Danula II was the second planet in the Danula system.
In April of 2323, the Starfleet Academy marathon was held on Danula II. It was a forty kilometer race, and the winner was Starfleet Academy freshman Cadet Jean-Luc Picard. He was the first freshman to win the race. (TNG: "The Best of Both Worlds, Part II")
Picard kept a certificate pertaining to the win in the Picard family album. (Star Trek Nemesis)
According to the Star Trek: Star Charts ("United Federation of Planets"), Danula II was listed as a member of the Federation in 2378.