Imaginary Picture of 55 Cnc Ac

Display orbital revolution of 55 Cnc Ac around the hoststar 55 Cnc A
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Exoplanet Name : 55 Cnc Ac
Alternate Name : rho1 Cnc Ac
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 0.1784 (Mjup) 56.7201 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.2374 (AU) 0.2374 (AU Est.)
Eccentricity : 0.0720
Orbital Period(Yrs) 0.1215
Orbital Period(Observed/Estimated) 44.37 (Days Obs.) 44.52 (Days Est.)
Surface Gravity (G Earth) 0.5478
Star Radiation at Atmospheric Boundary: 15336.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 496.7 (K)
Blackbody T 0.3(K) 466.4 (K)
Blackbody T 0.7(K) 377.4 (K)
Tidally Locked Blackbody T 0.1(K) 590.6 (K)
Tidally Locked Blackbody T 0.3(K) 554.7 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : 55 Cnc A
Alternate Name : "TOI-1773, HD 75732, GJ 324 A, rho1 Cnc A"
Star Distance(LY) : 41.0
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 10.2 (GY)
Temperature : 5250 (K)
Spectral type : G8V
UV portion[%]: 5.4
Visible portion[%]: 40.8
IR portion[%]: 53.7
Metalicity : 0.3
Absolute Magnitude: 5.5
Apparent Magnitude: 6.0
Right Ascension(RA) 133.1542
Declination (DEC) 28.3339
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
55 Cnc Ac
55 Cnc Ac

  • 55 Cnc Ac is an exoplanet orbiting the star 55 Cnc A, located about 41.0 light-years (12.6 pc) away from Solar System. Its discovery was publicly announced on 2002.
  • The host star 55 Cnc A has apparent magnitude of 6.0, with absolute magnitude of 5.5.
  • It is 0.9 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5250 with its spectral types of G8V
  • In this planetary system, the extrasolar planet 55 Cnc Ac orbits around the star 55 Cnc A every 44.4 days with its orbital distance of 0.24 AU ( 35507054.6 km)
  • (Projected orbit of 55 Cnc Ac around its host star 55 Cnc A)


  • The Star 55 Cnc A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.575 AU ( 86020706.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.795 AU ( 118903096.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.211 AU ( 181182006.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.782 AU ( 266617259.0 km)
  • Radiation at Planetary Boundary of 55 Cnc Ac : 15336.14 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 55 Cnc A)



  • Kopparapu Recent Venus for Star 55 Cnc A distance : 0.614 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 55 Cnc A distance : 0.778 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 55 Cnc A distance : 0.751 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 55 Cnc A distance : 0.824 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 55 Cnc A distance : 1.396 AU
  • Kopparapu Outer Boundary for Early Mars for Star 55 Cnc A distance : 1.473 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 55 Cnc A)



  • Original Kopparapu Recent Venus for Star 55 Cnc A distance : 0.610 AU
  • Original Kopparapu Runaway Greenhouse for Star 55 Cnc A distance : 0.801 AU
  • Original Kopparapu Moist Greenhouse for Star 55 Cnc A distance : 0.807 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 55 Cnc A distance : 1.420 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 55 Cnc A distance : 1.477 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 55 Cnc A)



    (Position in Stellar Map of star 55 Cnc A and its Exoplanet 55 Cnc Ac)



    (Zoomed position in Stellar Map of star 55 Cnc A and its Exoplanet 55 Cnc Ac (zoom level 3))

    (Synthetic Spectrum of star 55 Cnc 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