Purple Mountain Observatory

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Purple Mountain Observatory
Purple Mountain Observatory
Purple Mountain Observatory
Organization Chinese Academy of Sciences
Code 330  
Location Nanjing, Jiangsu province, China
Coordinates 32°04′N 118°49′E / 32.067°N 118.817°E / 32.067; 118.817Coordinates: 32°04′N 118°49′E / 32.067°N 118.817°E / 32.067; 118.817
Altitude 267 m (876 ft)
Established 1934
Website www.pmo.ac.cn/
Commons page Related media on Wikimedia Commons

Purple Mountain Observatory (Chinese: 紫金山天文台; pinyin: Zĭjīnshān Tiānwéntái), also known as Zijinshan Astronomical Observatory, is an astronomical observatory located on the Purple Mountain in Nanjing, China.

The longtime director of the observatory (from 1950 to 1984) was Zhang Yuzhe (张钰哲) (Y. C. Chang).

By the late 1980s, increasing light pollution in Nanjing meant Purple Mountain was no longer viable as a working observatory; it has since shifted its focus to public education, with much of the actual scientific work being carried out in its five branch observatories instead: Qinghai (in Delhi), Ganyu, Xuyi, Honghe (in Jiamusi) and Qingdao.


The observatory discovered the periodic comets 60P/Tsuchinshan and 62P/Tsuchinshan, and also the non-periodic C/1977 V1 (Tsuchinshan), also known as Comet 1977 X.

Many asteroids were also discovered at the observatory, including the Trojan asteroids 2223 Sarpedon, 2260 Neoptolemus, 2363 Cebriones, 2456 Palamedes, as well as the eponymous 3494 Purple Mountain.

Near-Earth Object Survey[edit]

The Chinese Near-Earth Object Survey (CNEOS), based at Xuyi Observation Station,[1] started observations in 2006. It uses a 1:04=1:20=1:80 m Schmidt telescope equipped with a 4K by 4K CCD detector with drift-scanning function.[2] Up to August 2012, the program observed 149,971 asteroids, found 1,279 new provisional designation asteroids, and cataloged 251 numbered asteroids (including five Jupiter Trojans, two Hildas, and one Phocaea). The program has obtained 824 Near-Earth Object (NEO) position observations and found four new NEOs, including one Apollo type NEO - 2007 JW2 - and three Amor type NEOs - 2009 MZ6, 2007 RT147, and 2007 QX14.[3]

Image gallery[edit]


  1. ^ "Xuyi Observation Station, Purple Mountain Observatory". Purple Mountain Observatory. Retrieved 26 February 2015. 
  2. ^ Zhao, Haibin; et al. "The new NEO survey project - Chinese Near Earth Object Survey (CNEOS)" (PDF). Lunar and Planetary Institute: Asteroids, Comets, Meteors (2008 conference). Retrieved 26 February 2015. 
  3. ^ "Near Earth Asteroids (NEAs) A Chronology of Milestones - Page 2 (see Oct 2, 2006)". IAU (International Astronomical Union). Retrieved 26 February 2015. 

External links[edit]