A fixed periodic model predicts OGLE-LMC-LPV-00193 across three time splits without a time trend

We test early periodic fits on later public OGLE data for three known red giants with long secondary periods. For OGLE-LMC-LPV-00193, a two-harmonic model without a time trend reduces later squared error by 84 to 97 percent at three time splits. Fitted periods range from 777 to 783 days. A linear time term can destroy this gain at the earliest split. The other two stars give results that depend on the time range or model. At the 60 percent split, all three trend models beat an annual fit, but one fails against a constant mean. A transfer of the early I-band shape predicts sparse later V-band data for two stars. Both bands use OGLE and are not independent instrument confirmation. The result supports repeatable optical shape in one selected source over the tested span. It does not establish a dust-cloud orbit, a new period change, or a new planet. Code, aggregate results, figures, exact input hashes and external retrieval steps are included. Raw OGLE data remain outside the baseline publication.

astronomy · OGLE · long secondary periods · red giants · time validation · dust · instrumental artifacts