description HD 21749 b Overview
HD 21749 b is a confirmed transiting planet orbiting the K-type star HD 21749 in the southern constellation Reticulum. NASA's Transiting Exoplanet Survey Satellite identified its transit in data released in 2019, and follow-up observations established a radius about 2.8 times Earth's and a mass of roughly 23 Earths. Its approximately 35.6-day orbit made it a notable early TESS discovery because it was longer than the periods of most planets found in the mission's first results.
help HD 21749 b FAQ
How was HD 21749 b discovered?
NASA's Transiting Exoplanet Survey Satellite, or TESS, identified its transit in data released in 2019. Follow-up observations then measured the planet's size and orbit around the K-type star HD 21749.
How large is HD 21749 b compared with Earth?
Its radius is about 2.8 times Earth's. That places it in the larger-than-Earth class of planets, even though it is not described as a Jupiter-sized gas giant.
What type of star does HD 21749 b orbit?
It orbits HD 21749, a K-type star in the southern constellation Reticulum. K-type stars are cooler and less massive than the Sun.
Why was HD 21749 b important for early TESS discoveries?
It was one of the notable transiting planets identified from TESS data released in 2019. Its relatively large size made the transit signal measurable and allowed follow-up characterization.
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