Iso-Heikkilä Observatory

Iso-Heikkilä Observatory is a stargazing facility in Turku equipped with telescopes and astronomical equipment for observation work. The building features two 6-meter domes, with one housing a 15-centimeter refractor telescope positioned at approximately 20 meters in elevation.

The site was built in 1937 under Professor Yrjo Vaisala's direction and originally served the University of Turku's astronomy department. In 1972, it transitioned to amateur astronomers as urban growth made professional observations less practical.

The site functions as a gathering place for the Turun Ursa amateur astronomy association, where members and visitors share observations and discuss the night sky together. These gatherings have become part of how the local community engages with astronomy and the cosmos.

The facility is located at Pohjantähdentie 7 and operates primarily for members of the local astronomy community. Those interested in visiting should check availability in advance, as access is mainly restricted to association members.

Before transitioning to amateur use, researchers working here discovered 807 minor planets and seven comets. This remarkable output reflects the site's former importance as a center for professional astronomical discovery.

Location: Turku

Inception: 1937

Elevation above the sea: 20 m

Website: http://turunursa.fi

GPS coordinates: 60.45194,22.22972

Latest update: December 14, 2025 14:41