I've used the NAIF SPICE toolkit (https://naif.jpl.nasa.gov/naif/toolkit.html https://naif.jpl.nasa.gov/naif/toolkit.html) which includes the Yarkovsky effect a

I've used the NAIF SPICE toolkit (https://naif.jpl.nasa.gov/naif/toolkit.html https://naif.jpl.nasa.gov/naif/toolkit.html) which includes the Yarkovsky effect and such, important for small bodies.