[vsnet-alert 12966] ER UMa : negative superhump returned?

[Ohshima]

ER UMa : negative superhump returned?

 We have received further observations from Tom Krajci. These
data show  variations like ~ 0.15 mag. However, it is difficult
to determine whether these are negative superhumps due to the
unstablility of the period.
 PDM analysis shows both periods, one suggesting negative 
(0.06244(4)d) and the other suggesting positive (0.06667(10) d).
Though 0.06667 d seems to too long considering past positive superhump
period, more observations are needed in order to determine this.
Further observations are required!