Lemma II was the inhabited second planet in its system. A colony with a sister facility to the Science Institute of Bilana III was located on this planet.

In 2368, this planet was the intended destination of an experimental soliton wave generated from Bilana III, three light years away. The Lemma II facility was intended to generate a particle scattering field to disperse the wave. However, the wave destabilized and accelerated out of control, threatening to destroy most of Lemma II. Fortunately, the USS Enterprise-D disrupted the wave before it arrived. (TNG: "New Ground")

This planet was only mentioned in dialogue.
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