A proper-motion bound recovers two known orbital-axis signals in 12 selected ATNF 2.9.0 systems

We test a physical bound on orbital-axis changes in ATNF 2.9.0. Twelve of 39 records with a projected-axis derivative have a complete proper motion and an inclination. Two exceed the maximum change from proper motion throughout favorable three-error input boxes. The ratios are 4.43 for J1302-6350 and 27.27 for J1910-5959A. Both signals are known. All available coordinate-frame and inclination choices retain the same flags. At five errors only J1302-6350 remains. Source values for J1910-5959A give a proper-motion ceiling of 1.81e-17 s/s, about 225 times below its reported change. This is larger than the scale stated after equation 7 of its source paper, but does not change the exclusion of proper motion alone. We find no new planet or physical effect. Catalogue selection, mixed timing fits, correlated inputs, and lack of new arrival-time fits limit the result. Code, frozen inputs, source checks, provenance and offline steps are included.

astronomy · pulsar timing · orbital precession · proper motion · ATNF · null discovery result