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| Organization | Turun Ursa ry | ||||||
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| Observatory code | 062  | ||||||
| Location | Iso-Heikkilä,Turku,Finland | ||||||
| Coordinates | 60°27′07″N22°13′47″E / 60.45205°N 22.2298°E /60.45205; 22.2298 | ||||||
| Established | 1937 (1937) | ||||||
| Website | www.astro.utu.fi www.ursa.fi/yhd | ||||||
| Telescopes | |||||||
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  Location of Iso-Heikkilä Observatory | |||||||
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Iso-Heikkilä Observatory (Finnish:Iso-Heikkilän tähtitorni,Swedish:Storheikkilä observatorium) is anamateurastronomical observatory used by a local amateur astronomical association,Turun Ursa ry in theIso-Heikkilä district ofTurku,Finland.
Referred to asTurku Observatory (062) by theMinor Planet Center, it was previously operated by theUniversity of Turku from 1937 to 1972, and is the observatory where several Finnishdiscoverers of minor planets made their observations.
The observatory was originally owned by the department of astronomy of theUniversity of Turku. It was built in 1935 and 1936, and technically designed by physics and astronomy professorYrjö Väisälä. Väisälä's research team discovered a total of 807minor planets and 7comets at the observatory. Väisälä also contributed significantly to research in the areas ofoptics andsurveying.
As the city expanded and a steel factory was built under a kilometer away from the observatory, the astronomy department of the university moved toTuorla Observatory in the 1950s. In the 1960s, an apartment building area was built in Iso-Heikkilä, preventing any observations of low-sky objects in all directions except north. Iso-Heikkilä remained in the use of students for some time, until the university gave up its ownership completely in 1972. The observatory building and the site are now owned by the city of Turku.
The observatory is currently operated by Turun Ursa ry, an astronomical association founded by Yrjö Väisälä in 1928. The association arranged in Väisälä's time and continues to arrange stargazing events for the general public at the observatory. The members use the observatory, as well as theKevola Observatory, for amateur astronomical observations.
The observatory has two 6-meter domes in the East-West direction. The main instruments of the association are located in the western dome: the 15 and 13 centimetertelescopes made by Yrjö Väisälä and a 19 cmSchmidt-Väisälä camera. In the past, the dome has housed a 50 centimeter wide-angle camera which is nowadays located in theKevola Observatory – it was the telescope used to discover the aforementioned minor planets and comets.
In the forest further away from the observatory, about 200 metres (660 ft) to the northeast, is a concrete pillar used by Yrjö Väisälä in the 1940s in hisbaseline measurements. TheVäisälä comparator has been used in important baseline measurements around the world.
Another pillar that remains today is located 500 metres (1,600 ft) to the southwest from the previous one, in a forest across the railway.
