Imaginary Picture of TOI-402 c

Display orbital revolution of TOI-402 c around the hoststar TOI-402
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Exoplanet Name : TOI-402 c
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.2254 (Rjup) 2.5261 (Rearth)
Mass (Mjup / Me): 0.0214 (Mjup) 6.7912 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1235 (AU) 0.1235 (AU Est.)
Eccentricity : 0.0960
Orbital Period(Yrs) 0.0470
Orbital Period(Observed/Estimated) 17.18 (Days Obs.) 17.18 (Days Est.)
Surface Gravity (G Earth) 1.0643
Star Radiation at Atmospheric Boundary: 39228.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 628.1 (K)
Blackbody T 0.3(K) 589.9 (K)
Blackbody T 0.7(K) 477.3 (K)
Tidally Locked Blackbody T 0.1(K) 747.0 (K)
Tidally Locked Blackbody T 0.3(K) 701.5 (K)
Size Class: sub-Neptune-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 : TOI-402
Alternate Name : HD 15337
Star Distance(LY) : 146.3
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 7.5 (GY)
Temperature : 5131 (K)
Spectral type : K1
UV portion[%]: 4.2
Visible portion[%]: 39.0
IR portion[%]: 56.8
Metalicity : 0.0
Absolute Magnitude: 5.8
Apparent Magnitude: 9.1
Right Ascension(RA) 36.8682
Declination (DEC) -27.6352
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
TOI-402 c
TOI-402 c

  • TOI-402 c is an exoplanet orbiting the star TOI-402, located about 146.3 light-years (44.9 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star TOI-402 has apparent magnitude of 9.1, with absolute magnitude of 5.8.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5131 with its spectral types of K1
  • In this planetary system, the extrasolar planet TOI-402 c orbits around the star TOI-402 every 17.2 days with its orbital distance of 0.12 AU ( 18475337.0 km)
  • (Projected orbit of TOI-402 c around its host star TOI-402)


  • The Star TOI-402 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.479 AU ( 71585341.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.661 AU ( 98949649.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.008 AU ( 150777368.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.483 AU ( 221875503.3 km)
  • Radiation at Planetary Boundary of TOI-402 c : 39228.61 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-402)



  • Kopparapu Recent Venus for Star TOI-402 distance : 0.514 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-402 distance : 0.651 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-402 distance : 0.629 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-402 distance : 0.690 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-402 distance : 1.174 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-402 distance : 1.239 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-402)



  • Original Kopparapu Recent Venus for Star TOI-402 distance : 0.510 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-402 distance : 0.671 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-402 distance : 0.674 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-402 distance : 1.194 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-402 distance : 1.242 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-402)



    (Position in Stellar Map of star TOI-402 and its Exoplanet TOI-402 c)



    (Zoomed position in Stellar Map of star TOI-402 and its Exoplanet TOI-402 c (zoom level 3))

    (Synthetic Spectrum of star TOI-402*)
    *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