Angel I was the inhabited first planet of the Angel system in the Alpha Quadrant. This remote planet was located close to the Romulan Neutral Zone and was of strategic importance to the United Federation of Planets. Angel I was a M-class planet and the homeworld of a humanoid species. The planet supported carbon-based flora and fauna and was sparsely populated with intelligent life. The planet had no platinum deposits. (TNG: "Angel One")
- Cygnet XIV, another female-dominated planet
The matte painting used for the capital city was later reused for Starbase 515 ("Samaritan Snare"), a Malcorian city ("First Contact"), a Kriosian city ("The Mind's Eye"), Klaestron city ("Dax"), and a Banean city ("Ex Post Facto").
According to Star Trek: Star Charts (p. 66) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Angel (Alpha Gruis, Al Nair) system was located in the Beta Quadrant. This was a binary system with a pair of B-class stars.