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Results are presented for a semi-coherent search for gravitational waves fromthe low-mass X-ray binary Scorpius X-1 in Observing Run 3 (O3) data from theLaser Interferometer Gravitational Wave Observatory, using an updated orbitalparameter ephemeris and a hidden Markov model (HMM) to allow for spinwandering. The new orbital ephemeris corrects errors in previously publishedorbital measurements and implies a new search domain. This search domain doesnot overlap with the one used in the original Scorpius X-1 HMM O3 search. Thecorrected domain is approximately three times smaller by area in the $T_{\rmasc}$--$P$ plane than the original domain, where $T_{\rm asc}$ and $P$ denotethe time of passage through the ascending node and the orbital periodrespectively, reducing the trials factor and computing time. No evidence isfound for gravitational radiation in the search band from 60 Hz to 500 Hz.Upper limits are computed for the characteristic gravitational wave strain.They are consistent with the values from the original Scorpius X-1 HMM O3search.

Search for gravitational waves from Scorpius X-1 with a hidden Markov model in O3 LIGO data with a corrected orbital ephemeris