Imaginary Picture of eta2 Hyi b

Display orbital revolution of eta2 Hyi b around the hoststar eta2 Hyi
/
Exoplanet Name : eta2 Hyi b
Alternate Name : HD 11977 b
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 6.2900 (Mjup) 1999.8300 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.8900 (AU) 1.8900 (AU Est.)
Eccentricity : 0.4000
Orbital Period(Yrs) 1.9466
Orbital Period(Observed/Estimated) 711.00 (Days Obs.) 686.70 (Days Est.)
Surface Gravity (G Earth) 19.3130
Star Radiation at Atmospheric Boundary: 35541.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 612.8 (K)
Blackbody T 0.3(K) 575.5 (K)
Blackbody T 0.7(K) 465.6 (K)
Tidally Locked Blackbody T 0.1(K) 728.8 (K)
Tidally Locked Blackbody T 0.3(K) 684.4 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : eta2 Hyi
Alternate Name : HD 11977
Star Distance(LY) : 216.9
Stellar Radius(Rsun) : 13.0 (Rsun Measured)
Stellar Mass(Msun) : 1.9 (Msun Measured) 1.8 (Msun Estimated)
Star Age : 1.2 (GY)
Temperature : 4975 (K)
Spectral type : G8.5 III
UV portion[%]: 3.1
Visible portion[%]: 36.8
IR portion[%]: 60.1
Metalicity : -0.2
Absolute Magnitude: 0.6
Apparent Magnitude: 4.7
Right Ascension(RA) 28.7333
Declination (DEC) -67.6472
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
eta2 Hyi b
eta2 Hyi b

  • eta2 Hyi b is an exoplanet orbiting the star eta2 Hyi, located about 216.9 light-years (66.5 pc) away from Solar System. Its discovery was publicly announced on 2005.
  • The host star eta2 Hyi has apparent magnitude of 4.7, with absolute magnitude of 0.6.
  • It is 1.9 times more massive and 13.0 times bigger compared with our Sun. The surface temperature is 4975 with its spectral types of G8.5 III
  • In this planetary system, the extrasolar planet eta2 Hyi b orbits around the star eta2 Hyi every 711.0 days with its orbital distance of 1.89 AU ( 282739975.6 km)
  • (Projected orbit of eta2 Hyi b around its host star eta2 Hyi)


  • The Star eta2 Hyi 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 6.970 AU ( 1042767855.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 9.635 AU ( 1441377683.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 14.682 AU ( 2196340613.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 21.605 AU ( 3232011428.5 km)
  • Radiation at Planetary Boundary of eta2 Hyi b : 35541.87 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star eta2 Hyi)



  • Kopparapu Recent Venus for Star eta2 Hyi distance : 7.549 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star eta2 Hyi distance : 9.558 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star eta2 Hyi distance : 9.232 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star eta2 Hyi distance : 10.132 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star eta2 Hyi distance : 17.342 AU
  • Kopparapu Outer Boundary for Early Mars for Star eta2 Hyi distance : 18.292 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star eta2 Hyi)



  • Original Kopparapu Recent Venus for Star eta2 Hyi distance : 7.468 AU
  • Original Kopparapu Runaway Greenhouse for Star eta2 Hyi distance : 9.851 AU
  • Original Kopparapu Moist Greenhouse for Star eta2 Hyi distance : 9.882 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star eta2 Hyi distance : 17.632 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star eta2 Hyi distance : 18.337 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star eta2 Hyi)



    (Position in Stellar Map of star eta2 Hyi and its Exoplanet eta2 Hyi b)



    (Zoomed position in Stellar Map of star eta2 Hyi and its Exoplanet eta2 Hyi b (zoom level 3))

    (Synthetic Spectrum of star eta2 Hyi*)
    *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