The inner planet, HD 21693 b, has a minimum mass of and is the transition regime between super-Earths and Neptune-mass planets. Since the radial velocity method used in its discovery cannot determine the inclination of its orbit, the planet's true mass cannot be determined, although the true mass is usually close to the minimum value. This planet orbits the star at a distance of 0.15 AU with a period of 22.7 days.
