  We report on the discovery of Swift J010902.6-723710, a rare eclipsing
Be/X-ray Binary system by the Swift SMC Survey (S-CUBED). Swift
J010902.6-723710 was discovered via weekly S-CUBED monitoring observations when
it was observed to enter a state of X-ray outburst on 10 October 2023. X-ray
emission was found to be modulated by a 182s period. Optical spectroscopy is
used to confirm the presence of a highly-inclined circumstellar disk
surrounding a B0-0.5Ve optical companion. Historical UV and IR photometry are
then used to identify strong eclipse-like features re-occurring in both light
curves with a 60.623 day period, which is adopted as the orbital period of the
system. Eclipsing behavior is found to be the result of a large accretion disk
surrounding the neutron star. Eclipses are produced when the disk passes in
front of the OBe companion, blocking light from both the stellar surface and
circumstellar disk. This is only the third Be/X-ray Binary to have confirmed
eclipses. We note that this rare behavior provides an important opportunity to
constrain the physical parameters of a Be/X-ray Binary with greater accuracy
than is possible in non-eclipsing systems.
