Imaginary Picture of HD 22946 c

Display orbital revolution of HD 22946 c around the hoststar HD 22946
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Exoplanet Name : HD 22946 c
Alternate Name : TOI-411 c
Status : Confirmed
Radius (Rjup / Re): 0.2444 (Rjup) 2.7395 (Rearth)
Mass (Mjup / Me): 0.0212 (Mjup) 6.7351 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0939 (AU) 0.0939 (AU Est.)
Eccentricity : 0.1600
Orbital Period(Yrs) 0.0262
Orbital Period(Observed/Estimated) 9.57 (Days Obs.) 10.00 (Days Est.)
Surface Gravity (G Earth) 0.8974
Star Radiation at Atmospheric Boundary: 276889.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1023.8 (K)
Blackbody T 0.3(K) 961.5 (K)
Blackbody T 0.7(K) 777.9 (K)
Tidally Locked Blackbody T 0.1(K) 1217.5 (K)
Tidally Locked Blackbody T 0.3(K) 1143.4 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 22946
Alternate Name : TOI-411
Star Distance(LY) : 205.1
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 5.0 (GY)
Temperature : 6210 (K)
Spectral type : F7/F8V
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.1
Absolute Magnitude: 4.3
Apparent Magnitude: 8.3
Right Ascension(RA) 54.8208
Declination (DEC) -42.7625
Hubble Space Telescope Guide Star Catalog (GSC) ID 07575-00174
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+22946&submit=SIMBAD+search
Open Exoplanet Database Link
HD 22946 c
HD 22946 c

  • HD 22946 c is an exoplanet orbiting the star HD 22946, located about 205.1 light-years (62.9 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star HD 22946 has apparent magnitude of 8.3, with absolute magnitude of 4.3.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 6210 with its spectral types of F7/F8V
  • In this planetary system, the extrasolar planet HD 22946 c orbits around the star HD 22946 every 9.6 days with its orbital distance of 0.09 AU ( 14047240.1 km)
  • (Projected orbit of HD 22946 c around its host star HD 22946)


  • The Star HD 22946 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.967 AU ( 144602123.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.336 AU ( 199877924.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.036 AU ( 304569723.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.996 AU ( 448187690.7 km)
  • Radiation at Planetary Boundary of HD 22946 c : 276889.66 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 22946)



  • Kopparapu Recent Venus for Star HD 22946 distance : 0.976 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 22946 distance : 1.236 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 22946 distance : 1.194 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 22946 distance : 1.308 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 22946 distance : 2.161 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 22946 distance : 2.279 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 22946)



  • Original Kopparapu Recent Venus for Star HD 22946 distance : 0.986 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 22946 distance : 1.268 AU
  • Original Kopparapu Moist Greenhouse for Star HD 22946 distance : 1.305 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 22946 distance : 2.200 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 22946 distance : 2.287 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 22946)



    (Position in Stellar Map of star HD 22946 and its Exoplanet HD 22946 c)



    (Zoomed position in Stellar Map of star HD 22946 and its Exoplanet HD 22946 c (zoom level 3))

    (Synthetic Spectrum of star HD 22946*)
    *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