HD 34445
Introduction   '''HD 34445''' is a star in the equatorial constellation of Orion. With an apparent visual magnitude of 7.31, it is a 7th magnitude star that is too dim to be readily visible to the naked eye. The system is located at a distance of 150.5 light years from the Sun based on parallax measurements, but is drifting closer with a high radial velocity of −79 km/s. It is expected to draw as close as  in ~492,000 years.This is an ordinary G-type main-sequence star with a stellar classification of G0 V, which means it is a Sun-like star that is generating energy through core hydrogen fusion. It is considered a metal-rich star, showing a much higher metallicity compared to the Sun. Despite this it is an older star and chromospherically quiet, lying about 0.8 magnitudes above the main sequence. This star is larger, hotter, brighter, and more massive than the Sun. It is spinning with a projected rotational velocity of ~3 km/s, giving it a rotation period of around 22 days.
Planetary companions In 2004, a gas giant was found in orbit around the star, but it was not until 2009 that this planet was confirmed. In 2017, five more planets were found. All have minimum masses significantly greater than that of the Earth, between  and . The system as configured appears to be dynamically stable.A 2021 study was only able to confirm HD 34445 b as a planet. HD 34445 e was found to likely be an artifact of the stellar rotation, HD 34445 c & d were also found to likely be false positives, and HD 34445 f was not detected.
See also * HD 126614* HD 24496* HD 13931* Gliese 179* QS Virginis* List of extrasolar planets
References