Perturbed ephemeris below is based on elements from MPC 65939. Epoch (TT/JD) T (TT/JD) Peri. Node Incl. 2456280.50000 2456265.9563229 171.19381 218.01110 29.07907 e q a Epoch (TT) 0.8153746 1.2799303 6.93258 2012/12/19.00
m1 = 12.5 + 5 logΔ + 15 log r