Murison continues to work with Efroimsky (USNO) on a subset of the solar system/Lagrange equations integrations, with a view towards characterizing the past orbital behavior of planetary satellites (specifically those of Mars). He is writing a tutorial memo on conversion between orbital elements and cartesian coordinates. Efroimsky and Murison are working on a paper together on this work. Murison has been optimizing his Maple program for numerical speed. (Fortunately, Maple includes a code profiling package.) He also incorporated machinery to use a priori time series of planetary obliquity to calculate a time-varying precession vector, and its derivative, as seen in the precessing-nutating planetary frame.

Murison derived expressions for the radial velocity of a binary star component as a function of orbital elements and of time, as a favor for Olling (USNO).

Murison managed to duck most of the OBSS circus this month.