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We phase-connected the lightcurves observed over 20 years, and obtained a best-fitting period $P = (25,970.0 \\pm 0.1)$ s $\\approx$7.2 hr, and a period derivative $\\dot{P}/P = ( 10.2\\pm4.6) \\times 10^{-7}$ yr$^{-1}$. The X-ray lightcurve shows asymmetric eclipses, with sharp ingresses and slow, irregular egresses. The eclipse profile and duration vary substantially from cycle to cycle. 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