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Table 1

Journal of observations (date of mid-exposure, duration, identifier, and phases for the known periods, see text for details).

Facility JD − 2 400 000 Δt(d) Observation ID/Rev Phases

Cyg OB2 #5 Cyg OB2 #8A
6.6 d 6.7 yr 21.9 d

XMM-Newton 53 308.579 0.242 0200450201/0896 0.354 0.784 0.534
53 318.558 0.266 0200450301/0901 0.867 0.788 0.989
53 328.543 0.290 0200450401/0906 0.380 0.792 0.445
53 338.505 0.266 0200450501/0911 0.890 0.796 0.900
54 220.355 0.368 0505110301/1353 0.541 0.157 0.152
54 224.170 0.382 0505110401/1355 0.120 0.159 0.326
55 738.254 0.344 0677980601/2114 0.591 0.778 0.437

Swift 55571.619 0.214 00031904001 0.337 / 0.831
55 655.836 0.288 00031904002 0.100 / 0.675
55 700.082 0.218 00031904003 0.806 / 0.695
55 743.839 0.616 00031904004 0.438 / 0.692
55 842.169 1.020 00031904005 0.340 / 0.181
56 380.738 0.680 00032767001+2 0.965 0.040 0.764

ROSAT 48368.064 0.274 200109 0.570 0.764 /
49 109.312 4.554 900314 / 0.067 /
49 107.150 0.231 900314 : 1/4 0.586 / /
49 109.465 0.621 900314 : 2/4 0.937 / /
49 110.275 1.094 900314 : 3/4 0.060 / /
49 111.201 0.952 900314 : 4/4 0.200 / /

Suzaku 54 453.965 0.925 402030010 / 0.252 /

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