The Einasto profile (or Einasto model) is a mathematical function that describes how the density of a spherical stellar system varies with distance from its center. Jaan Einasto introduced his model at a 1963 conference in Alma-Ata, Kazakhstan. The Einasto profile possesses a power law logarithmic slope of the form: which can be rearranged to give The parameter controls the degree of curvature of the profile. This can be seen by computing the slope on a log-log plot: Einasto's model has been used to describe many types of system, including galaxies and dark matter halos.