Hey you old CA sniffer!
Nope it's definitely not a Jupiter. I think it's a L' Oiseau de Paradis, designed by Charles Perry back in the early 70s. (Bird of Paradise)
I'll bet that either Model Airplane News or RCM still sell the plan from the construction article that sticks in a back corner of my brain.

Hope that's it, when you do find the plans, you might compare wingspan and length for confirmation.

Enjoy it, whatever it is,
Dean