Imaginary Picture of LTT 1445A c

Display orbital revolution of LTT 1445A c around the hoststar LTT 1445A
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Exoplanet Name : LTT 1445A c
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1023 (Rjup) 1.1470 (Rearth)
Mass (Mjup / Me): 0.0049 (Mjup) 1.5420 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0396 (AU) 0.0396 (AU Est.)
Eccentricity : 0.2230
Orbital Period(Yrs) 0.0086
Orbital Period(Observed/Estimated) 3.12 (Days Obs.) 5.69 (Days Est.)
Surface Gravity (G Earth) 1.1720
Star Radiation at Atmospheric Boundary: 7094.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 409.6 (K)
Blackbody T 0.3(K) 384.7 (K)
Blackbody T 0.7(K) 311.2 (K)
Tidally Locked Blackbody T 0.1(K) 487.1 (K)
Tidally Locked Blackbody T 0.3(K) 457.5 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : LTT 1445A
Alternate Name :
Star Distance(LY) : 22.5
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3340 (K)
Spectral type : M
UV portion[%]: 0.2
Visible portion[%]: 12.5
IR portion[%]: 87.3
Metalicity : -0.3
Absolute Magnitude: 22.8
Apparent Magnitude: 22.0
Right Ascension(RA) 45.4625
Declination (DEC) -16.5933
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
LTT 1445A c
LTT 1445A c

  • LTT 1445A c is an exoplanet orbiting the star LTT 1445A, located about 22.5 light-years ( 6.9 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star LTT 1445A has apparent magnitude of 22.0, with absolute magnitude of 22.8.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3340 with its spectral types of M
  • In this planetary system, the extrasolar planet LTT 1445A c orbits around the star LTT 1445A every 3.1 days with its orbital distance of 0.04 AU ( 5924075.7 km)
  • (Projected orbit of LTT 1445A c around its host star LTT 1445A)


  • The Star LTT 1445A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.065 AU ( 9761460.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.090 AU ( 13492889.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.137 AU ( 20560177.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.202 AU ( 30255202.4 km)
  • Radiation at Planetary Boundary of LTT 1445A c : 7094.60 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star LTT 1445A)



  • Kopparapu Recent Venus for Star LTT 1445A distance : 0.074 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star LTT 1445A distance : 0.093 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star LTT 1445A distance : 0.090 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star LTT 1445A distance : 0.099 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star LTT 1445A distance : 0.183 AU
  • Kopparapu Outer Boundary for Early Mars for Star LTT 1445A distance : 0.193 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star LTT 1445A)



  • Original Kopparapu Recent Venus for Star LTT 1445A distance : 0.073 AU
  • Original Kopparapu Runaway Greenhouse for Star LTT 1445A distance : 0.097 AU
  • Original Kopparapu Moist Greenhouse for Star LTT 1445A distance : 0.097 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star LTT 1445A distance : 0.186 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star LTT 1445A distance : 0.194 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star LTT 1445A)



    (Position in Stellar Map of star LTT 1445A and its Exoplanet LTT 1445A c)



    (Zoomed position in Stellar Map of star LTT 1445A and its Exoplanet LTT 1445A c (zoom level 3))

    (Synthetic Spectrum of star LTT 1445A*)
    *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