KELT-2Ab
KELT-2Ab is an extrasolar planet that orbits the star KELT-2A approximately 440 light-years away in the constellation of Auriga. 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.
| Discovery | |
|---|---|
| Discovered by | KELT-North |
| Discovery date | 7 June 2012 |
| Transit | |
| Orbital characteristics | |
| 0.5504 ± 0.00086 AU (82,339,000 ± 129,000 km) | |
| Eccentricity | 0 |
| 4.1137913 ± 0.00001 d | |
| Inclination | 88.56 ± 1.14 |
| 2455974.60338 ± 0.00083 | |
| 90 | |
| Semi-amplitude | 161.1 ± 7.8 |
| Star | KELT-2A |
| Physical characteristics | |
Mean radius | 1.290 ± 0.057 RJ |
| Mass | 1.524 ± 0.088 MJ |
Mean density | 940 ± 90 kg/m3 (1,580 ± 150 lb/cu yd) |
| 22.7 m/s2 (74 ft/s2) 2.3 g | |
| Temperature | 1994±104 K or 1782±111 K |
The water vapour was detected in planetary atmosphere in 2018.
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.
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