Imaginary Picture of KMT-2021-BLG-1253 b

Display orbital revolution of KMT-2021-BLG-1253 b around the hoststar KMT-2021-BLG-1253
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Exoplanet Name : KMT-2021-BLG-1253 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.2280 (Rjup) 2.5556 (Rearth)
Mass (Mjup / Me): 0.0599 (Mjup) 19.0572 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.5200 (AU) 1.5200 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 1397.17 (Days Est.)
Surface Gravity (G Earth) 2.9180
Star Radiation at Atmospheric Boundary: 4.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 64.8 (K)
Blackbody T 0.3(K) 60.8 (K)
Blackbody T 0.7(K) 49.2 (K)
Tidally Locked Blackbody T 0.1(K) 77.0 (K)
Tidally Locked Blackbody T 0.3(K) 72.3 (K)
Size Class: sub-Neptune-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-1253
Alternate Name :
Star Distance(LY) : 21686.1
Stellar Radius(Rsun) : 0.3 (Rsun Estimated)
Stellar Mass(Msun) : 0.2 (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) 267.6167
Declination (DEC) -29.2792
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-1253 b
KMT-2021-BLG-1253 b

  • KMT-2021-BLG-1253 b is an exoplanet orbiting the star KMT-2021-BLG-1253, located about 21686.1 light-years (6649.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star KMT-2021-BLG-1253 has apparent magnitude of 22.0, with absolute magnitude of 7.9.
  • It is 0.2 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • (Projected orbit of KMT-2021-BLG-1253 b around its host star KMT-2021-BLG-1253)


  • The Star KMT-2021-BLG-1253 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.063 AU ( 9366274.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.087 AU ( 12946638.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.132 AU ( 19727812.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.194 AU ( 29030340.5 km)
  • Radiation at Planetary Boundary of KMT-2021-BLG-1253 b : 4.43 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KMT-2021-BLG-1253)



  • Kopparapu Recent Venus for Star KMT-2021-BLG-1253 distance : 0.071 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star KMT-2021-BLG-1253 distance : 0.090 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star KMT-2021-BLG-1253 distance : 0.087 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star KMT-2021-BLG-1253 distance : 0.095 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star KMT-2021-BLG-1253 distance : 0.176 AU
  • Kopparapu Outer Boundary for Early Mars for Star KMT-2021-BLG-1253 distance : 0.186 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star KMT-2021-BLG-1253)



  • Original Kopparapu Recent Venus for Star KMT-2021-BLG-1253 distance : 0.070 AU
  • Original Kopparapu Runaway Greenhouse for Star KMT-2021-BLG-1253 distance : 0.093 AU
  • Original Kopparapu Moist Greenhouse for Star KMT-2021-BLG-1253 distance : 0.093 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KMT-2021-BLG-1253 distance : 0.179 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star KMT-2021-BLG-1253 distance : 0.186 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star KMT-2021-BLG-1253)



    (Position in Stellar Map of star KMT-2021-BLG-1253 and its Exoplanet KMT-2021-BLG-1253 b)



    (Zoomed position in Stellar Map of star KMT-2021-BLG-1253 and its Exoplanet KMT-2021-BLG-1253 b (zoom level 3))

    (Synthetic Spectrum of star KMT-2021-BLG-1253*)
    *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