At the time of publishing of WASP-43b's discovery on April 15, 2011, the planet was the most closely orbiting Hot Jupiter discovered.
WASP-43 was first observed between January and May 2009 by the SuperWASP project, and was found to be cooler and slightly richer in metals than the Sun.
[4] Later observations by both the WASP-South and SuperWASP-North sections of SuperWASP between January and May 2010 yielded a total of 13,768 data points.
[4] Scientists interpreted that a 0.81-day orbit of a possible planet from the data, and followed up with observations using the CORALIE spectrograph on the Leonhard Euler Telescope at Chile's La Silla Observatory.
CORALIE provided radial velocity measurements that indicated that WASP-43 was being transited by a planet that was 1.8 times Jupiter's mass, now dubbed WASP-43b.
Another follow-up using the TRAPPIST telescope further defined the light curve of the body transiting WASP-43.