The Andoria-class was a type of explorer fielded by the Federation Starfleet during the 24th century. The Andoria entered service in 2361 and was equipped with the most advanced sensors and scientific equipment they were built to undertake multi-year deep space missions. Prior to the Dominion War Starfleet was constructing three Andoria-class vessels a year. (Spacedock: The Advanced Starship and Construction Manual)