It is the only one of its kind to be operational anywhere in the world.
ILMT is the third telescope facility to come up at Devasthal, which"is considered as one of the best sites for astronomical observations," Professor Dipankar Banerjee, director of ARIES,It will commence full-scale operations this October - along with the 3.6-meter Devasthal Optical Telescope , the largest telescope operating in India and the 1.3-meter Devasthal Fast Optical Telescope .
Around 13 gallons of mercury is filled into a container that will be rotated at a fixed constant speed along the vertical axis of the ILMT. This process will see the mercury spreading as a thin layer in the container forming a paraboloid-shaped reflecting surface which will now act as the mirror. The surface is ideal for collecting and focusing light.
The mercury mirror of the ILMT has a four-meter diameter with an aperture of f/2 defined by the speed of rotation.A large-format electronic camera located at the focus records the images. Professor Paul Hickson , an expert on liquid mirror technology, said that"the rotation of the earth causes the images to drift across the camera, but this motion is compensated electronically by the camera.
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