Imaginary Picture of KMT-2023-BLG-1866L b

Display orbital revolution of KMT-2023-BLG-1866L b around the hoststar KMT-2023-BLG-1866L
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Exoplanet Name : KMT-2023-BLG-1866L b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1226 (Rjup) 1.3745 (Rearth)
Mass (Mjup / Me): 0.0104 (Mjup) 3.3066 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.5500 (AU) 2.5500 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 2103.37 (Days Est.)
Surface Gravity (G Earth) 1.7502
Star Radiation at Atmospheric Boundary: 4.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 66.3 (K)
Blackbody T 0.3(K) 62.3 (K)
Blackbody T 0.7(K) 50.4 (K)
Tidally Locked Blackbody T 0.1(K) 78.9 (K)
Tidally Locked Blackbody T 0.3(K) 74.1 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Microlensing
Mass Detection : Microlensing
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : KMT-2023-BLG-1866L
Alternate Name :
Star Distance(LY) : 20678.3
Stellar Radius(Rsun) : 0.5 (Rsun Estimated)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3300 (K)
Spectral type : M9
UV portion[%]: 0.2
Visible portion[%]: 11.2
IR portion[%]: 88.6
Metalicity : 0.0
Absolute Magnitude: 8.0
Apparent Magnitude: 22.0
Right Ascension(RA) 273.4823
Declination (DEC) -28.4474
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
KMT-2023-BLG-1866L b
KMT-2023-BLG-1866L b

  • KMT-2023-BLG-1866L b is an exoplanet orbiting the star KMT-2023-BLG-1866L, located about 20678.3 light-years (6340.0 pc) away from Solar System. Its discovery was publicly announced on 2024.
  • The host star KMT-2023-BLG-1866L has apparent magnitude of 22.0, with absolute magnitude of 8.0.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • (Projected orbit of KMT-2023-BLG-1866L b around its host star KMT-2023-BLG-1866L)


  • The Star KMT-2023-BLG-1866L 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.110 AU ( 16479375.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.152 AU ( 22778803.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.232 AU ( 34709855.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.341 AU ( 51077072.1 km)
  • Radiation at Planetary Boundary of KMT-2023-BLG-1866L b : 4.88 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KMT-2023-BLG-1866L)



  • Kopparapu Recent Venus for Star KMT-2023-BLG-1866L distance : 0.125 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star KMT-2023-BLG-1866L distance : 0.158 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star KMT-2023-BLG-1866L distance : 0.152 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star KMT-2023-BLG-1866L distance : 0.168 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star KMT-2023-BLG-1866L distance : 0.310 AU
  • Kopparapu Outer Boundary for Early Mars for Star KMT-2023-BLG-1866L distance : 0.327 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star KMT-2023-BLG-1866L)



  • Original Kopparapu Recent Venus for Star KMT-2023-BLG-1866L distance : 0.124 AU
  • Original Kopparapu Runaway Greenhouse for Star KMT-2023-BLG-1866L distance : 0.164 AU
  • Original Kopparapu Moist Greenhouse for Star KMT-2023-BLG-1866L distance : 0.164 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KMT-2023-BLG-1866L distance : 0.315 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star KMT-2023-BLG-1866L distance : 0.328 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star KMT-2023-BLG-1866L)



    (Position in Stellar Map of star KMT-2023-BLG-1866L and its Exoplanet KMT-2023-BLG-1866L b)



    (Zoomed position in Stellar Map of star KMT-2023-BLG-1866L and its Exoplanet KMT-2023-BLG-1866L b (zoom level 3))

    (Synthetic Spectrum of star KMT-2023-BLG-1866L*)
    *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