KELT-4Ab

KELT-4Ab is an extrasolar planet that orbits the star KELT-4A, in the star system KELT-4. The planet is approximately 760 ly (230 pc) away^[3] in the constellation of Leo.^[4] The planet was discovered by the Kilodegree Extremely Little Telescope (KELT).

KELT-4Ab

Discovery
Discovered by	KELT-North
Discovery date	2015[1]
Detection method	Transit
Orbital characteristics
Semi-major axis	0.04321 ± 0.00085 AU (6,464,000 ± 127,000 km)[2]
Eccentricity	0.03 ± 0.021[2]
Orbital period (sidereal)	2.9895933 (± 4.9e-06)[2] d
Inclination	83.11 ± 0.057[2]
Star	KELT-4A
Physical characteristics
Mean radius	1.706 ± 0.085[2] RJ
Mass	0.878 ± 0.07[2] MJ

Characteristics

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.^[5] 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.^[1][6]

Star system

KELT-4 is a triple star system. KELT-4BC is a binary star system subcomponent of the triple, 328 ± 16 AU (4.91×10¹⁰ ± 2.4×10⁹ km; 3.05×10¹⁰ ± 1.5×10⁹ mi) away from KELT-4A and the projected separation between KELT-4B and KELT-4C is 10.30 ± 0.74 AU (1.541×10⁹ ± 111,000,000 km; 957,000,000 ± 69,000,000 mi).^[1]

See also

• Gliese 667 Cc, a planet in a triple star system
• KELT-2Ab, a previous planet discovered by the KELT survey, in a binary system