| KELT-4Ab | |
| Discoverer: | KELT-North |
| Discovered: | 2015 |
| Apsis: | astron |
| Semimajor: | 0.04321± |
| Eccentricity: | 0.03 ± 0.021 |
| Period: | 2.9895933 (± 4.9e-06) d |
| Inclination: | 83.11 ± 0.057 |
| Mean Radius: | 1.706 ± 0.085 |
| Mass: | 0.878 ± 0.07 |
KELT-4Ab is an extrasolar planet that orbits the star KELT-4A, in the star system KELT-4. The planet is approximately 760abbr=onNaNabbr=on away in the constellation of Leo. The planet was discovered by the Kilodegree Extremely Little Telescope (KELT).
The exoplanet was discovered by transit and is a Hot Jupiter planet orbiting a star in a triple star system, KELT-4. It is the fourth planet found in such a system. As KELT-4A is the brightest host (V~10) of a Hot Jupiter in a hierarchical triple stellar system found so far researchers expect it may be useful in learning more about inflated planets.
KELT-4 is a triple star system. KELT-4BC is a binary star system subcomponent of the triple, 328± away from KELT-4A and the projected separation between KELT-4B and KELT-4C is 10.3±.