ISRO Missions and Discoveries

[pib] Devasthal Optical Telescope

Note4Students

From UPSC perspective, the following things are important :

Prelims level : Devasthal Optical Telescope

Mains level : India's astronomical feats

Indian Scientists have indigenously designed and developed a low-cost optical spectrograph called Devasthal Optical Telescope (DOT).

Devasthal Optical Telescope

  • The ‘Made in India’ optical spectrograph is named as Aries-Devasthal Faint Object Spectrograph & Camera (ADFOSC).
  • It is indigenously designed and developed by Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital.
  • DOT locates sources of faint light from distant quasars and galaxies in a very young universe, regions around supermassive black-holes around the galaxies, and cosmic explosions.
  • Such spectroscopes were so far imported from abroad involved high costs.

Try this PYQ:

Q.“Event Horizon” is related to:

(a) Telescope

(b) Black hole

(c) Solar glares

(d) None of the above

Special features

  • It is about 2.5 times less costly compared to the imported ones and can locate sources of light with a photon-rate as low as about 1 photon per second.
  • It has been successfully commissioned on the 3.6-m Devasthal Optical Telescope (DOT), the largest in the country and in Asia, near Nainital Uttarakhand.
  • This instrument uses a complex arrangement of several lenses made of special glasses, polished to better than 5-nanometer smoothness to produce sharp images of the celestial sky.
  • Photons coming from distant celestial sources, collected by the telescope, are sorted into different colours by the spectrograph and are finally converted into electronic recordable signals.
  • It uses an in-house developed Charge-Coupled Device (CCD) camera cooled to an extremely low temperature of -120 0
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