June 23, 2024
  • The Himalayan Chandra Telescope of Indian Astronomical Observatory located in Hanle of Ladakh has joined hands with 10 other global telescopes to observe the brightening of BL Lacertae (BL Lac), a blazar located about 950 million light years away from Earth.


  • It is a 2 meter optical-infrared telescope named after Nobel laureate Subramaniam Chandrasekhar.
  • It is situated at the Indian Astronomical Observatory (IAO) in Hanle near Leh in Ladakh.
  • It is currently the tenth highest optical telescope in the world.
  • The telescope remotely operated using a dedicated satellite communication link from the Centre for Research & Education in Science & Technology (CREST), Indian Institute of Astrophysics (IIA), Bangalore.
  • Imaging instruments include a Faint Object Spectrograph, a near infra-red and an optical CCD camera


  • Indian Astronomical Observatory is situated at an altitude of 4500 meters atop Mt. Saraswati in the vast Nilamkhul Plain in the Hanle Valley of Changthang.
  • Other major telescopes at IAO, Hanle site (except Himalayan Chandra Telescope):
    • GROWTH-India Telescope: It is the country’s first fully robotic research telescope.
    • High Altitude Gamma Ray Telescope (HAGAR): It is an atmospheric Cerenkov experiment with 7 telescopes setup in 2008.
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