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About the 2.16-m Telescope

The 2.16-m Telescope in the Xinglong Observatory was researched and developed successfully by the joint work of the Beijing Observatory, the Nanjing Astronomical Instrument Research Center, the Institute of Automation, Chinese Academy of Sciences and some other institutes, which lasted about 15 years, and was commissioned in 1974. This achievement won the first prize of National Scientific and Technological Progress Award. It is a symbol of our country being able to research and develop the large precision equipment by ourselves, and is honored as a milestone in the history of Astronomy in China. It used to be the largest optical telescope in China and even in the Far East. The 2.16-m Telescope with a 2.16-m effective aperture has Cassegrain focus and Coude focus, which is simple to change to each other which only needs one minute and is a creation in the world. The 2.16-m Telescope equipped with BFOSC (Beijing-Faint Object Spectrograph and Camera), OMR Low Resolution Spectrograph and HRS (High Resolution Fiber-Fed Spectrograph), which is able to do various kinds of research and is a universal telescope with complete functions.

There are a wide range of basic research topics, which includes violent celestial bodies activity, like supernova explosions and gamma ray bursts, active galactic nucleus and supermassive black holes, start activities and start elemental abundance, sun like systems, sun like stars and outerplanetary stars searching, extrasolar celestial bodies, comets and asteroids, etc. There are about 40 papers published annually.

OMR Low Resolution Spectrograph (spectral resolution: 300-2000) was commissioned in 1996. The grating of it are six aluminized plane reflection gratings, of which the material is Pyrex glass. There is a clever design for this Spectrograph, which is guiding by main light path, and it has a stable performance, which is in favor with astronomers. There are three influential papers published on Nature by using the 2.16-m Telescope and the 60-cm telescope, which is about the deep research of supernova.

By using the 2.16-m Telescope, astronomers in our country got a great quantity of high resolution spectral data of white dwarf, and got the trend of over twenty kinds of element changing with metallicity. They also set the model of element evolution of different stellar population in galaxy, which already have been quoted 120 times. By using the 2.16-m Telescope, astronomers in our country, cooperating with astronomers from Japan, found a companion star of brown dwarf of which the quality is 19 Jupiters near 11 Comae, which is the third brown dwarf found near red giant in the world. This work is a symbol of our country being able to found outer planet by using the method of radial velocity. These works have reached international advanced standards and have a deep influence.

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