Terrytoons' The Astronut Show was spun off from the character's initial appearance in a Deputy Dawg short 2 years earlier. However, like the good deputy, Astronut didn't hang around very long. His series lasted just the one year.
To get you started, let's take you back to 1962, and "Astronut", uploaded by Dwightffrye:
Now, here's Astronut with his human friend, Oscar, in "The Kisser Plant", first released in 1964:
I will admit I've never seen any of the Astronut shorts, just his appearance with Deputy Dawg. However, the concept was pretty much the same straight through. Rating: B-.