Exoplanet Discovery Calculator: Transit, Radial Velocity, Habitable Zone

Your details

Each mode solves for a different exoplanet property. All modes use the same star inputs where relevant.
Mass of the host star in solar masses (M☉). The Sun = 1.0, red dwarfs ~ 0.1-0.5, massive stars up to ~100.
M☉
Radius of the host star in solar radii (R☉). The Sun = 1.0, red dwarfs ~ 0.1-0.5, supergiants up to ~1000.
R☉
The fractional dimming of the star during transit, expressed as a percentage. A 1% dip means the planet blocks 1% of stellar light.
%
Average distance between the star and planet. Earth = 1.0 AU, Mercury = 0.39 AU, Jupiter = 5.2 AU.
AU
Planet radius
10.92R⊕

Derived from the fractional drop in stellar brightness during transit (Rp = R☉ × √δ)

Planet radius (Jupiter)0.973R♃
Planet radius (km)69,570km
Transit depth10,000ppm
Planet radius (m)69,570,000
Radius (R⊕)10.92
Radius (R♃)0.973

Planet radius is approximately 10.92 R⊕ (0.973 R♃).

  • A 1.000% transit dip (10000 ppm) is consistent with a Jupiter-class gas giant around a 1.0 R☉ star.
  • At 0.97 R♃ this is likely a gas giant - follow-up RV observations can measure its mass and density.
  • Kepler detected dips as small as 20 ppm; TESS typically requires >1,000 ppm. Your signal at 10000 ppm would be detectable by TESS.

Next stepUse Radial Velocity mode to calculate the expected stellar wobble for mass determination and density estimation.

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