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4U 1210-64 has been postulated to be a High-Mass X-ray Binary powered by theBe mechanism. X-ray observations with Suzaku, the ISS Monitor of All-sky X-rayImage (MAXI) and the Rossi X-ray Timing Explorer Proportional Counter Array(PCA) and All Sky Monitor (ASM) provide detailed temporal and spectralinformation on this poorly understood source. Long term ASM and MAXIobservations show distinct high and low states and the presence of a 6.7101 +/-0.0005 day modulation, interpreted as the orbital period. Folded light curvesreveal a sharp dip, interpreted as an eclipse. To determine the nature of themass donor, the predicted eclipse half-angle was calculated as a function ofinclination angle for several stellar spectral types. The eclipse half-angle isnot consistent with a mass donor of spectral type B5 V; however, stars withspectral types B0 V or B0-5 III are possible. The best-fit spectral modelconsists of a power law with index gamma = 1.85 (+0.04,-0.05) and a high-energycutoff at 5.5 +/- 0.2 keV modified by an absorber that fully covers the sourceas well as partially covering absorption. Emission lines from S XVI K alpha, FeK alpha, Fe XXV K alpha and Fe XXVI K alpha were observed in the Suzakuspectra. Out-of-eclipse, Fe K alpha line flux was strongly correlated withunabsorbed continuum flux, indicating that the Fe I emission is the result offluorescence of cold dense material near the compact object. The Fe I featureis not detected during eclipse, further supporting an origin close to thecompact object.

Probing the Mysteries of the X-Ray Binary 4U 1210-64 with ASM, PCA, MAXI, BAT and Suzaku