HD 164604 c is a heavyweight gas giant orbiting a K-type star 128 light-years away, with an estimated radius around 12.3 × Earth and mass up to 9.5 Jupiter masses. It follows a wide 14.8-year orbit at 5.56 AU, far from the star’s influence. As a second giant in its system, it offers insights into long-period planet dynamics and mutual inclinations. This imposing world endures in the Galactic Codex, representing the majestic scale and stability of distant gas giants in mature planetary architectures.
