It is smaller and less luminous than the Sun, with a spectral class of K3V, which makes it an orange-hued star.

The innermost planet, HD 219134 b, is a rocky super-Earth based on size (1.6 Earth radii), and density (6.4 grams per cubic cm).

[16][17] A number of independent studies have been done regarding the planetary system of HD 219134, with some of their results conflicting with each other.

[20] The conservative habitable zone (CHZ) of HD 219134 is estimated to extend from 0.516 to 0.948 AU.

[20] This planet is significantly more massive than Earth and therefore it likely retains a dense atmosphere, comparable to the Solar System's ice giants (see Mini-Neptune).