Imaginary Picture of MASCARA-1 b

Display orbital revolution of MASCARA-1 b around the hoststar MASCARA-1
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Exoplanet Name : MASCARA-1 b
Alternate Name : HD 201585 b
Status : Confirmed
Radius (Rjup / Re): 1.5000 (Rjup) 16.8135 (Rearth)
Mass (Mjup / Me): 3.7000 (Mjup) 1176.3706 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0430 (AU) 0.0430 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0059
Orbital Period(Observed/Estimated) 2.15 (Days Obs.) 2.48 (Days Est.)
Surface Gravity (G Earth) 4.1613
Star Radiation at Atmospheric Boundary: 9523890.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 2479.4 (K)
Blackbody T 0.3(K) 2328.4 (K)
Blackbody T 0.7(K) 1883.9 (K)
Tidally Locked Blackbody T 0.1(K) 2948.5 (K)
Tidally Locked Blackbody T 0.3(K) 2769.0 (K)
Size Class: Super-Jupiter-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 : MASCARA-1
Alternate Name : HD 201585
Star Distance(LY) : 615.5
Stellar Radius(Rsun) : 2.1 (Rsun Measured)
Stellar Mass(Msun) : 1.7 (Msun Measured) 2.3 (Msun Estimated)
Star Age : 1.0 (GY)
Temperature : 7554 (K)
Spectral type : A8
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 1.9
Apparent Magnitude: 8.3
Right Ascension(RA) 317.5516
Declination (DEC) 10.7389
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
MASCARA-1 b
MASCARA-1 b

  • MASCARA-1 b is an exoplanet orbiting the star MASCARA-1, located about 615.5 light-years (188.7 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star MASCARA-1 has apparent magnitude of 8.3, with absolute magnitude of 1.9.
  • It is 1.7 times more massive and 2.1 times bigger compared with our Sun. The surface temperature is 7554 with its spectral types of A8
  • In this planetary system, the extrasolar planet MASCARA-1 b orbits around the star MASCARA-1 every 2.1 days with its orbital distance of 0.04 AU ( 6432708.4 km)
  • (Projected orbit of MASCARA-1 b around its host star MASCARA-1)


  • The Star MASCARA-1 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.596 AU ( 388357206.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 3.588 AU ( 536811148.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 5.468 AU ( 817981394.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 8.046 AU ( 1203695455.9 km)
  • Radiation at Planetary Boundary of MASCARA-1 b : 9523890.88 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star MASCARA-1)



  • Kopparapu Recent Venus for Star MASCARA-1 distance : 2.457 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star MASCARA-1 distance : 3.112 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star MASCARA-1 distance : 3.005 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star MASCARA-1 distance : 3.290 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star MASCARA-1 distance : 5.366 AU
  • Kopparapu Outer Boundary for Early Mars for Star MASCARA-1 distance : 5.659 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star MASCARA-1)



  • Original Kopparapu Recent Venus for Star MASCARA-1 distance : 2.548 AU
  • Original Kopparapu Runaway Greenhouse for Star MASCARA-1 distance : 3.180 AU
  • Original Kopparapu Moist Greenhouse for Star MASCARA-1 distance : 3.371 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star MASCARA-1 distance : 5.464 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star MASCARA-1 distance : 5.682 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star MASCARA-1)



    (Position in Stellar Map of star MASCARA-1 and its Exoplanet MASCARA-1 b)



    (Zoomed position in Stellar Map of star MASCARA-1 and its Exoplanet MASCARA-1 b (zoom level 3))

    (Synthetic Spectrum of star MASCARA-1*)
    *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