Imaginary Picture of GJ 1252 b

Display orbital revolution of GJ 1252 b around the hoststar GJ 1252
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Exoplanet Name : GJ 1252 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1064 (Rjup) 1.1930 (Rearth)
Mass (Mjup / Me): 0.0066 (Mjup) 2.0920 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0092 (AU) 0.0092 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0014
Orbital Period(Observed/Estimated) 0.52 (Days Obs.) 0.52 (Days Est.)
Surface Gravity (G Earth) 1.4700
Star Radiation at Atmospheric Boundary: 319497.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1061.1 (K)
Blackbody T 0.3(K) 996.5 (K)
Blackbody T 0.7(K) 806.3 (K)
Tidally Locked Blackbody T 0.1(K) 1261.9 (K)
Tidally Locked Blackbody T 0.3(K) 1185.0 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Spectrum
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : GJ 1252
Alternate Name :
Star Distance(LY) : 66.5
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3458 (K)
Spectral type : M4
UV portion[%]: 0.3
Visible portion[%]: 13.4
IR portion[%]: 86.3
Metalicity : 0.1
Absolute Magnitude: 10.5
Apparent Magnitude: 12.0
Right Ascension(RA) 306.9250
Declination (DEC) -56.4569
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+1252+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 1252 b
GJ 1252 b

  • GJ 1252 b is an exoplanet orbiting the star GJ 1252, located about 66.5 light-years (20.4 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star GJ 1252 has apparent magnitude of 12.0, with absolute magnitude of 10.5.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3458 with its spectral types of M4
  • In this planetary system, the extrasolar planet GJ 1252 b orbits around the star GJ 1252 every 0.5 days with its orbital distance of 0.01 AU ( 1370316.5 km)
  • (Projected orbit of GJ 1252 b around its host star GJ 1252)


  • The Star GJ 1252 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.101 AU ( 15152519.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.140 AU ( 20944741.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.213 AU ( 31915151.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.314 AU ( 46964543.0 km)
  • Radiation at Planetary Boundary of GJ 1252 b : 319497.40 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 1252)



  • Kopparapu Recent Venus for Star GJ 1252 distance : 0.115 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 1252 distance : 0.145 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 1252 distance : 0.140 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 1252 distance : 0.154 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 1252 distance : 0.283 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 1252 distance : 0.298 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 1252)



  • Original Kopparapu Recent Venus for Star GJ 1252 distance : 0.114 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 1252 distance : 0.150 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 1252 distance : 0.150 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 1252 distance : 0.287 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 1252 distance : 0.298 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 1252)



    (Position in Stellar Map of star GJ 1252 and its Exoplanet GJ 1252 b)



    (Zoomed position in Stellar Map of star GJ 1252 and its Exoplanet GJ 1252 b (zoom level 3))

    (Synthetic Spectrum of star GJ 1252*)
    *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