Imaginary Picture of TOI-1685 b

Display orbital revolution of TOI-1685 b around the hoststar TOI-1685
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Exoplanet Name : TOI-1685 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1570 (Rjup) 1.7598 (Rearth)
Mass (Mjup / Me): 0.0099 (Mjup) 3.1412 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0120 (AU) 0.0120 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0018
Orbital Period(Observed/Estimated) 0.67 (Days Obs.) 0.68 (Days Est.)
Surface Gravity (G Earth) 1.0143
Star Radiation at Atmospheric Boundary: 286664.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1032.7 (K)
Blackbody T 0.3(K) 969.8 (K)
Blackbody T 0.7(K) 784.7 (K)
Tidally Locked Blackbody T 0.1(K) 1228.1 (K)
Tidally Locked Blackbody T 0.3(K) 1153.3 (K)
Size Class: super-Earth-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-1685
Alternate Name :
Star Distance(LY) : 122.7
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 1.3 (GY)
Temperature : 3434 (K)
Spectral type : M3.0V
UV portion[%]: 0.2
Visible portion[%]: 10.9
IR portion[%]: 88.8
Metalicity : -0.1
Absolute Magnitude: 19.1
Apparent Magnitude: 22.0
Right Ascension(RA) 68.5958
Declination (DEC) 43.0369
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TOI-1685&submit=SIMBAD+search
Open Exoplanet Database Link
TOI-1685 b
TOI-1685 b

  • TOI-1685 b is an exoplanet orbiting the star TOI-1685, located about 122.7 light-years (37.6 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star TOI-1685 has apparent magnitude of 22.0, with absolute magnitude of 19.1.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3434 with its spectral types of M3.0V
  • In this planetary system, the extrasolar planet TOI-1685 b orbits around the star TOI-1685 every 0.7 days with its orbital distance of 0.01 AU ( 1795174.4 km)
  • (Projected orbit of TOI-1685 b around its host star TOI-1685)


  • The Star TOI-1685 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.126 AU ( 18802855.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.174 AU ( 25990459.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.265 AU ( 39603708.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.390 AU ( 58278591.9 km)
  • Radiation at Planetary Boundary of TOI-1685 b : 286664.35 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-1685)



  • Kopparapu Recent Venus for Star TOI-1685 distance : 0.142 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-1685 distance : 0.180 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-1685 distance : 0.174 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-1685 distance : 0.191 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1685 distance : 0.351 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-1685 distance : 0.370 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-1685)



  • Original Kopparapu Recent Venus for Star TOI-1685 distance : 0.141 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-1685 distance : 0.186 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-1685 distance : 0.187 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1685 distance : 0.357 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-1685 distance : 0.371 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-1685)



    (Position in Stellar Map of star TOI-1685 and its Exoplanet TOI-1685 b)



    (Zoomed position in Stellar Map of star TOI-1685 and its Exoplanet TOI-1685 b (zoom level 3))

    (Synthetic Spectrum of star TOI-1685*)
    *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