No dips of at least 5% pass covered 6–18 hour triangle tests of RIK-210 in TESS sector 91

RIK-210 showed 8.8–18.4% dimming events in K2 data from 2014. We test for a return of events on this scale in public TESS sector 91 data from April and May 2025. We search four archived flux series with 6, 9, 12, 15, and 18 hour triangles and three ingress fractions. Each trial needs local baseline data and at least 80% event sampling. We require fitted depth of at least 5% and local signal to noise ratio of at least 8. No primary trial reaches 5%. The largest fitted depth across the four series is 3.17%. Four changes to the PDC baseline also give no pass. The same method detects all nine covered historical events in K2SFF. Native flux injections measure sensitivity with archive flags held fixed. Both SPOC series recover 1,796 of 1,842 covered 8.8% injections, or 97.50%. Coverage rules accept 56.07% of the 3,285 trials at each depth. Some 15% injections fail near a strong brightening. The accepted SPOC data have a 6.29 day gap. This result adds a later measured state of the star. It does not establish permanent loss of the events, test the gaps, or identify a planet or a physical cause. The package includes input data, source records, code, all trials, figures, and reproduction instructions.

RIK-210 · EPIC 205483258 · TIC 413551134 · TESS sector 91 · K2 campaign 2 · stellar dimming · injection recovery · time series