3.6 m Devasthal Optical Telescope

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3.6m Devasthal Optical Telescope
3.6m Devasthal Optical Telescope.jpg
ARIES 3.6m Telescope at Devasthal, India
ObservatoryDevasthal Observatory Edit this on Wikidata
Location(s)Nainital district, Uttarakhand, India Edit this at Wikidata
Coordinates29°22′N 79°41′E / 29.36°N 79.68°E / 29.36; 79.68Coordinates: 29°22′N 79°41′E / 29.36°N 79.68°E / 29.36; 79.68 Edit this at Wikidata
OrganizationAryabhatta Research Institute of Observational Sciences Edit this on Wikidata
Altitude2,540 m (8,330 ft) Edit this at Wikidata
Wavelength350 nm (860 THz)-5,000 nm (60 THz)
Telescope styleOptical telescope
Ritchey–Chrétien telescope Edit this on Wikidata
Diameter3.6 m (11 ft 10 in) Edit this at Wikidata
Focal length32.4 m (106 ft 4 in) Edit this at Wikidata
Websitewww.aries.res.in/dot/ Edit this at Wikidata
3.6 m Devasthal Optical Telescope is located in India
3.6 m Devasthal Optical Telescope
Location of 3.6 m Devasthal Optical Telescope

The 3.6m Devesthal Optical Telescope is a clear aperture Ritchey-Chretien style telescope built by Aryabhatta Research Institute of Observational Sciences(ARIES) and is located at the Devasthal Observatory site near Nainital, India. ARIES operates another 1.3m telescope at the same location. The telescope was activated remotely on March 31, 2016 by Indian Prime Minister Narendra Modi and Belgian Prime Minister Charles Michel from Brussels. The telescope optics has been built in collaboration with the Belgian firm Advanced Mechanical & Optical System (AMOS).

The 3.6m DOT is currently the largest reflecting telescope in Asia.[1] The telescope intends to fill a large longitudinal gap in the 4m class of telescopes in the Asia region. The telescope features an optical spectrograph, a CCD imager and a near-infrared spectrograph. The telescope is also the first of kind in India that features an active optics[2] system, featuring a wavefront sensor and pneumatic actuators which compensates for small distortions in the shape of the 4.3 tonne mirror due to gravity or atmospheric aberrations.

See also[edit]


  1. ^ "'Remote Technical Activation' of the 3.6m Devasthal Optical Telescope at Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital". Press Information Bureau, Government of India.
  2. ^ Sagar, Ram (2012). "New optical telescope projects at Devasthal Observatory". Ground-based and Airborne Telescopes IV. Proceedings of the SPIE. 8444. pp. 84441T. arXiv:1304.2474. Bibcode:2012SPIE.8444E..1TS. doi:10.1117/12.925634.