From radial velocity (RV) detections alone one does not get all orbital parameters needed to derive the true mass of a non-transiting. unresolved substellar companion to a star. Additional astrometric measurements are needed to calculate the inclination and the longitude of the ascending node. Until today only few true substellar companion masses have been determined by this method wi... https://chefesquipmenters.shop/product-category/dipper-wells/