#  Global Web Tour of EHT Observatories 

 





March 25, 2019

 

 

- [ Blog ](/news-categories/blog)
 
 

 

The Event Horizon Telescope is a global network of synchronized radio observatories that work in unison to observe radio sources associated with black holes with angular resolution comparable to their event horizons. The required extreme resolving power makes scientists and engineers go to some of the most extreme environments on the Earth to collect data. On EHT social media pages, [Twitter](https://twitter.com/ehtelescope) and [Facebook](https://www.facebook.com/ehtelescope), and in this blog post we are taking you on a tour to the 8 observatories that participated in acquisition of the 2017 EHT data, as well as to another 3 that will will be a part of this daring endeavor beyond 2017. Find them all on this [interactive map](/array) here on the official EHT website!

**Eight observatories that participated in EHT observations in 2017 (and later):**

Sort   ![The APEX telescope at sunset during the EHT 2018 observing campaign](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/apex_sunset_dornbusch_20180422_191419.jpg?itok=YYoaYtU7) 

 



**Atacama Pathfinder Experiment (APEX)**  
Cerro Chajnantor, Chile  
altitude: 5,100 m  
single dish, 12-m diameter

web: [Tw](https://twitter.com/hashtag/APEX), [Fb](https://www.facebook.com/Atacama-Pathfinder-EXperiment-APEX-141984649180307/), [www.eso.org/apex](/www.eso.org/apex)

Operated by the European Southern Observatory ([ESO](https://www.eso.org/public/), [@ESO](https://twitter.com/ESO), [@ESOAstronomy](https://www.facebook.com/ESOAstronomy)) on behalf of Max Planck Institut fuer Radioastronomie (MPIfR, [@maxplanckpress](https://twitter.com/maxplanckpress), [@maxplancksociety](https://www.facebook.com/maxplancksociety)), Onsala Space Observatory ([@OnsalaRymd](https://twitter.com/OnsalaRymd), [@onsalarymd](https://www.facebook.com/onsalarymd)), and ESO itself.



   ![Snowy sunrise at the Chajnantor Plateau with ALMA.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/ALMA_sunrise_snowy_NAOJ_NRAO_ESO.jpg?itok=rls9wNeC) 

 



**Atacama Large Millimeter/submillimeter Array (ALMA)**  
Cerro Chajnantor, Chile  
altitude: about 5,000 m  
array of fifty-four 12-m diameter and twelve 7-m diameter dishes

web: [Tw](https://twitter.com/almaobs), [Fb](https://www.facebook.com/ALMA.radiotelescope), <https://www.almaobservatory.org/>

ALMA is the result of an international association between Europe ([ESO](https://www.eso.org/public/), [@ESO](https://twitter.com/ESO), [@ESOAstronomy](https://www.facebook.com/ESOAstronomy)), North America (NRAO, [@TheNRAO](https://twitter.com/TheNRAO), [@TheNRAO](http://www.facebook.com/@TheNRAO)) and East Asia ([NAOJ](https://www.nao.ac.jp/en/), [@naoj.eng](https://twitter.com/naoj.eng), [@prcnaoj\_en](http://www.facebook.com/prcnaoj_en)), in collaboration with the Republic of Chile.



   ![IRAM 30-meter telescope under the moonlight.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/iram30m_snow_moonlight_nicolas_billot.jpg?itok=RQYonGZH) 

 



**IRAM 30-meter Telescope**  
Pico Veleta, Spain  
altitude: 2,850 m  
single dish, 30-m diameter

web: <http://www.iram-institute.org/EN/30-meter-telescope.php>

Operated by Institut de Radioastronomie Millimétrique ([IRAM](https://www.iram-institute.org/)), a collaboration between Centre National de la Recherche Scientifique ([CNRS](http://www.cnrs.fr/), [@CNRS](https://twitter.com/CNRS), [@CNRS.fr](http://www.facebook.com/CNRS)), [Max-Planck-Gesellschaft](https://www.mpg.de/en) ([@maxplanckpress](https://twitter.com/maxplanckpress), [@maxplancksociety](https://www.facebook.com/maxplancksociety)), and Instituto Geográfico Nacional ([IGN](http://www.ign.es/web/ign/portal), [@IGNSpain](https://twitter.com/IGNSpain), [@IGNSpain](https://www.facebook.com/IGNSpain)).



