(5645) 1990 SP

(5645) 1990 SP is a minor planet, also known as a small Solar System body. It received its provisional designation in 1990 when it was first observed. Minor planets are celestial bodies that are neither planets nor exclusively classified as comets. They typically orbit the Sun and include asteroids, Kuiper belt objects, and other trans-Neptunian objects. The numerical designation (5645) indicates its order of discovery; it was the 5645th minor planet to have its orbit sufficiently well-determined to be given a permanent number. The '1990 SP' part of the designation refers to the year of discovery (1990) and the half-month during which it was discovered (S refers to the second half of September). More detailed information about (5645) 1990 SP, such as its orbital parameters, physical characteristics (size, albedo, composition), and any scientific studies related to it, can be found in astronomical databases maintained by organizations like the Minor Planet Center and NASA. These databases collate observational data and derived properties for known minor planets.