WASP-121


WASP-121 is a magnitude 10.4 star located approximately 850 light-years away in the constellation Puppis. WASP-121 has a mass and radius similar to the Sun. Its planet WASP-121b orbits around WASP-121 in about 1.27 days. WASP-121b is the first exoplanet found to contain water in an extrasolar planetary stratosphere.

Planetary system

In 2015, the extrasolar planet WASP-121b was discovered orbiting WASP-121 by the transit method. WASP-121b is a "hot Jupiter" exoplanet with a mass about 1.18 times that of Jupiter and a radius about 1.81 times that of Jupiter. The exoplanet orbits WASP-121, its host star, every 1.27 days. Hot water molecules have been found in the stratosphere of WASP-121b.

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