Imaginary Picture of HIP 99770 b

Display orbital revolution of HIP 99770 b around the hoststar HIP 99770
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Exoplanet Name : HIP 99770 b
Alternate Name : 29 Cyg b
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 16.1000 (Mjup) 5118.8018 (Mearth)
Semi Major Axis / Orbital Distance Calculated 16.9000 (AU) 16.9000 (AU Est.)
Eccentricity : 0.2500
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 18656.68 (Days Est.)
Surface Gravity (G Earth) 49.4340
Star Radiation at Atmospheric Boundary: 38.4 (W/m2)
Measured Temperature (K) 1400.0 (K)
Blackbody T 0.1(K) 111.1 (K)
Blackbody T 0.3(K) 104.4 (K)
Blackbody T 0.7(K) 84.4 (K)
Tidally Locked Blackbody T 0.1(K) 132.1 (K)
Tidally Locked Blackbody T 0.3(K) 124.1 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Imaging
Mass Detection : Astrometry
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HIP 99770
Alternate Name : 29 Cyg
Star Distance(LY) : 132.9
Stellar Radius(Rsun) : 1.5 (Rsun Estimated)
Stellar Mass(Msun) : 1.9 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 8000 (K)
Spectral type : A2V
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 18.9
Apparent Magnitude: 22.0
Right Ascension(RA) 303.6333
Declination (DEC) 36.8064
Hubble Space Telescope Guide Star Catalog (GSC) ID 02683-03962
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HIP+99770&submit=SIMBAD+search
Open Exoplanet Database Link
HIP 99770 b
HIP 99770 b

  • HIP 99770 b is an exoplanet orbiting the star HIP 99770, located about 132.9 light-years (40.7 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star HIP 99770 has apparent magnitude of 22.0, with absolute magnitude of 18.9.
  • It is 1.9 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 8000 with its spectral types of A2V
  • (Projected orbit of HIP 99770 b around its host star HIP 99770)


  • The Star HIP 99770 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.049 AU ( 306570983.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.833 AU ( 423761215.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 4.316 AU ( 645718313.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 6.352 AU ( 950202785.5 km)
  • Radiation at Planetary Boundary of HIP 99770 b : 38.42 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HIP 99770)



  • Kopparapu Recent Venus for Star HIP 99770 distance : 1.928 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HIP 99770 distance : 2.443 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HIP 99770 distance : 2.359 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HIP 99770 distance : 2.581 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 99770 distance : 4.211 AU
  • Kopparapu Outer Boundary for Early Mars for Star HIP 99770 distance : 4.440 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HIP 99770)



  • Original Kopparapu Recent Venus for Star HIP 99770 distance : 2.005 AU
  • Original Kopparapu Runaway Greenhouse for Star HIP 99770 distance : 2.493 AU
  • Original Kopparapu Moist Greenhouse for Star HIP 99770 distance : 2.653 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 99770 distance : 4.286 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HIP 99770 distance : 4.457 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HIP 99770)



    (Position in Stellar Map of star HIP 99770 and its Exoplanet HIP 99770 b)



    (Zoomed position in Stellar Map of star HIP 99770 and its Exoplanet HIP 99770 b (zoom level 3))

    (Synthetic Spectrum of star HIP 99770*)
    *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