HD 21749 HD 21749 is an orange main-sequence star about 0.68 the mass of the Sun in the constellation Reticulum , located about from Earth . On 7 January 2019 , it was announced that the star has two exoplanets: a possibly rocky , hot sub-Neptune-sized exoplanet , named HD 21749b ; and, a sub-Earth exoplanet, tentatively named HD 21749c . These exoplanets were discovered by the Transiting Exoplanet Survey Satellite .Stellar characteristics HD 21749 is a star that is approximately 68% the mass of and 76% the radius of the Sun . It has a surface temperature of 4571 K . In comparison , the Sun has a surface temperature of 5778 K.apparent magnitude , or how bright it appears from Earth's perspective, is 8.143.HD 21749 has two known planets orbiting around it: HD 21749b is a confirmed hot Neptune-sized, possibly rocky, exoplanet; and, HD 21749c is a sub-Earth-sized exoplanet.
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