Discovered byKepler spacecraft
Discovery date2012 (dubious)
12 June 2014 (confirmed)[1]
Transit method[1]
Orbital characteristics
0.37 (± 0.007)[1] AU
Eccentricity0.833 (± 0.013)[1]
69.7546 (± 0.0007)[1] d
StarKepler-419 (KOI-1474)
Physical characteristics
Mean radius
0.96 (± 0.12)[1] RJ
Mass2.5 (± 0.3)[1] MJ
Temperature505 K (232 °C; 449 °F)

Kepler-419b (also known by its Kepler Object of Interest designation KOI-1474.01) is a hot Jupiter exoplanet orbiting the star Kepler-419, the outermost of two such planets discovered by NASA's Kepler spacecraft. It is located about 3,400 light-years (1040 parsecs from Earth in the constellation Cygnus.


Mass, radius and temperature

Kepler-419b is a hot Jupiter, an exoplanet that has a radius and mass near that of the planet Jupiter, but with an extremely high temperature. It has a temperature of 505 K (232 °C; 449 °F).[2] It has a mass of 2.5 MJ and a radius of 0.96 RJ.

Host star

The planet orbits an (F-type) star named Kepler-419. The star has a mass of 1.39 M and a radius 1.75 R. It has a surface temperatures of 6430 K and is 2.8 billion years old. In comparison, the Sun is about 4.6 billion years old[3] and has a surface temperature of 5778 K.[4]

The star's apparent magnitude, or how bright it appears from Earth's perspective, is 13. It is too dim to be seen with the naked eye.


Kepler-419c orbits its host star with 270% of the Sun's luminosity (2.7 L) about every 67 days at a distance of 0.37 AU (close to the orbital distance of Mercury from the Sun, which is 0.38 AU). It has a highly eccentric orbit, with an eccentricity of 0.833.


In 2009, NASA's Kepler spacecraft was completing observing stars on its photometer, the instrument it uses to detect transit events, in which a planet crosses in front of and dims its host star for a brief and roughly regular period of time. In this last test, Kepler observed 50000 stars in the Kepler Input Catalog, including Kepler-419, the preliminary light curves were sent to the Kepler science team for analysis, who chose obvious planetary companions from the bunch for follow-up at observatories. Observations for the potential exoplanet candidates took place between 13 May 2009 and 17 March 2012. After observing the respective transits, the first planet, Kepler-419b, was announced.[1]


  1. ^ a b c d e f g h i Dawson, Rebekah I.; John Asher Johnson; Fabrycky, Daniel C.; Foreman-Mackey, Daniel; Murray-Clay, Ruth A.; Buchhave, Lars A.; Cargile, Phillip A.; Clubb, Kelsey I.; Fulton, Benjamin J.; Hebb, Leslie; Howard, Andrew W.; Huber, Daniel; Shporer, Avi; Valenti, Jeff A. (2014). "Large eccentricity, low mutual inclination: The three-dimensional architecture of a hierarchical system of giant planets". The Astrophysical Journal. 791 (2): 89. arXiv:1405.5229. Bibcode:2014ApJ...791...89D. doi:10.1088/0004-637X/791/2/89. S2CID 29630098.
  2. ^
  3. ^ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
  4. ^ Fraser Cain (September 15, 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.

External links

Coordinates: Sky map 19h 41m 40.3s, +51° 11′ 05.15″