Asters are blooms that open late in the growing season. That’s good for American Painted Ladys and many other butterfly species. Why? Because almost all of the other flowers are gone by then. Asters and goldenrod flowers become the food suppliers.
They are closely related to a similar species, Painted Ladys.
Ladys fly at top speed when approached. They can be approached when they are nectaring, but you’ve got to do so carefully, for they are very wary.
Vanessa virginiensis here in the eastern U.S. overwinter. That means that adults are now snugly hidden away under tree bark, in holes in trees and probably under your wooden back deck! Other will migrate north in April and May.