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Exoplanet List of exoplanets
Size comparison
Earth Kepler-37d
The Earth seen from Apollo 17.jpg Exoplanet
Parent star
Star Kepler-37
Declination (δ) +44d31m05.3s [1]
Mass (m) 0.80±0.07 M
Radius (r) 0.77±0.03 R
Temperature (T) 5417±75 K
Metallicity [Fe/H] -0.32±0.07
Age 5.66 Gyr
Physical characteristics
Radius (r) 1.99 [2] R
Temperature (T) 182 °C (455 K; 360 °F)
Orbital elements
Semi-major axis (a) 0.2076+0.0016
Eccentricity (e) 0.15+0.07
Orbital period (P) 39.79 d
Inclination (i) 89.335+0.043
[3] [4]°
Discovery information
Discovery date 2013
Discovery method Transit
Discovery site Kepler Space Observatory
Discovery status Confirmed

Kepler-37d is an extrasolar planet (exoplanet) discovered by the Kepler space telescope in February 2013.[5] It is located 210 light years away,[6] in the constellation Lyra.[5] With an orbital period of 40 days,[6] it is the largest of the three known planets orbiting its parent star Kepler-37.[6]

See also[edit]


  1. ^
  2. ^
  3. ^
  4. ^ Barclay, T. et al. A sub-Mercury-sized exoplanet. Nature 494, 452-454 (2013).
  5. ^ a b Black, Charles. "NASA's Kepler discovers small planet system". SEN TV LIMITED. Retrieved 25 February 2013. 
  6. ^ a b c Harwood, William. "Kepler telescope spots smallest exoplanet yet". Spaceflight Now Inc. Retrieved 25 February 2013.