recent Venus for Star G 9-40 distance : 0.085 AU
  • Original Kopparapu Runaway Greenhouse for Star G 9-40 distance : 0.112 AU
  • Original Kopparapu Moist Greenhouse for Star G 9-40 distance : 0.112 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star G 9-40 distance : 0.215 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star G 9-40 distance : 0.223 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star G 9-40)



    (Position in Stellar Map of star G 9-40 and its Exoplanet G 9-40 b)



    (Zoomed position in Stellar Map of star G 9-40 and its Exoplanet G 9-40 b (zoom level 3))

    (Synthetic Spectrum of star G 9-40*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102