Imaginary Picture of GJ 1265 b
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Exoplanet Name : GJ 1265 b
Alternate Name : LP 819-052
Radius (Rjup / Re): 0.1506 (Rjup) 1.6886 (Rearth)
Mass (Mjup / Me): 0.0233 (Mjup) 7.4080 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0260 (AU) 0.0260 (AU Est.)
Eccentricity : 0.0400
Orbital Period(Yrs) 0.0100
Orbital Period(Observed/Estimated) 3.65 (Days Obs.) 3.63 (Days Est.)
Star Radiation at Atmospheric Boundary: 7333.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 413.0 (K)
Blackbody T 0.3(K) 387.9 (K)
Blackbody T 0.7(K) 313.8 (K)
Tidally Locked Blackbody T 0.1(K) 491.2 (K)
Tidally Locked Blackbody T 0.3(K) 461.3 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : GJ 1265
Alternate Name :
Star Distance(LY) : 33.4
Stellar Radius(Rsun) : 0.2 (Rsun Measured)
Stellar Mass(Msun) : 0.2 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3236 (K)
Spectral type : M4.5V
Metalicity : -0.0
Absolute Magnitude: 13.6
Apparent Magnitude: 13.7
Right Ascension(RA) 333.4286
Declination (DEC) -17.6856
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+1265+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 1265 b
GJ 1265 b

  • GJ 1265 b is an exoplanet orbiting the star GJ 1265, located about 33.4 light-years (10.3 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star GJ 1265 has apparent magnitude of 13.7, with absolute magnitude of 13.6.
  • It is 0.2 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3236 with its spectral types of M4.5V
  • In this planetary system, the extrasolar planet GJ 1265 b orbits around the star GJ 1265 every 3.7 days with its orbital distance of 0.03 AU ( 3889544.6 km)
  • (Projected orbit of GJ 1265 b around its host star GJ 1265)


  • The Star GJ 1265 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.044 AU ( 6515929.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.060 AU ( 9006717.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.092 AU ( 13724243.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.135 AU ( 20195826.0 km)
  • Radiation at Planetary Boundary of GJ 1265 b : 7333.22 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 1265)



  • Kopparapu Recent Venus for Star GJ 1265 distance : 0.049 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 1265 distance : 0.062 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 1265 distance : 0.060 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 1265 distance : 0.066 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 1265 distance : 0.123 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 1265 distance : 0.130 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 1265)



  • Original Kopparapu Recent Venus for Star GJ 1265 distance : 0.049 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 1265 distance : 0.065 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 1265 distance : 0.065 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 1265 distance : 0.125 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 1265 distance : 0.130 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 1265)



    (Position in Stellar Map of star GJ 1265 and its Exoplanet GJ 1265 b)



    (Zoomed position in Stellar Map of star GJ 1265 and its Exoplanet GJ 1265 b (zoom level 3))