[vsnet-outburst 12470] ER UMa : negative superhumps?

[Ohshima]

ER UMa

 We have received further observations from Enrique de Miguel, Josch
Hambsch, Maehara-san, Crimean Astrophy. Obs. team (observers: Denis 
Samsonov), Jani Virtanen, and Terskol Observatory (observer: Maksim
Andreev, relayed by Elena Pavlenko). According to these data, possible
negative superhumps are seen.
 O-C diagram implies that this object has two phases, showing longer
superhumps and shorter superhumps. While the former superhumps are 
positive superhumps, the latter superhumps appears to have shorter 
period than the period of negative superhumps. This may be an 
appearence. 
 Further observations are required!