Orbital parallax of binary systems

Multiple systems where the astrometric and spectroscopic orbit are known offer the unique possibility to determine the distance to these systems directly without any...已测得天体测量轨道（astrometric orbit）与分光轨道（spectroscopic orbit）的多组天体系统，为无需借助其他手段直接测定该类系统的距离提供了独特可行的途径……