primary
In general, the primary is the largest gravitating mass within a given system. For example, the planet around which a moon revolves is known as the primary.
In a binary or multiple star system, the primary is the most luminous star.
In general, the primary is the largest gravitating mass within a given system. For example, the planet around which a moon revolves is known as the primary.
In a binary or multiple star system, the primary is the most luminous star.
