KELT-3b is an extrasolar planet orbiting the F-type main-sequence star KELT-3 690 light years in the zodiac constellation Leo. It was discovered in 2013 by KELT's telescope in Arizona.

KELT-3b compared to Jupiter
KELT-3b compared to Jupiter
Discovered byPepper et al. 2013
Discovery date2013
Orbital characteristics
0.04120 ± 0.00067[1]AU
2.7033902 d[1]
Physical characteristics
Mean radius


This planet has 44% more mass than Jupiter, but has expanded to 1.34 times the radius of the latter. It has a temperature of 1,811 K, which gives it a Hot Jupiter class. KELT-3b has a lower density than Jupiter, and completes a revolution in less in 3 days. This corresponds with an orbital distance of 0.04 AU, which is 10 times closer than Mercury (planet) orbits the Sun.

The planetary equilibrium temperature is 1829±42 K, but measured temperature is hotter at 2132±133 K.[3] The radiation of the moderately active host star KELT-3 do not produce a detectable ionization and consequent Lyman-alpha line emission in the atmosphere of the KELT-3b. [4]


KELT-3b was discovered in 2013. The light curves and parameters of both the planet and the star were observed. The paper also states that there is uncertainty about the system[further explanation needed] age.[1]


  1. ^ a b c d e Pepper, Joshua; Siverd, Robert J.; Beatty, Thomas G.; Gaudi, B. Scott; Stassun, Keivan G.; Eastman, Jason; Collins, Karen; Latham, David W.; Bieryla, Allyson; Buchhave, Lars A.; Jensen, Eric L. N. (2013-08-01). "KELT-3b: A Hot Jupiter Transiting a V = 9.8 Late-F Star". The Astrophysical Journal. 773 (1): 64. arXiv:1211.1031. Bibcode:2013ApJ...773...64P. doi:10.1088/0004-637X/773/1/64. ISSN 0004-637X. S2CID 14691090.
  2. ^ a b Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2017-03-01). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. ISSN 0004-6256. S2CID 119219062.
  3. ^ a b Garhart, Emily; Deming, Drake; Mandell, Avi; Knutson, Heather A.; Wallack, Nicole; Burrows, Adam; Fortney, Jonathan J.; Hood, Callie; Seay, Christopher; Sing, David K.; Benneke, Björn (2020-04-01). "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses". The Astronomical Journal. 159 (4): 137. arXiv:1901.07040. Bibcode:2020AJ....159..137G. doi:10.3847/1538-3881/ab6cff. hdl:1983/cfa40930-a3fa-477f-abd9-c4937e03fdae. ISSN 0004-6256. S2CID 119209434.
  4. ^ Alavi, S. A.; Rezaei, N. (2017-05-01). "Dirac equation, hydrogen atom spectrum and the Lamb shift in dynamical non-commutative spaces". Pramana. 88 (5): 77. arXiv:1612.05942. Bibcode:2017Prama..88...77A. doi:10.1007/s12043-017-1381-4. ISSN 0304-4289. S2CID 119588205.