HD 154345
HD 154345 is a sun-like star in the northern constellation Hercules, about 60 light-years away. With an apparent magnitude of +6.76, it’s barely visible to the naked eye but easy to spot with binoculars.
The star is a G-type main-sequence star (G8V), smaller and cooler than the Sun. It has about 0.89 solar masses, 0.85 solar radii, and shines with roughly 62% of the Sun’s luminosity at a temperature around 5,557 K. It’s about 4.1 billion years old and spins about once every 28 days. Its metal content is a little below solar.
HD 154345 sits about 59.6 light-years away and is slowly moving closer to us, at a radial velocity of about −47 km/s. Its habitable zone stretches roughly from 0.64 to 1.26 astronomical units, a narrower range than the Sun’s.
The star hosts at least one planet: HD 154345 b. This is a long-period, Jupiter-like planet discovered by measuring the star’s wobbles in 2006–2007. It has a nine-year orbit and is bright enough to be called a “Jupiter twin.” For a time its existence was debated because the signal could be tied to the star’s magnetic activity, but a 2021 study confirmed the planet. Later astrometry (2023) measured the planet’s true mass and orbit tilt, finding it to be nearly edge-on and likely aligned with the star’s rotation.
In short, HD 154345 is a nearby, Sun-like star with a Jupiter-like planet in a long orbit, and a habitable zone where an Earth-mass planet could potentially exist.
This page was last edited on 3 February 2026, at 10:01 (CET).