Imaginary Picture of lam Ser b

Display orbital revolution of lam Ser b around the hoststar lam Ser
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Exoplanet Name : lam Ser b
Alternate Name : "27 Ser b, HD 141004 b, HIP 77257 b"
Status : Confirmed
Radius (Rjup / Re): 0.2110 (Rjup) 2.3651 (Rearth)
Mass (Mjup / Me): 0.0428 (Mjup) 13.6077 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1238 (AU) 0.1238 (AU Est.)
Eccentricity : 0.1600
Orbital Period(Yrs) 0.0425
Orbital Period(Observed/Estimated) 15.51 (Days Obs.) 14.09 (Days Est.)
Surface Gravity (G Earth) 2.4328
Star Radiation at Atmospheric Boundary: 150147.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 878.6 (K)
Blackbody T 0.3(K) 825.1 (K)
Blackbody T 0.7(K) 667.6 (K)
Tidally Locked Blackbody T 0.1(K) 1044.8 (K)
Tidally Locked Blackbody T 0.3(K) 981.2 (K)
Size Class: sub-Neptune-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 : lam Ser
Alternate Name : "27 Ser, HD 141004, HIP 77257"
Star Distance(LY) : 38.5
Stellar Radius(Rsun) : 1.2 (Rsun Estimated)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6050 (K)
Spectral type : G0
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : 0.0
Absolute Magnitude: 21.6
Apparent Magnitude: 22.0
Right Ascension(RA) 236.6125
Declination (DEC) 7.3531
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
lam Ser b
lam Ser b

  • lam Ser b is an exoplanet orbiting the star lam Ser, located about 38.5 light-years (11.8 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star lam Ser has apparent magnitude of 22.0, with absolute magnitude of 21.6.
  • It is 1.3 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 6050 with its spectral types of G0
  • In this planetary system, the extrasolar planet lam Ser b orbits around the star lam Ser every 15.5 days with its orbital distance of 0.12 AU ( 18520216.4 km)
  • (Projected orbit of lam Ser b around its host star lam Ser)


  • The Star lam Ser 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.938 AU ( 140389568.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.297 AU ( 194055072.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.977 AU ( 295696985.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.909 AU ( 435131067.8 km)
  • Radiation at Planetary Boundary of lam Ser b : 150147.11 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star lam Ser)



  • Kopparapu Recent Venus for Star lam Ser distance : 0.957 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star lam Ser distance : 1.212 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star lam Ser distance : 1.170 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star lam Ser distance : 1.283 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star lam Ser distance : 2.125 AU
  • Kopparapu Outer Boundary for Early Mars for Star lam Ser distance : 2.242 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star lam Ser)



  • Original Kopparapu Recent Venus for Star lam Ser distance : 0.963 AU
  • Original Kopparapu Runaway Greenhouse for Star lam Ser distance : 1.244 AU
  • Original Kopparapu Moist Greenhouse for Star lam Ser distance : 1.275 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star lam Ser distance : 2.163 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star lam Ser distance : 2.250 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star lam Ser)



    (Position in Stellar Map of star lam Ser and its Exoplanet lam Ser b)



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

    (Synthetic Spectrum of star lam Ser*)
    *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