Two source-table checks reduce six orbital-expansion flags to five in an ATNF 2.9.0 screen

We search 95 ATNF 2.9.0 records with a stored orbital period derivative for positive orbital change after a common acceleration term is removed. Seventy records have complete errors and one source reference. Six pass a five-error screening rule. The two largest positive scores lead to source-table checks. The stored orbital derivatives exceed the source values by factors of 10^12 for J1748-2446aw and 100 for J1728-4608. Applying both source values to a derived copy removes the first flag and leaves five flags. Under nonnegative intrinsic spin-down and a common acceleration term, the corrected J1728-4608 value still requires orbital expansion over its fitted interval. This variation is already known. We report two specific catalog scale discrepancies, not a new physical effect. The official catalog program confirms our parsing for all 95 records. Exact error-box tests keep all flag decisions. Timing noise, fit intervals, catalog errors and the absence of independent timing data limit physical claims. Frozen inputs, source locations, hashes, code, tables and offline steps are included.

astronomy · ATNF 2.9.0 · pulsar timing · orbital period derivative · catalog audit · J1748-2446aw · J1728-4608 · null discovery result