 List of unnumbered trans-Neptunian objects: 1999

The list of unnumbered trans-Neptunian objects (TNOs) includes objects in the outer solar system, particularly beyond the orbit of Neptune. TNOs can be classified into several categories, including classical Kuiper Belt objects, resonant TNOs, and scattered disk objects. In 1999, several unnumbered TNOs were discovered, though the specifics of these objects would depend on the naming conventions and catalogs used at the time.