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Discovered byKELT-North
Discovery date7 June 2012
Orbital characteristics
0.5504 ± 0.00086 AU (82,339,000 ± 129,000 km)
4.1137913 ± 0.00001 d
Inclination88.56 ± 1.14
2455974.60338 ± 0.00083
Semi-amplitude161.1 ± 7.8
Physical characteristics
Mean radius
1.290 ± 0.057[1] RJ
Mass1.524 ± 0.088[1] MJ
Mean density
940 ± 90 kg/m3 (1,580 ± 150 lb/cu yd)[1]
22.7 m/s2 (74 ft/s2)
2.3 g

KELT-2Ab is an extrasolar planet that orbits the star KELT-2A approximately 440 light-years away in the constellation of Auriga.[1] It was discovered by the KELT-North survey via the transit method, so both its mass and radius are known quite precisely. As of its discovery KELT-2Ab is the fifth-brightest transiting Hot Jupiter known that has a well constrained mass. This makes the KELT-2A system a promising target for future space- and ground-based follow-up observations to learn about the planet's atmosphere.

The star KELT-2A is a member of the common-proper-motion binary star system KELT-2 (HD 42176). KELT-2B is an early K dwarf approximately 295 astronomical units away.

See also[edit]


  1. ^ a b c d Beatty, Thomas G.; et al. (2012). "KELT-2Ab: A Hot Jupiter Transiting the Bright (V = 8.77) Primary Star of a Binary System". The Astrophysical Journal Letters. 756 (2). L39. arXiv:1206.1592. Bibcode:2012ApJ...756L..39B. doi:10.1088/2041-8205/756/2/L39.

External links[edit]

Coordinates: Sky map 06h 10m 39s, +30° 57′ 25″