203 Pompeja

Based upon photometric observations taken during 2011, it has a synodic rotation period of 24.052 ± 0.001 h, with a peak-to-peak amplitude of 0.10 ± 0.01 in magnitude. Because the rotation period nearly matches that of the Earth, it required coordinated observations from multiple observatories at widely spaced latitudes to produce a complete light curve. As discovered in 2021, Pompeja alongside the main-belt asteroid 269 Justitia have very red colors due to tholins on its surface, similar to trans-Neptunian objects. These asteroids are therefore thought to have formed in the outer Solar System despite their current orbits within the asteroid belt.