43243

43243 is a small asteroid that was discovered on February 11, 1999, by the Lincoln Near-Earth Asteroid Research (LINEAR) project. It is classified as a near-Earth object (NEO) and belongs to the Apollo group of asteroids, which are known for their Earth-crossing orbits. The asteroid has an estimated diameter of about 1.1 kilometers, making it relatively small compared to other asteroids in the solar system.

43243 has an orbital period of approximately 1.4 years, meaning it completes one orbit around the Sun every 1.4 years. Its orbit is elliptical, with a perihelion (closest approach to the Sun) of about 0.8 astronomical units (AU) and an aphelion (farthest point from the Sun) of about 1.9 AU. The asteroid's orbit is inclined at an angle of about 1.5 degrees relative to the ecliptic plane.

The asteroid's orbit brings it close to Earth on occasion, with the closest approach occurring at a distance of about 0.03 AU, or roughly 4.5 million kilometers. However, even at this distance, 43243 poses no significant threat to Earth, as it is not large enough to cause widespread damage in the event of an impact.

43243 has been the subject of some scientific interest due to its relatively close approaches to Earth and its classification as a potentially hazardous asteroid (PHA). However, further observations and studies are needed to better understand its physical properties and orbital dynamics. The asteroid's small size and relatively low velocity make it a challenging target for detailed study, but ongoing efforts by astronomers and space agencies aim to improve our knowledge of this and other near-Earth objects.