en.wikipedia.org/wiki/Gulf_fritillary
The Gulf fritillary or passion butterfly (Dione vanillae) is a bright orange butterfly in the subfamily Heliconiinae of the family Nymphalidae. The Heliconiinae are "longwing butterflies", which have long, narrow wings compared to other butterflies.
They are most commonly found in Florida and Texas, but this one was seen in a garden in Franklin, TN.