(Mansfield, OH, USA) Large, very colorful. Came to the lights outside after dark. Thanks for identifying!
You are quite fortunate to find a Regal or also called a Royal Walnut Moth. This is one of the large silk moths in the family Saturnidae. The caterpillars are called Hickory Horned devils.
These moths are found in the eastern United States: New York to Florida, west to Texas and Nebraska and more common in the southern areas, more rare in the northern range…so in NE OH you are in the northern range!
Larvae feed on leaves of ash, butternut, cotton, gum, hickory, lilac, pecan, persimmon, sumac, sycamore, walnut.
Adults do not feed. Adults of this family are known to come to lights at night.
I am not sure from the photo if the antenna is feathery, if it is it is a male if not a female. Hope it finds its way back to the trees to lay eggs if it is a female.