For WASP-178b, data was gathered over the course of eight years between May 2006 and August 2014, which was combined with follow-up observations by the CORALIE spectrograph and EulerCam, which are both part of the Swiss 1.2-metre Leonhard Euler Telescope.
[1] Another team, headed by Romy Rodríguez Martínez, independently announced discovering the planet in December 2019 as part of the Kilodegree Extremely Little Telescope (KELT) survey, labeling it KELT-26b.
This proximity to its host star, 20 times more luminous than the Sun, heats its atmosphere up to a white-hot equilibrium temperature of 2,470 K (2,200 °C; 3,990 °F), comparable to the boiling point of silver (2,162 °C[7]).
The planet's geometric albedo was measured to be between 0.1 and 0.35 by utilizing CHEOPS photometry[10] and was then further constrained to be below 0.23,[8] implying that it has a poorly reflective surface typical of gas giants.
[4] On the nightside of the planet, the atomic hydrogen recouples back into molecular H2,[10] and minerals that evaporated on the dayside may cool and condense into rock that pours down from clouds as rain.