Imaginary Picture of BLG-1691L b

Display orbital revolution of BLG-1691L b around the hoststar OGLE-2017-BLG-1691L
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Exoplanet Name : BLG-1691L b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.2145 (Rjup) 2.4046 (Rearth)
Mass (Mjup / Me): 0.0460 (Mjup) 14.6251 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.4600 (AU) 2.4600 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 2100.81 (Days Est.)
Surface Gravity (G Earth) 2.5293
Star Radiation at Atmospheric Boundary: 4.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 65.0 (K)
Blackbody T 0.3(K) 61.1 (K)
Blackbody T 0.7(K) 49.4 (K)
Tidally Locked Blackbody T 0.1(K) 77.3 (K)
Tidally Locked Blackbody T 0.3(K) 72.6 (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 : OGLE-2017-BLG-1691L
Alternate Name : KMT-2017-BLG-0752
Star Distance(LY) : 23776.8
Stellar Radius(Rsun) : 0.4 (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: 7.7
Apparent Magnitude: 22.0
Right Ascension(RA) 263.5958
Declination (DEC) -29.2847
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
BLG-1691L b
BLG-1691L b

  • BLG-1691L b is an exoplanet orbiting the star OGLE-2017-BLG-1691L, located about 23776.8 light-years (7290.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star OGLE-2017-BLG-1691L has apparent magnitude of 22.0, with absolute magnitude of 7.7.
  • It is 0.5 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 BLG-1691L b around its host star OGLE-2017-BLG-1691L)


  • The Star OGLE-2017-BLG-1691L 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.102 AU ( 15287405.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.141 AU ( 21131190.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.215 AU ( 32199257.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.317 AU ( 47382617.7 km)
  • Radiation at Planetary Boundary of BLG-1691L b : 4.51 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star OGLE-2017-BLG-1691L)



  • Kopparapu Recent Venus for Star OGLE-2017-BLG-1691L distance : 0.116 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star OGLE-2017-BLG-1691L distance : 0.146 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star OGLE-2017-BLG-1691L distance : 0.141 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star OGLE-2017-BLG-1691L distance : 0.156 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star OGLE-2017-BLG-1691L distance : 0.288 AU
  • Kopparapu Outer Boundary for Early Mars for Star OGLE-2017-BLG-1691L distance : 0.304 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star OGLE-2017-BLG-1691L)



  • Original Kopparapu Recent Venus for Star OGLE-2017-BLG-1691L distance : 0.115 AU
  • Original Kopparapu Runaway Greenhouse for Star OGLE-2017-BLG-1691L distance : 0.152 AU
  • Original Kopparapu Moist Greenhouse for Star OGLE-2017-BLG-1691L distance : 0.152 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star OGLE-2017-BLG-1691L distance : 0.292 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star OGLE-2017-BLG-1691L distance : 0.304 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star OGLE-2017-BLG-1691L)



    (Position in Stellar Map of star OGLE-2017-BLG-1691L and its Exoplanet BLG-1691L b)



    (Zoomed position in Stellar Map of star OGLE-2017-BLG-1691L and its Exoplanet BLG-1691L b (zoom level 3))

    (Synthetic Spectrum of star OGLE-2017-BLG-1691L*)
    *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