Imaginary Picture of LTT 3780 c
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Exoplanet Name : LTT 3780 c
Alternate Name : "LP 729-54 c, TOI-732 c"
Radius (Rjup / Re): 0.2050 (Rjup) 2.2978 (Rearth)
Mass (Mjup / Me): 0.0267 (Mjup) 8.4889 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0770 (AU) 0.0770 (AU Est.)
Eccentricity : 0.1150
Orbital Period(Yrs) 0.0335
Orbital Period(Observed/Estimated) 12.25 (Days Obs.) 12.32 (Days Est.)
Star Radiation at Atmospheric Boundary: 3687.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 347.8 (K)
Blackbody T 0.3(K) 326.6 (K)
Blackbody T 0.7(K) 264.3 (K)
Tidally Locked Blackbody T 0.1(K) 413.6 (K)
Tidally Locked Blackbody T 0.3(K) 388.4 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Spectrum
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : LTT 3780
Alternate Name : "LP 729-54, TOI-732"
Star Distance(LY) : 71.7
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3360 (K)
Spectral type : M4V
Metalicity : 0.3
Absolute Magnitude: 11.3
Apparent Magnitude: 13.0
Right Ascension(RA) 154.6464
Declination (DEC) -11.7178
Hubble Space Telescope Guide Star Catalog (GSC) ID
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=LTT+3780+&submit=SIMBAD+search
Open Exoplanet Database Link
LTT 3780 c
LTT 3780 c

  • LTT 3780 c is an exoplanet orbiting the star LTT 3780, located about 71.7 light-years (22.0 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star LTT 3780 has apparent magnitude of 13.0, with absolute magnitude of 11.3.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3360 with its spectral types of M4V
  • In this planetary system, the extrasolar planet LTT 3780 c orbits around the star LTT 3780 every 12.3 days with its orbital distance of 0.08 AU ( 11519036.0 km)
  • (Projected orbit of LTT 3780 c around its host star LTT 3780)


  • The Star LTT 3780 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.091 AU ( 13683848.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.126 AU ( 18914655.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.193 AU ( 28821748.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.284 AU ( 42412465.8 km)
  • Radiation at Planetary Boundary of LTT 3780 c : 3687.43 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star LTT 3780)



  • Kopparapu Recent Venus for Star LTT 3780 distance : 0.104 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star LTT 3780 distance : 0.131 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star LTT 3780 distance : 0.126 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star LTT 3780 distance : 0.139 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star LTT 3780 distance : 0.257 AU
  • Kopparapu Outer Boundary for Early Mars for Star LTT 3780 distance : 0.271 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star LTT 3780)



  • Original Kopparapu Recent Venus for Star LTT 3780 distance : 0.103 AU
  • Original Kopparapu Runaway Greenhouse for Star LTT 3780 distance : 0.136 AU
  • Original Kopparapu Moist Greenhouse for Star LTT 3780 distance : 0.136 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star LTT 3780 distance : 0.261 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star LTT 3780 distance : 0.271 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star LTT 3780)



    (Position in Stellar Map of star LTT 3780 and its Exoplanet LTT 3780 c)



    (Zoomed position in Stellar Map of star LTT 3780 and its Exoplanet LTT 3780 c (zoom level 3))