Perturbed ephemeris below is based on elements from MPC 61994. Epoch (TT/JD) T (TT/JD) Peri. Node Incl. 2458320.50000 2458322.9619254 359.64552 3.39874 9.73350 e q a Epoch (TT) 0.7847620 0.6561730 3.04859 2018/07/21.00
m1 = 18.5 + 5 logΔ + 5.0 log r