HD 191939

HD 191939 is a G-type main-sequence star located approximately 175 light-years away from Earth in the constellation Delphinus. It is similar in size and temperature to our Sun, though it may be slightly more massive. HD 191939 is notable for being a host star to a confirmed exoplanetary system.

The HD 191939 system consists of at least three confirmed exoplanets: HD 191939 b, HD 191939 c, and HD 191939 d. These planets were discovered using the radial velocity method, which detects the wobble in a star's motion caused by the gravitational pull of orbiting planets. All three planets are gas giants and are significantly more massive than Earth. They orbit relatively close to their host star, resulting in short orbital periods.

The existence of multiple planets in the HD 191939 system makes it a subject of interest for astronomers studying planetary formation and dynamics. The system offers valuable insights into the diversity of planetary systems beyond our own and helps refine models of how planets form and evolve around stars. Further research and observations are ongoing to better characterize the properties of the planets and their orbits, and to potentially search for additional planets in the system.