WASP-43b, formally named Astrolábos,[2] is a transiting planet in orbit around the young, active, and low-mass star WASP-43 in the constellation Sextans.

WASP-43b was flagged as a candidate by the SuperWASP program, before they conducted follow-ups using instruments at La Silla Observatory in Chile, which confirmed its existence and provided orbital and physical characteristics.

[1] At the time of its discovery, the size of WASP-43b's orbit was the smallest known for a hot Jupiter,[1] probably due to its host star's low mass.

[1] Later observation by both SuperWASPs in the Northern and Southern Hemispheres led to the collection of 13,768 data points between January and May 2010 and to the use of the CORALIE spectrograph at La Silla Observatory in Chile.

Fourteen measurements using the radial velocity method confirmed WASP-43b as a planet, revealing its mass in the process.

[1] WASP-43b, along with the planets WASP-19b and WASP-18b, conflicted with currently accepted models of tidal movements derived from observations of the orbits of binary star systems.

[1] No orbital decay driven by tidal dissipation was detected in 2016, placing a lower limit of 10 million years on the remaining planetary lifetime.

Climate modelling suggests the carbon monoxide concentration may be variable, while the atmospheric spectrum of WASP-43b is dominated by clouds made of refractory mineral particles, with a small contribution from hydrocarbon haze.