Comparison of the Ca II H line for BD −10°3166 (dotted line) and the chromospherically inactive K0 V star HD 143291 (solid line). The lack of core reversal in the H line for BD −10°3166 indicates the star is chromospherically inactive. The similarity in the H line and the other metal lines supports the assignment of K0 V spectral type to BD −10°3166, although BD −10°3166 appears metal‐rich relative to HD 143291.