I have the argument of perihelion, semi-major axis, eccentricity, inclination and mass. I have tried to look this up but get conflicting answers. Any help would be appreciated.
(Edit) One physics forum gave me this formula,
$$r = a \frac{1 - e^2}{1 + e \cos \theta}$$
Reference: https://www.physicsforums.com/threads/position-of-ascending-and-descending-nodes.534665/ where to my understanding, theta is the true anomaly, this forum also states to minus the argument of perihelion from 360 to get my true anomaly value.
Another stated to do $2 \pi$ - arg of perihelion, though I think this Doesnt apply as it is a Keplerian orbit.