spacerocks is a Python package that provides high-level abstractions for orbital dynamics and solar system observations. Its modern, expressive API makes it extremely easy to use.

```Python from spacerocks import SpaceRock from spacerocks.units import Units

units = Units() units.angle = ‘deg’

rock = SpaceRock(a=44, e=0.1, inc=10, node=140, arg=109, M=98, epoch=’1 December 2021’, origin=’ssb’, units=units) ```

You can then use the propagate method to propagate the rock to any epoch. This method used rebound’s ias15 integrator

`Python prop, planets, sim = rock.propagate(epochs=['2 December 2022'], model=2) `

Here prop is a SpaceRock object containing the test particles, planets is a SpaceRock object containing the perturbers, and sim is the rebound simulation object.