A planet whose law punishes fraud with death, as Harry Mudd found out in I, Mudd; in the Animated Series the Enterprise is bound for a ceremony there.
Deneb V is the home of the Denebians, mentioned in the Original Series episode I, Mudd. Harry Mudd tells Kirk that he sold the Denebians all the rights to a Vulcan fuel synthesiser, to which he had no title. They checked with the Vulcans, and Mudd was arrested. He had not known that the penalty for fraud on Deneb V is death, although the condemned may choose the method.
Mudd broke out, stole a ship and drifted until the androids of the planet later named after him picked him up.
In the Animated Series episode The Pirates of Orion the Enterprise is on its way to Deneb V for the dedication of a new Academy of Sciences when Spock falls ill with choriocytosis, and the drug that could save him is hijacked by Orion raiders.