Imaginary Picture of KMT-2021-BLG-0909 b

Display orbital revolution of KMT-2021-BLG-0909 b around the hoststar KMT-2021-BLG-0909
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Exoplanet Name : KMT-2021-BLG-0909 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.2600 (Mjup) 400.6019 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.7500 (AU) 1.7500 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 1371.69 (Days Est.)
Surface Gravity (G Earth) 3.8687
Star Radiation at Atmospheric Boundary: 7.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 72.5 (K)
Blackbody T 0.3(K) 68.1 (K)
Blackbody T 0.7(K) 55.1 (K)
Tidally Locked Blackbody T 0.1(K) 86.3 (K)
Tidally Locked Blackbody T 0.3(K) 81.0 (K)
Size Class: Jupiter-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-2021-BLG-0909
Alternate Name :
Star Distance(LY) : 21134.9
Stellar Radius(Rsun) : 0.4 (Rsun Estimated)
Stellar Mass(Msun) : 0.4 (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: 7.9
Apparent Magnitude: 22.0
Right Ascension(RA) 265.6208
Declination (DEC) -27.6392
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-2021-BLG-0909 b
KMT-2021-BLG-0909 b

  • KMT-2021-BLG-0909 b is an exoplanet orbiting the star KMT-2021-BLG-0909, located about 21134.9 light-years (6480.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star KMT-2021-BLG-0909 has apparent magnitude of 22.0, with absolute magnitude of 7.9.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • (Projected orbit of KMT-2021-BLG-0909 b around its host star KMT-2021-BLG-0909)


  • The Star KMT-2021-BLG-0909 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.090 AU ( 13527577.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.125 AU ( 18698647.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.190 AU ( 28492601.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.280 AU ( 41928111.1 km)
  • Radiation at Planetary Boundary of KMT-2021-BLG-0909 b : 6.98 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KMT-2021-BLG-0909)



  • Kopparapu Recent Venus for Star KMT-2021-BLG-0909 distance : 0.102 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star KMT-2021-BLG-0909 distance : 0.130 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star KMT-2021-BLG-0909 distance : 0.125 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star KMT-2021-BLG-0909 distance : 0.138 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star KMT-2021-BLG-0909 distance : 0.255 AU
  • Kopparapu Outer Boundary for Early Mars for Star KMT-2021-BLG-0909 distance : 0.269 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star KMT-2021-BLG-0909)



  • Original Kopparapu Recent Venus for Star KMT-2021-BLG-0909 distance : 0.102 AU
  • Original Kopparapu Runaway Greenhouse for Star KMT-2021-BLG-0909 distance : 0.134 AU
  • Original Kopparapu Moist Greenhouse for Star KMT-2021-BLG-0909 distance : 0.135 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KMT-2021-BLG-0909 distance : 0.259 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star KMT-2021-BLG-0909 distance : 0.269 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star KMT-2021-BLG-0909)



    (Position in Stellar Map of star KMT-2021-BLG-0909 and its Exoplanet KMT-2021-BLG-0909 b)



    (Zoomed position in Stellar Map of star KMT-2021-BLG-0909 and its Exoplanet KMT-2021-BLG-0909 b (zoom level 3))

    (Synthetic Spectrum of star KMT-2021-BLG-0909*)
    *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