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Observations made of the X-ray pulsar EXO 1722-363 using the ProportionalCounter Array and All Sky Monitor on board the Rossi X-ray Timing Explorerreveal the orbital period of this system to be 9.741 +/- 0.004 d from periodicchanges in the source flux. The detection of eclipses, together with the valuesof the pulse and orbital periods, suggest that this source consists of aneutron star accreting from the stellar wind of an early spectral typesupergiant companion. Pulse timing measurements were also obtained but do notstrongly constrain the system parameters. The X-ray spectra can be well fittedwith a model consisting of a power law with a high energy cutoff and, for somespectra, a blackbody component with a temperature of approximately 0.85 keV.Comment: Accepted for publication in The Astrophysical Journal. 27 pages  including 10 figure

Rossi X‐Ray Timing ExplorerObservations of the X‐Ray Pulsar EXO 1722−363: A Candidate Eclipsing Supergiant System