The mutual inclination $\psi$ between orbits within multi-planetary systems is difficult to measure directly. Through a joint analysis of RVs, Hipparcos-Gaia absolute astrometry and relative astrometry of JWST, \citet{ Bardalez2025} recently found two possible values of $\psi_{ bc}={ 32_{ -15.1}^{ +13.6}}^{ \circ}$ and $\psi_{ bc}={ 145.0_{ -11.1}^{ +15.8}}^{ \circ}$ for the nearby, non-transit planet system, 14\,Her. By incorporating additional astrometry from Gaia second data release (DR2), we have further constrained the orbital orientation of 14\,Her\,b, resulting in a definitive and unambiguous mutual inclination of $\psi_{ bc}={ 35.3_{ -7.3}^{ +6.8}}^{ \circ}$. The unusual misaligned orbital architecture of 14\,Her system may serve as a benchmark for dynamical studies.
Categories: astro-ph.EP