Periastron passage at the fourth cycle before 811205-E (JD 4500) (red line) preceded by ~eight days the X-ray outburst of A 0535+26 that started on JD 4508 ending at JD 4537 (blue rectangle) (GSG92 and references therein). Optical U, B, and V data (black points) are taken from Giovannelli et al. (1985).
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