Forces on a Near-Earth Object
Here is a list of some of the forces on an object in the solar system in near-Earth orbit:
Gravitation - Earth, Sun, Moon, Planets and the Milky Way's Supermassive Black Hole
Electromagnetic - Earth, Sun, Moon, Planets and the Milky Way's Supermassive Black Hole
Solar Wind Plasma from the Sun - Variable due to Solar Flares and its 11-year cycle
Earth' s Atmosphere
Light, Gamma and X-rays - Sun, Stars, Supernovas and Galaxies
Please feel free to add or chop up my list.