Top: light curve for J161253 (automatically classified as EA-type) folded at P = 35 162.816 ± 0.007 s. Bottom: O−C diagram for J161253 covering just over three years. Blue solid line shows best linear fit (χ2 = 4.15, 235 d.o.f.); green dashed line shows best quadratic fit (χ2 = 1.10, 234 d.o.f.). Although a reasonable quadratic fit to the first three years of data has been achieved, the O−C trends within each year and the location of the partial data from year 4 on the diagram (small points around day 1300) lend more support to a sinusoidal variation. Black dotted line shows best sinusoidal fit (χ2< 1.00 using same O−C uncertainties as for linear and quadratic fits, 233 d.o.f.), with semi-amplitude 256 ± 6 s and modulation period 649 ± 9 d.
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