V1159 Ori preprint Dear Colleagues, The following article is accepted for publication in PASJ (Letter). Changing Supercycle of the ER UMa-Type Star V1159 Ori by T. Kato The preprint with figures is available from: http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/V1159_Ori-cycle/ or [vsnet-preprint 31] The analysis is largely based on intensive observations by the VSNET members, and I would like to thank to all observers who have contributed observations of V1159 Ori and other related stars. Regards, Taichi Kato