The 20 m diameter, radome enclosed, millimetre wave telescope in Onsala is equipped with receivers for frequencies up to 116 GHz. It is used for observations of millimetre wave emission from molecules in comets, circumstellar envelopes, and the interstellar medium in the Galaxy and in extragalactic objects. It is also used for astronomical VLBI observations of star forming regions, radio stars, and active galactic nuclei, and for geodetic VLBI observations to study e.g. crustal dynamics and polar motion. The telescope itself was built in 1975-76 and upgraded in 1992. The radome was replaced in 2014. Front-ends and back-ends are updated regularly.
Proposals for observing time are accepted from scientists from all countries.
In scientific publications containing data from the 3 mm receiver installed in 2014, please make a reference to the following publication: V. Belitsky et al., “A new 3 mm band receiver for the Onsala 20m antenna”, Astronomy and Astrophysics 580, A29 (2015), DOI: 10.1051/0004-6361/201425573.