810 Atossa
810 Atossa (prov. designation: or ) is a bright and elongated background asteroid from the region of the Flora family, located in the inner portion of the asteroid belt. It was discovered on 8 September 1915, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southern Germany. The presumed S-type asteroid has a rotation period of 4.4 hours and measures approximately in diameter. It was named after the ancient Persian queen Atossa (550–475 BC). Orbit and classification Atossa is a non-family asteroid of the main belt's background population when applying the synthetic hierarchical clustering method (HCM) by Nesvorný to its proper orbital elements. However, in an older HCM-analysis by Zappalà from 1995, this asteroid is considered a member of the Flora family (), a giant asteroid family and the largest family of stony asteroids in the main-belt. In a third HCM-analysis by Milani and Knežević (AstDyS), it is also a background asteroid, as this analysis does not recognize the Flora asteroid clan as a proper family. Atossa orbits the Sun in the inner asteroid belt at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,174 days; semi-major axis of 2.18 AU). Its orbit has