79360 Sila–Nunam (provisional designation 1997 CS29) is a cold[9] classical Kuiper belt object (cubewano) and binary system made up of components of almost equal size, called Sila and Nunam, orbiting beyond Neptune in the Solar System.

[13] Sila–Nunam was discovered on 4 February 1997 by Jane X. Luu, David C. Jewitt, Chad Trujillo, and Jun Chen at the Mauna Kea Observatory, Hawaii, and given the provisional designation 1997 CS29.

As a result, its size, while it was assumed to be a single body, was estimated to lie within the range of 250 to 420 km (155 to 260 mi).

The rotation of both components of the system is synchronously locked with the orbital motion and both bodies are elongated with their long axes pointing to each other.

They orbit at a distance of 2,777 ± 19 km (1,726 ± 12 mi) every 12.51 days:[9][11] Each has apparently been resurfaced with ejecta from impacts on the other.