Imaginary Picture of ISO 2I_Borisov

Display orbital revolution of ISO 2I_Borisov around the hoststar Sun
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Exoplanet Name : ISO 2I_Borisov
Alternate Name : C_2019 Q4 (Borisov)
Status : Confirmed
Radius (Rjup / Re): 0.0000 (Rjup) 0.0000 (Rearth)
Mass (Mjup / Me): 0.0000 (Mjup) 0.0000 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0000 (AU Est.)
Eccentricity : 3.1550
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) nan
Star Radiation at Atmospheric Boundary: 0.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 0.0 (K)
Blackbody T 0.3(K) 0.0 (K)
Blackbody T 0.7(K) 0.0 (K)
Tidally Locked Blackbody T 0.1(K) 0.0 (K)
Tidally Locked Blackbody T 0.3(K) 0.0 (K)
Size Class: Asteroid-size
Mass Class:
Detection Type : Imaging
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Sun
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3300 (K)
Spectral type : M9
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 25.0
Apparent Magnitude: 22.0
Right Ascension(RA) 0.0000
Declination (DEC) 0.0000
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
ISO 2I_Borisov
ISO 2I_Borisov

  • ISO 2I_Borisov is an exoplanet orbiting the star Sun. Its discovery was publicly announced on 2019.
  • The host star Sun has apparent magnitude of 22.0, with absolute magnitude of 25.0.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • (Projected orbit of ISO 2I_Borisov around its host star Sun)


  • The Star Sun 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.236 AU ( 35292790.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.326 AU ( 48783858.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.497 AU ( 74335805.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.731 AU ( 109388393.7 km)
  • Radiation at Planetary Boundary of ISO 2I_Borisov : 0.00 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Sun)



  • Kopparapu Recent Venus for Star Sun distance : 0.267 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Sun distance : 0.338 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Sun distance : 0.326 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Sun distance : 0.359 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Sun distance : 0.664 AU
  • Kopparapu Outer Boundary for Early Mars for Star Sun distance : 0.701 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Sun)



  • Original Kopparapu Recent Venus for Star Sun distance : 0.265 AU
  • Original Kopparapu Runaway Greenhouse for Star Sun distance : 0.350 AU
  • Original Kopparapu Moist Greenhouse for Star Sun distance : 0.351 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Sun distance : 0.675 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Sun distance : 0.702 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Sun)



    (Position in Stellar Map of star Sun and its Exoplanet ISO 2I_Borisov)



    (Zoomed position in Stellar Map of star Sun and its Exoplanet ISO 2I_Borisov (zoom level 3))

    (Synthetic Spectrum of star Sun*)
    *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