Purple Mountain Observatory

File:Bundesarchiv Bild 137-048848, China, Nanking, Sternwarte.jpg

The Purple Mountain Observatory was established in 1934 funded by the Nationalist Government of the Republic of China and administered by Academia Sinica. The longtime director of the observatory from 1950 to 1984 was Chinese astronomer Zhang Yuzhe ({{lang|zh-hans|张钰哲}}, 1902–1986, also known as 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 located at Qinghai (in Delingha), Ganyu, Xuyi, Honghe (in Jiamusi), and Qingdao.

The Minor Planet Center credits the observatory, simply referred to as Nanking, with the discovery of 149 minor planets between 1955 and 1983, while the observatory's PMO NEO Survey Program is credited with more than 600 discoveries between 2006 and 2013.

The observatory discovered the periodic comets 60P/Tsuchinshan and 62P/Tsuchinshan, as well as the non-periodic {{mp|C/1977 V1}} (Tsuchinshan), also known as Comet 1977 X, {{mp|C/2017 E2}}, and C/2023 A3 (Tsuchinshan-ATLAS). They are named after the postal romanization of the name (Wade–Giles: Tzu-chin-shan; pinyin: Zǐjīnshān). Many asteroids were also discovered, including the Trojan asteroids 2223 Sarpedon, 2260 Neoptolemus, 2363 Cebriones, 2456 Palamedes, and the eponymous 3494 Purple Mountain.

The Chinese Near-Earth Object Survey (CNEOS), based at the Xuyi Station {{Obscode|D29}} in Xuyi, Jiangsu,{{cite web|title=Xuyi Observation Station, Purple Mountain Observatory|url=http://english.pmo.cas.cn/rh/dcm/xscm/200908/t20090822_33657.html|publisher=Purple Mountain Observatory|access-date=26 February 2015}} started observations in 2006. It uses a 1:04=1:20=1:80 m Schmidt telescope equipped with a 4K × 4K CCD detector with the drift-scanning function.{{cite web|last1=Zhao|first1=Haibin|title=The new NEO survey project - Chinese Near Earth Object Survey (CNEOS)|url=http://www.lpi.usra.edu/meetings/acm2008/pdf/8098.pdf|publisher=Lunar and Planetary Institute: Asteroids, Comets, Meteors (2008 conference)|access-date=26 February 2015|display-authors=etal}} As of August 2012, the program has observed 149,971 asteroids, found 1,279 new provisional designation asteroids, and cataloged 251 numbered asteroids including five Jupiter trojans, two Hildian, and one Phocaea asteroid. The program has also observed the position of 824 near-Earth objects (NEOs) and discovered four new ones: the Apollo asteroid {{LoMP|285339|{{mp|(285339) 1999 JR|6}}}}, and the three Amor asteroid {{LoMP|410195|{{mp|(410195) 2007 RT|147}}}}, {{LoMP|388567|{{mp|(388567) 2007 QX|14}}}}, and {{LoMP|468681|{{mp|(468681) 2009 MZ|6}}}}.

{{See also|Category:Discoveries by the Purple Mountain Observatory}}

A total of 149 minor planets were discovered by the Purple Mountain Observatory between 1955 and 1983.

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{{See also|Category:Discoveries by the PMO NEO Survey Program}}

Several hundred minor planets were discovered by the observatory's PMO NEO Survey Program from 2006 to 2013.

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File:PurpleMountainObservatory01.JPG|Gate of the Purple Mountain Observatory

File:Purple Mountain Observatory - Xuyu Station Door.jpg|Entrance at the Xuyi Station

File:Purple Mountain Observatory - Xuyu Station.jpg|Telescope at Xuyi Station

• List of astronomical observatories
• Liu Caipin
• Wang Sichao

{{Notelist|refs=

{{efn|name=MPC-discoverers|1=As of 2016, the Minor Planet Center lists 532 discovered bodies by the PMO NEO Survey Program between 2006 and 2013. However, the MPC lists another 3 discoveries by the PMO Neo Survey Program for 2007. {{URL|1=http://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html |2=Minor Planet Center – Minor Planet Discoverers}}}}

}}

{{Reflist|refs=

{{cite web

|title = Minor Planet Discoverers (by number)

|work = Minor Planet Center

|url = https://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html

|date = 11 July 2018

|access-date = 17 July 2018}}

{{cite web

|title=Near Earth Asteroids (NEAs) – A Chronology of Milestones – Page 2 (see Oct 2, 2006)

|url=http://www.iau.org/public/themes/neo/nea2/

|publisher=IAU (International Astronomical Union)

|access-date=26 February 2015}}

{{cite web

|type = 2009-08-15 last obs.

|title = JPL Small-Body Database Browser: (2009 MZ6)

|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3463440

|publisher = Jet Propulsion Laboratory

|access-date = 1 March 2016}}

}}

{{Commons category|Purple Mountain Observatory}}

• [http://www.pmo.ac.cn/ Purple Mountain Observatory website] {{in lang|en|zh}}

{{Nanjing}}

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Category:Astronomical observatories in China

Category:Buildings and structures in Nanjing

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Category:Minor-planet discovering observatories

Category:Major National Historical and Cultural Sites in Jiangsu

Category:Research institutes of the Chinese Academy of Sciences