   ![JCMT while observing with telescope covered.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/JCMT_draped_night_William_Montgomerie.jpg?itok=1YlfotGc) 

 



**James Clerk Maxwell Telescope (JCMT)**  
Maunakea, Hawaii, USA  
altitude: 4,100 m  
single dish, 15-m diameter

web: [Tw](https://twitter.com/eao_jcmt), [Fb](https://www.facebook.com/EAObservatory), <https://www.eaobservatory.org/jcmt/>

Operated by East Asia Observatory ([EAO](https://www.eaobservatory.org), [@EAObservatory](https://www.facebook.com/EAObservatory)) on behalf of [National Astronomical Observatories, Chinese Academy of Sciences](http://www.cas.cn), National Astronomical Observatory of Japan ([NAOJ](https://www.nao.ac.jp/en/), [@naoj.eng](https://twitter.com/naoj.eng), [@prcnaoj\_en](http://www.facebook.com/prcnaoj_en)), Korea Astronomy and Space Science Institute ([KASI](https://www.kasi.re.kr), [@kasi.re.kr](https://www.facebook.com/kasi.re.kr)), and Academia Sinica Institute for Astronomy and Astrophysics ([ASIAA](https://www.asiaa.sinica.edu.tw/), [@epo\_asiaa](https://twitter.com/epo_asiaa), [@asiaa.tw](https://www.facebook.com/asiaa.tw)). EAO also partners with Vietnam, Thailand, Malaysia, India and Indonesia.



   ![Large Millimeter Telescope ](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/LMT_newsurface_uppoint_sunset_LMT_vcut1.jpeg?itok=U11-2ZJP) 

 



**Large Millimeter Telescope "Alfonso Serrano" (LMT)**  
Sierra Negra, Mexico  
altitude: 4,600 m  
single dish, 50-m diameter

web: [Tw](https://twitter.com/gtmlmt_oficial), [Fb](http://www.facebook.com/gtmlmt.oficial), <http://www.lmtgtm.org/>

Operated by Instituto Nacional de Astrofísica, Óptica y Electrónica ([INAOE](https://www.inaoep.mx/), [@inaoe\_mx](https://twitter.com/inaoe_mx), [@inaoe.oficial](http://www.facebook.com/inaoe.oficial)) and the [University of Massachusetts](https://www.umass.edu/) ([@UMassAmherst](https://twitter.com/UMassAmherst), [@UMassAmherst](https:/www.facebook.com/UMassAmherst)).



   ![All 8 antennas of the SMA in nighttime observation.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/SMA_all8antennas_night_Nov2010_Nimesh_Patel_smcut1.jpg?itok=FJ7fIu5g) 

 



**Submillimeter Array (SMA)**  
Maunakea, Hawaii, USA  
altitude: 4,100 m  
array of eight 6-m diameter dishes

web: <https://www.cfa.harvard.edu/sma/>

Operated by the Smithsonian Astrophysical Observatory ([SAO](https://www.cfa.harvard.edu/sao), [@saoastro](https://twitter.com/saoastro), [@HarvardSmithsonianCenterForAstrophysics](https://www.facebook.com/HarvardSmithsonianCenterForAstrophysics)) and the Academia Sinica Institute of Astronomy and Astrophysics ([ASIAA](https://www.asiaa.sinica.edu.tw/), [@epo\_asiaa](https://twitter.com/epo_asiaa), [@asiaa.tw](https://www.facebook.com/asiaa.tw)).



   ![The Submillimeter Telescope under the night sky.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/SMT_nightsky_Dave_Harvey_smcut1.jpg?itok=IQKzSoQP) 

 



**Submillimeter Telescope (SMT)**  
Mount Graham, Arizona, USA  
altitude: 3,100 m  
single dish, 10-m diameter

web: <http://aro.as.arizona.edu/>

Operated by the [University of Arizona](https://www.arizona.edu/) ([@UofA](https://twitter.com/UofA), [@uarizona](https://www.facebook.com/uarizona)) through the Arizona Radio Observatory ([ARO](http://aro.as.arizona.edu/)).



