WASP-78, is a single F-type main-sequence star about 2350 light-years away. It is likely to be younger than the Sun at 3.4+1.5−0.8 billion years. WASP-78 is depleted in heavy elements, having a 45% concentration of iron compared to the Sun.
Planetary system In 2012 a transiting hot Jupiter planet b was detected on a circular orbit. The planetary equilibrium temperature is 2350±80 K, while the nightside temperature measured in 2019 is 2200±41 K. The dayside planetary temperature measured in 2020 is 2,560±130 K. A survey in 2016 measured a Rossiter-McLaughlin effect and found the planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to −6.4±5.9° The planet cannot have formed in its current orbit and has likely undergone in the past a migration from the initial highly eccentric orbit.
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