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rothschildia triloba
I tried to get some pictures on the underside of him but I didn't want it to fly away so I tried not to disturb it too much. I hope these will help with ID.
OK, thanks. 2800 ft would mean below 1000 m asl, so it should be Rothschildia triloba. Being asked the 1 million $ question I would take: Rothschildia triloba, female.
Our altitude here is 2800ft and this was in our backyard. I do have some more pictures I will try and add later.
Rothschildia hesperus is a South American species and not found in Panama. There are about 100 Rothschildia species in the Americas. In Central America there are mostly Rothschildia lebeau, Rothschildia orizaba and Rothschildia triloba, however, there might be some other and probably rarer species around. In addition you have some sexual dimorphism which is shown is the shape and proportions of the forewing. I am not sure if you really can ID for sure Rothschildia from a single picture without the native specimen.
On what altitude did you got this one??
Personally I don't think it is Orizaba, this should have, in my eyes, more spiky "patches" on the wings. I would tend to Triloba, but for that I need the exact altitude of the spotting.