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Exoplanet List of exoplanets
Parent star
Star KELT-2A
Constellation Auriga
Right ascension (α) 06h 10m 39.347s[1]
Declination (δ) +30° 57′ 25.70″[1]
Distance440±20[1] ly
(134±6[1] pc)
Spectral type F7V
Orbital elements
Semi-major axis(a) 0.5504 ± 0.00086 AU
Eccentricity (e) 0
Orbital period(P) 4.1137913 ± 0.00001 d
Inclination (i) 88.56 ± 1.14°
Argument of
(ω) 90°
Time of periastron (T0) 2455974.60338 ± 0.00083 JD
Semi-amplitude (K) 161.1 ± 7.8 m/s
Physical characteristics
Mass(m)1.524 ± 0.088[2] MJ
Radius(r)1.290 ± 0.057[2] RJ
Density(ρ)940 ± 90[2] kg m−3
Surface gravity(g)22.7 m/s² (2.3 g)
Discovery information
Discovery date 7 June 2012
Discoverer(s) KELT-North
Discovery method Transit
Discovery status Published

KELT-2Ab is an extrasolar planet that orbits the star KELT-2A approximately 440 light-years away in the constellation of Auriga.[2] 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 Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  2. ^ 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″