Imaginary Picture of GJ 2030 b

Display orbital revolution of GJ 2030 b around the hoststar GJ 2030
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Exoplanet Name : GJ 2030 b
Alternate Name : HD 21019 b
Status : Confirmed
Radius (Rjup / Re): 0.1324 (Rjup) 1.4837 (Rearth)
Mass (Mjup / Me): 0.0140 (Mjup) 4.4511 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0340 (AU) 0.0340 (AU Est.)
Eccentricity : 0.2460
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 2.29 (Days Est.)
Surface Gravity (G Earth) 2.0221
Star Radiation at Atmospheric Boundary: 1088711.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1441.7 (K)
Blackbody T 0.3(K) 1353.9 (K)
Blackbody T 0.7(K) 1095.4 (K)
Tidally Locked Blackbody T 0.1(K) 1714.5 (K)
Tidally Locked Blackbody T 0.3(K) 1610.1 (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 2030
Alternate Name : HD 21019
Star Distance(LY) : 122.4
Stellar Radius(Rsun) : 1.0 (Rsun Estimated)
Stellar Mass(Msun) : 1.0 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5660 (K)
Spectral type : G5/6V
UV portion[%]: 7.5
Visible portion[%]: 44.2
IR portion[%]: 48.3
Metalicity : 0.0
Absolute Magnitude: 3.3
Apparent Magnitude: 6.2
Right Ascension(RA) 50.8237
Declination (DEC) -7.7936
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+2030&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 2030 b
GJ 2030 b

  • GJ 2030 b is an exoplanet orbiting the star GJ 2030, located about 122.4 light-years (37.5 pc) away from Solar System.
  • The host star GJ 2030 has apparent magnitude of 6.2, with absolute magnitude of 3.3.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5660 with its spectral types of G5/6V
  • (Projected orbit of GJ 2030 b around its host star GJ 2030)


  • The Star GJ 2030 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.694 AU ( 103822378.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.959 AU ( 143509659.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.462 AU ( 218676962.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.151 AU ( 321792729.6 km)
  • Radiation at Planetary Boundary of GJ 2030 b : 1088711.23 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 2030)



  • Kopparapu Recent Venus for Star GJ 2030 distance : 0.724 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 2030 distance : 0.917 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 2030 distance : 0.886 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 2030 distance : 0.971 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 2030 distance : 1.625 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 2030 distance : 1.714 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 2030)



  • Original Kopparapu Recent Venus for Star GJ 2030 distance : 0.724 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 2030 distance : 0.943 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 2030 distance : 0.958 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 2030 distance : 1.654 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 2030 distance : 1.720 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 2030)



    (Position in Stellar Map of star GJ 2030 and its Exoplanet GJ 2030 b)



    (Zoomed position in Stellar Map of star GJ 2030 and its Exoplanet GJ 2030 b (zoom level 3))

    (Synthetic Spectrum of star GJ 2030*)
    *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