Altair IV was also the name of the alien world featured in the film Forbidden Planet.
According to the Star Trek: Star Charts (page 44) and on the chart "United Federation of Planets I", the Altair system was located in the Alpha Quadrant. This system, also known as Alpha Aquilae, was a single star system. Primary was a Class A star with a magnitude of +3, which was ten times brighter than Sol. Altair IV was listed as a member planet of the Federation in 2378.