Optical outburst in U, B, V, R, I, and H bands at JD 2 445 610 (Giovannelli et al. 1984) just at the sixth periastron passage after 811205-E. The red line marks the periastron passage, six cycles after 811205-E; X-ray data (reported in GSG92) are marked with blue stars; the blue line marks the maximum of the X-ray outburst.
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