[vsnet-alert 12728] ER UMa: what happens?

[Ohshima]

ER UMa: what happens?

 We have further observations from Akazawa-san and Tom Krajci.
Obtained data imply that this "familiar" object shows irregular
variations. According to the period analysis, 0.062232 (17) d
is obtained. However, the interval of peaks appears to be a
little longer although not very confirmed.

 Additionaly, the strength of peak seems to change. On Jan. 24,
the peak which had been strongest weaken suddenly (during 1 ~ 
2 maxima)  and another weaker peak strengthened. Such a behavior
also confuse us. Further observations are strongly encouraged
in order to determine whether this is negative superhumps.