Imaginary Picture of HD 1397 b

Display orbital revolution of HD 1397 b around the hoststar HD 1397
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Exoplanet Name : HD 1397 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.0260 (Rjup) 11.5004 (Rearth)
Mass (Mjup / Me): 0.4150 (Mjup) 131.9443 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1097 (AU) 0.1097 (AU Est.)
Eccentricity : 0.2510
Orbital Period(Yrs) 0.0316
Orbital Period(Observed/Estimated) 11.54 (Days Obs.) 11.54 (Days Est.)
Surface Gravity (G Earth) 0.9976
Star Radiation at Atmospheric Boundary: 515738.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1196.1 (K)
Blackbody T 0.3(K) 1123.2 (K)
Blackbody T 0.7(K) 908.8 (K)
Tidally Locked Blackbody T 0.1(K) 1422.4 (K)
Tidally Locked Blackbody T 0.3(K) 1335.7 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 1397
Alternate Name :
Star Distance(LY) : 260.1
Stellar Radius(Rsun) : 2.3 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 4.5 (GY)
Temperature : 5528 (K)
Spectral type : G5III
UV portion[%]: 7.0
Visible portion[%]: 43.4
IR portion[%]: 49.6
Metalicity : 0.3
Absolute Magnitude: 3.4
Apparent Magnitude: 7.9
Right Ascension(RA) 4.4465
Declination (DEC) -66.3589
Hubble Space Telescope Guide Star Catalog (GSC) ID 08846-00638
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=HD+1397+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 1397 b
HD 1397 b

  • HD 1397 b is an exoplanet orbiting the star HD 1397, located about 260.1 light-years (79.8 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star HD 1397 has apparent magnitude of 7.9, with absolute magnitude of 3.4.
  • It is 1.3 times more massive and 2.3 times bigger compared with our Sun. The surface temperature is 5528 with its spectral types of G5III
  • In this planetary system, the extrasolar planet HD 1397 b orbits around the star HD 1397 every 11.5 days with its orbital distance of 0.11 AU ( 16410886.4 km)
  • (Projected orbit of HD 1397 b around its host star HD 1397)


  • The Star HD 1397 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.541 AU ( 230556386.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.130 AU ( 318689178.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.246 AU ( 485611781.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.777 AU ( 714599009.7 km)
  • Radiation at Planetary Boundary of HD 1397 b : 515738.61 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 1397)



  • Kopparapu Recent Venus for Star HD 1397 distance : 1.621 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 1397 distance : 2.053 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 1397 distance : 1.983 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 1397 distance : 2.174 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 1397 distance : 3.651 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 1397 distance : 3.851 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 1397)



  • Original Kopparapu Recent Venus for Star HD 1397 distance : 1.616 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 1397 distance : 2.111 AU
  • Original Kopparapu Moist Greenhouse for Star HD 1397 distance : 2.138 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 1397 distance : 3.715 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 1397 distance : 3.863 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 1397)



    (Position in Stellar Map of star HD 1397 and its Exoplanet HD 1397 b)



    (Zoomed position in Stellar Map of star HD 1397 and its Exoplanet HD 1397 b (zoom level 3))

    (Synthetic Spectrum of star HD 1397*)
    *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