How could such a nice moth not appear to have a common name? Not that common names are anything great at all, but they are at least a reflection that some humans were capable of feeling an appreciation for it.
It did not like me getting too close.
It seemed to like the tansy ragwort best among the choices around.
My impression is that you are a C. multifaria instead of rubroscapus if you have the white border, but many of the sites have identifications by people like me who are nonspecialists who go by what they can find in the book that looks right, without having any way of knowing in which cases there are similar alternatives. Though of course species divisions are not anywhere near the neat and simple things that the layman is led to believe -- and probably especially in the US where creationist monsters have their reasons to keep people from knowing the true and proper nature of...nature.
LATER: I read that they have tufted hairs as caterpillars, like tussock/tiger/etc.