Asteroid 4998, also known as 1990 QD1, is a small celestial body located in the Asteroid Belt between the orbits of Mars and Jupiter. It was discovered on August 22, 1990, by astronomers at the Palomar Observatory in California. This asteroid is classified as a member of the Apollo group, which are near-Earth asteroids that have orbits crossing that of Earth. With a diameter of approximately 1.5 kilometers, Asteroid 4998 is considered a relatively small asteroid. Its orbit takes it around the Sun every 3.5 years, and it has a highly elliptical path. Scientists study asteroids like 4998 to learn more about the early solar system and the formation of planets.