HAT-P-14b, officially named Sissi also known as WASP-27b,[4] is an extrasolar planet located approximately 224.2 ± 0.6 parsecs (731.2 ± 2.0 ly)[5] away in the constellation of Hercules, orbiting the 10th magnitude F-type main-sequence star HAT-P-14.

The name was selected by Austria as part of the NameExoWorlds campaign for the 100th anniversary of the IAU.

[9][10] HAT-P-14b was selected as the target object for testing the James Webb Space Telescope instruments intended for spectroscopic studies of transiting exoplanets.

It was chosen because its high surface gravity should produce a very flat spectrum, regardless of the planet's composition.

Observations of the Rossiter–McLaughlin effect with the Keck telescope show that it orbits in a retrograde fashion relative to the rotation axes of its parent star,[12] spin-orbit angle equal to -170.9±5.1°.