   ![The South Pole Telescope observing under polar lights.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/SPT_polarlight_Joshua_Montgomery_smcut1.jpeg?itok=QxdAGfLd) 

 



**South Pole Telescope (SPT)**  
South Pole Station, Antarctica  
altitude: 2,800 m  
single dish, 10-m diameter

web: [Tw](https://twitter.com/SPTelescope), <https://pole.uchicago.edu/>

Operated by a collaboration led by the [University of Chicago](https://www.uchicago.edu/) ([@UChicago](https://twitter.com/UChicago), [@uchicago](https://www.facebook.com/uchicago)), with EHT instrumentation provided by the [University of Arizona](https://www.arizona.edu/) ([@UofA](https://twitter.com/UofA), [@uarizona](https://www.facebook.com/uarizona)).







**One additional observatory that participated in EHT observations in 2018 (and later):**

Sort   ![GLT in a long exposure with star trails.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/GLT_long_startrails_MingTang_Chen.png?itok=HpWfx5Xs) 

 



**The Greenland Telescope (GLT)**  
Thule Air Base, Greenland, Denmark  
altitude: 77 m  
single dish, 12-m diameter

web: [Tw](https://twitter.com/hashtag/GreenlandTelescope), <http://vlbi.asiaa.sinica.edu.tw/project.php>  
[https://www.cfa.harvard.edu/greenland12m](https://www.cfa.harvard.edu/greenland12m/)

Operated by the Academia Sinica Institute of Astronomy and Astrophysics ([ASIAA](https://www.asiaa.sinica.edu.tw/), [@epo\_asiaa](https://twitter.com/epo_asiaa), [@asiaa.tw](https://www.facebook.com/asiaa.tw)) and the Smithsonian Astrophysical Observatory ([SAO](https://www.cfa.harvard.edu/sao), [@saoastro](https://twitter.com/saoastro), [@HarvardSmithsonianCenterForAstrophysics](https://www.facebook.com/HarvardSmithsonianCenterForAstrophysics)).







**Two additional observatories that will participate in EHT observations in 2020 (and later):**

Sort   ![New ALMA prototype dish at Arizona Radio Observatory.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/KP12_newdish_frontal_daylight_ARO.jpg?itok=Wa5u4nzy) 

 



**Kitt Peak 12-meter Telescope**  
Kitt Peak, Arizona, USA  
altitude: 1,900 m  
single dish, 12-m diameter

website: <http://aro.as.arizona.edu/>

Operated by the [University of Arizona](https://www.arizona.edu/) ([@UofA](https://twitter.com/UofA), [@uarizona](https://www.facebook.com/uarizona)) through the Arizona Radio Observatory ([ARO](http://aro.as.arizona.edu/)).



   ![NOEMA Observatory in compact configuration.](/sites/g/files/omnuum3116/files/styles/hwp_1_1__360x360_scale/public/eht/files/NOEMA_compact_aerial_IRAM_DiVertiCimes.jpg?itok=i3-BA86j) 

 



**NOEMA Observatory**  
Plateau de Bure, France  
altitude: 2,500 m  
array of twelve 15-m diameter dishes

web: <http://www.iram-institute.org/EN/noema-project.php>

Operated by Institut de Radioastronomie Millimétrique ([IRAM](https://www.iram-institute.org/)), a collaboration between Centre National de la Recherche Scientifique ([CNRS](http://www.cnrs.fr/), [@CNRS](https://twitter.com/CNRS), [@CNRS.fr](http://www.facebook.com/CNRS)), [Max-Planck-Gesellschaft](https://www.mpg.de/en) ([@maxplanckpress](https://twitter.com/maxplanckpress), [@maxplancksociety](https://www.facebook.com/maxplancksociety)), and Instituto Geográfico Nacional ([IGN](http://www.ign.es/web/ign/portal), [@IGNSpain](https://twitter.com/IGNSpain), [@IGNSpain](https://www.facebook.com/IGNSpain)).









 

 

 



 

 

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