 List of unnumbered minor planets: 1999 A–R

The "List of unnumbered minor planets: 1999 A–R" refers to a compilation of minor planets (also known as asteroids) that were discovered and observed but have not yet been assigned a permanent numerical designation by the International Astronomical Union (IAU). Minor planets are typically given a provisional designation based on the year of discovery along with a letter and number indicating the order in which they were discovered in that year.