This topic might have a better name.
Needs some form of disambiguating from the planet
Talk about it here.
Arcturus was the Arcturan delegate to Peladon when it applied for membership in the Galactic Federation. He aided Hepesh in attempting to prevent Peladon from joining, secretly planning for his world to exploit the planet's mineral wealth afterwards. He attempted to kill the Third Doctor, but was destroyed by the Ice Warrior Ssorg from a blast of his sonic gun, acting to defend the Doctor. (TV: The Curse of Peladon)
- You may be looking for the planet or the star.