 "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.