Could you please explain abnormally broad visual data scatter on RY Dra light curve? Absence of comparison stars in 1-deg field? Different eyes sensitivity for red color? Or something other?
Maybe remark on possble multi-periodicity of RY Dra is needed in VSX?
RY Dra is very red, which can produce widely-varying (no pun intended!) results when observed visually. It is also a bright object, which just adds to the potential for scatter.