WASP-21
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Through Stellar classification, Light-year and Constellation
The survey in 2012 have failed to find any stellar companions to WASP-21.
Naming
In 2019 the WASP-21 system was chosen as part of the NameExoWorlds campaign organised by the International Astronomical Union, which assigned each country a star and planet to be named. WASP-21 was assigned to Bulgaria. The winning proposal named the star Tangra after a deity worshipped by the early Bulgars, and the planet Bendida after a deity worshipped by the Thracians.
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Planetary System
In 2010 WASP-21 was discovered to host a hot Jupiter type planet by the Wide Angle Search for Planets (WASP). and confirmed by radial velocity by the WASP team in 2010.
Transit-timing variation analysis in 2015 did not find an additional planets in the system.
In 2020, spectroscopic analysis has found the WASP-21 b atmosphere is mostly cloudless and contains sodium.