Imaginary Picture of USco 1621A b

Display orbital revolution of USco 1621A b around the hoststar USco 1621 A
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Exoplanet Name : USco 1621A b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 15.0000 (Mjup) 4769.0700 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2880.0000 (AU) 2880.0000 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 94086585.08 (Days Est.)
Surface Gravity (G Earth) 46.0565
Star Radiation at Atmospheric Boundary: 0.0 (W/m2)
Measured Temperature (K) 2270.0 (K)
Blackbody T 0.1(K) 1.8 (K)
Blackbody T 0.3(K) 1.7 (K)
Blackbody T 0.7(K) 1.4 (K)
Tidally Locked Blackbody T 0.1(K) 2.2 (K)
Tidally Locked Blackbody T 0.3(K) 2.0 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Imaging
Mass Detection : Spectrum
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : USco 1621 A
Alternate Name :
Star Distance(LY) : 450.1
Stellar Radius(Rsun) : 0.4 (Rsun Estimated)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3460 (K)
Spectral type : M2.5
UV portion[%]: 0.3
Visible portion[%]: 13.4
IR portion[%]: 86.3
Metalicity : 0.0
Absolute Magnitude: 9.3
Apparent Magnitude: 15.0
Right Ascension(RA) 245.3750
Declination (DEC) -25.4953
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
USco 1621A b
USco 1621A b

  • USco 1621A b is an exoplanet orbiting the star USco 1621 A, located about 450.1 light-years (138.0 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star USco 1621 A has apparent magnitude of 15.0, with absolute magnitude of 9.3.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3460 with its spectral types of M2.5
  • (Projected orbit of USco 1621A b around its host star USco 1621 A)


  • The Star USco 1621 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.095 AU ( 14236419.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.132 AU ( 19678451.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.200 AU ( 29985605.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.295 AU ( 44125132.0 km)
  • Radiation at Planetary Boundary of USco 1621A b : 0.00 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star USco 1621 A)



  • Kopparapu Recent Venus for Star USco 1621 A distance : 0.108 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star USco 1621 A distance : 0.136 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star USco 1621 A distance : 0.131 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star USco 1621 A distance : 0.145 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star USco 1621 A distance : 0.265 AU
  • Kopparapu Outer Boundary for Early Mars for Star USco 1621 A distance : 0.280 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star USco 1621 A)



  • Original Kopparapu Recent Venus for Star USco 1621 A distance : 0.107 AU
  • Original Kopparapu Runaway Greenhouse for Star USco 1621 A distance : 0.141 AU
  • Original Kopparapu Moist Greenhouse for Star USco 1621 A distance : 0.141 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star USco 1621 A distance : 0.270 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star USco 1621 A distance : 0.280 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star USco 1621 A)



    (Position in Stellar Map of star USco 1621 A and its Exoplanet USco 1621A b)



    (Zoomed position in Stellar Map of star USco 1621 A and its Exoplanet USco 1621A b (zoom level 3))

    (Synthetic Spectrum of star USco 1621 A*)
    *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