Imaginary Picture of HD 142 Ab

Display orbital revolution of HD 142 Ab around the hoststar HD 142 A
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Exoplanet Name : HD 142 Ab
Alternate Name : HD 142 b
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.2500 (Mjup) 397.4225 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.0200 (AU) 1.0200 (AU Est.)
Eccentricity : 0.1700
Orbital Period(Yrs) 0.9574
Orbital Period(Observed/Estimated) 349.70 (Days Obs.) 358.75 (Days Est.)
Surface Gravity (G Earth) 3.8380
Star Radiation at Atmospheric Boundary: 1271.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 266.5 (K)
Blackbody T 0.3(K) 250.3 (K)
Blackbody T 0.7(K) 202.5 (K)
Tidally Locked Blackbody T 0.1(K) 316.9 (K)
Tidally Locked Blackbody T 0.3(K) 297.6 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 142 A
Alternate Name : HD 142
Star Distance(LY) : 67.2
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 5.9 (GY)
Temperature : 6180 (K)
Spectral type : G1 IV
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : 0.0
Absolute Magnitude: 4.1
Apparent Magnitude: 5.7
Right Ascension(RA) 1.5792
Declination (DEC) -49.0750
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
HD 142 Ab
HD 142 Ab

  • HD 142 Ab is an exoplanet orbiting the star HD 142 A, located about 67.2 light-years (20.6 pc) away from Solar System. Its discovery was publicly announced on 2001.
  • The host star HD 142 A has apparent magnitude of 5.7, with absolute magnitude of 4.1.
  • It is 1.1 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 6180 with its spectral types of G1 IV
  • In this planetary system, the extrasolar planet HD 142 Ab orbits around the star HD 142 A every 349.7 days with its orbital distance of 1.02 AU ( 152589828.1 km)
  • (Projected orbit of HD 142 Ab around its host star HD 142 A)


  • The Star HD 142 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.712 AU ( 106447021.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.984 AU ( 147137601.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.499 AU ( 224205143.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.205 AU ( 329927690.3 km)
  • Radiation at Planetary Boundary of HD 142 Ab : 1271.61 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 142 A)



  • Kopparapu Recent Venus for Star HD 142 A distance : 0.720 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 142 A distance : 0.911 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 142 A distance : 0.880 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 142 A distance : 0.965 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 142 A distance : 1.594 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 142 A distance : 1.682 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 142 A)



  • Original Kopparapu Recent Venus for Star HD 142 A distance : 0.727 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 142 A distance : 0.935 AU
  • Original Kopparapu Moist Greenhouse for Star HD 142 A distance : 0.962 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 142 A distance : 1.623 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 142 A distance : 1.688 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 142 A)



    (Position in Stellar Map of star HD 142 A and its Exoplanet HD 142 Ab)



    (Zoomed position in Stellar Map of star HD 142 A and its Exoplanet HD 142 Ab (zoom level 3))

    (Synthetic Spectrum of star HD 142 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