Imaginary Picture of HT Lup (AB)b

Display orbital revolution of HT Lup (AB)b around the hoststar HT Lup
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Exoplanet Name : HT Lup (AB)b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 30.8000 (Mjup) 9792.4904 (Mearth)
Semi Major Axis / Orbital Distance Calculated 7570.0000 (AU) 7570.0000 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 515523.1890
Orbital Period(Observed/Estimated) 188300000.00 (Days Obs.) 190184032.92 (Days Est.)
Surface Gravity (G Earth) 94.5693
Star Radiation at Atmospheric Boundary: 0.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 4.6 (K)
Blackbody T 0.3(K) 4.3 (K)
Blackbody T 0.7(K) 3.5 (K)
Tidally Locked Blackbody T 0.1(K) 5.4 (K)
Tidally Locked Blackbody T 0.3(K) 5.1 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : "Imaging, Astrometry"
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HT Lup
Alternate Name : "CD-33 10685, 2MASS J15451286-3417305, GHE 30, KOH 48 A"
Star Distance(LY) : 500.8
Stellar Radius(Rsun) : 3.5 (Rsun Measured)
Stellar Mass(Msun) : 1.6 (Msun Measured) 1.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4506 (K)
Spectral type : K3Ve
UV portion[%]: 1.6
Visible portion[%]: 31.2
IR portion[%]: 67.2
Metalicity : 0.0
Absolute Magnitude: 4.3
Apparent Magnitude: 10.2
Right Ascension(RA) 236.3036
Declination (DEC) -34.2918
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
HT Lup (AB)b
HT Lup (AB)b

  • HT Lup (AB)b is an exoplanet orbiting the star HT Lup, located about 500.8 light-years (153.5 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star HT Lup has apparent magnitude of 10.2, with absolute magnitude of 4.3.
  • It is 1.6 times more massive and 3.5 times bigger compared with our Sun. The surface temperature is 4506 with its spectral types of K3Ve
  • In this planetary system, the extrasolar planet HT Lup (AB)b orbits around the star HT Lup every 188300000.0 days with its orbital distance of 7570.00 AU ( 1132455881199.0 km)
  • (Projected orbit of HT Lup (AB)b around its host star HT Lup)


  • The Star HT Lup 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.557 AU ( 232939827.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.152 AU ( 321983715.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.280 AU ( 490631928.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.826 AU ( 721986375.5 km)
  • Radiation at Planetary Boundary of HT Lup (AB)b : 0.00 W/m2

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



  • Kopparapu Recent Venus for Star HT Lup distance : 1.719 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HT Lup distance : 2.177 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HT Lup distance : 2.102 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HT Lup distance : 2.309 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HT Lup distance : 4.031 AU
  • Kopparapu Outer Boundary for Early Mars for Star HT Lup distance : 4.252 AU

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



  • Original Kopparapu Recent Venus for Star HT Lup distance : 1.697 AU
  • Original Kopparapu Runaway Greenhouse for Star HT Lup distance : 2.247 AU
  • Original Kopparapu Moist Greenhouse for Star HT Lup distance : 2.245 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HT Lup distance : 4.096 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HT Lup distance : 4.260 AU

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



    (Position in Stellar Map of star HT Lup and its Exoplanet HT Lup (AB)b)



    (Zoomed position in Stellar Map of star HT Lup and its Exoplanet HT Lup (AB)b (zoom level 3))

    (Synthetic Spectrum of star HT Lup*)
    *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