Chinese Future Giant Telescope

Chinese Future Giant Telescope

Location(s)	People's Republic of China
Organization	China National Space Administration
Telescope style	optical telescope proposed building or structure
Diameter	30 m (98 ft 5 in)

The Chinese Future Giant Telescope is a proposed optical telescope with a primary mirror that has a 30-meter diameter. ^[1]

Major characteristics

The Chinese Future Giant Telescope has a primary focal ratio of 1.2. Its primary mirror is segmented with 1020 annular submirrors arranged in 17 concentric annuli. Each segment has average length and width both of 0.8 m. Apart from a conventional Cassegrain focus, four Nasmyth foci on two double-deck platforms on both sides are also present. There is a Coudé focus provided for there interferometric array. The comparatively small secondary mirror is 2.74 m in diameter, which will serve active corrections. ^[1] Other characteristics include:

1. Partial annular submirrors
2. One of coude planar mirrors is aspherical; better image quality is obtained from such a system.
3. A pair of lens-prisms are used in a wide field of view system. Better image quality is obtained and atmospheric dispersion is corrected. ^[2]

See also

• Lists of telescopes

References

1. Li, Guoping (September 2004). Antebi, Joseph; Lemke, Dietrich (eds.). "Preliminary structure design and analysis of the Chinese Future Giant Telescope". Proceedings of the International Society for Optics and Photonics. Astronomical Structures and Mechanisms Technology. 5495: 204. Bibcode:2004SPIE.5495..204L. doi:10.1117/12.551172. S2CID   122073785.
2. Cui, Xiangqun; Su, Ding-Qiang; Wang, Ya-Nan (2003). "Configuration for Chinese Future Giant Telescope". IAU Joint Discussion. 25. The Smithsonian/NASA Astrophysics Data System. Bibcode:2003IAUJD...8E..53C.

Further reading

• Hu, S. W.; et al. (2022). "Concept design for the main structure of 30 m Chinese Future Giant Telescope". Opto-Electronic Engineering. 49 (6). 210402. doi:10.12086/oee.2022.210402.
• Ni, Jijun; et al. (July 2018). The research progress of eddy current edge sensors for Chinese Extremely Large Telescope. Proceedings of the SPIE. Vol. 10700. id. 1070063. Bibcode:2018SPIE10700E..63N. doi:10.1117/12.2312584.
• Zhang, En-Peng; et al. (June 2016). "Preliminary numerical simulation of mirror seeing for the Chinese Future Giant Telescope". Research in Astronomy and Astrophysics. 16 (6). id. 98. Bibcode:2016RAA....16...98Z. doi:10.1088/1674-4527/16/6/098.
• Xin-nan, Li; et al. (October–December 2012). "Study on the Stressed Mirror Polishing with a Continuous Polishing Machine for Large Aperture Off-axis Aspheric Mirrors☆,☆☆". Chinese Astronomy and Astrophysics. 36 (4): 435–444. doi:10.1016/j.chinastron.2012.10.009.
• Jiang, Liyuan; Li, Xinnan (October 2010). Considerations on testing of CFGT primary segments. Proceedings of the SPIE. Vol. 7656. id. 76566H. Bibcode:2010SPIE.7656E..6HJ. doi:10.1117/12.866226.
• Liu, Zhong; Cui, Xiangqun (April 2008). Andersen, Torben E. (ed.). The ELT situation in China. Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg. Proceedings of the SPIE. Vol. 6986. id. 698606. Bibcode:2008SPIE.6986E..06L. doi:10.1117/12.801257.
• Xu, Xinqi; et al. (June 2006). Stepp, Larry M. (ed.). Mount control system for the CFGT telescope. Ground-based and Airborne Telescopes. Proceedings of the SPIE. Vol. 6267. id. 62672B. Bibcode:2006SPIE.6267E..2BX. doi:10.1117/12.671059.