Perturbed ephemeris below is based on elements from MPEC 2021-F20. Epoch (TT/JD) T (TT/JD) Peri. Node Incl. 2461760.50000 2461771.8828644 117.62932 207.72853 20.20919 e q a Epoch (TT) 0.4289758 2.1538180 3.77185 2027/12/21.00
m1 = 12.5 + 5 logΔ + 10.0 log r