Imaginary Picture of K2-403 b

Display orbital revolution of K2-403 b around the hoststar K2-403
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Exoplanet Name : K2-403 b
Alternate Name : "TOI-6877 b, TOI-6877.01"
Status : Confirmed
Radius (Rjup / Re): 0.4758 (Rjup) 5.3330 (Rearth)
Mass (Mjup / Me): 0.0784 (Mjup) 24.9200 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1879 (AU) 0.1879 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0920
Orbital Period(Observed/Estimated) 33.59 (Days Obs.) 33.60 (Days Est.)
Surface Gravity (G Earth) 0.8762
Star Radiation at Atmospheric Boundary: 25150.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 562.1 (K)
Blackbody T 0.3(K) 527.8 (K)
Blackbody T 0.7(K) 427.1 (K)
Tidally Locked Blackbody T 0.1(K) 668.4 (K)
Tidally Locked Blackbody T 0.3(K) 627.7 (K)
Size Class: sub-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-403
Alternate Name : "EPIC 248758353, TOI-6877"
Star Distance(LY) : 804.3
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5511 (K)
Spectral type : G5V
UV portion[%]: 6.9
Visible portion[%]: 43.3
IR portion[%]: 49.8
Metalicity : 5511.0
Absolute Magnitude: 5.4
Apparent Magnitude: 12.4
Right Ascension(RA) 164.1895
Declination (DEC) 9.6740
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
K2-403 b
K2-403 b

  • K2-403 b is an exoplanet orbiting the star K2-403, located about 804.3 light-years (246.6 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star K2-403 has apparent magnitude of 12.4, with absolute magnitude of 5.4.
  • It is 0.8 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5511 with its spectral types of G5V
  • In this planetary system, the extrasolar planet K2-403 b orbits around the star K2-403 every 33.6 days with its orbital distance of 0.19 AU ( 28109439.9 km)
  • (Projected orbit of K2-403 b around its host star K2-403)


  • The Star K2-403 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.583 AU ( 87207263.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.806 AU ( 120543227.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.228 AU ( 183681202.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.807 AU ( 270294936.0 km)
  • Radiation at Planetary Boundary of K2-403 b : 25150.14 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-403)



  • Kopparapu Recent Venus for Star K2-403 distance : 0.614 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-403 distance : 0.777 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-403 distance : 0.751 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-403 distance : 0.823 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-403 distance : 1.383 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-403 distance : 1.459 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-403)



  • Original Kopparapu Recent Venus for Star K2-403 distance : 0.612 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-403 distance : 0.799 AU
  • Original Kopparapu Moist Greenhouse for Star K2-403 distance : 0.809 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-403 distance : 1.407 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-403 distance : 1.463 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-403)



    (Position in Stellar Map of star K2-403 and its Exoplanet K2-403 b)



    (Zoomed position in Stellar Map of star K2-403 and its Exoplanet K2-403 b (zoom level 3))

    (Synthetic Spectrum of star K2-403*)
    *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