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The Observatory


Inauguration of the ITOFF facility, CREST Campus, IIA, India

January 20th, 2021

The newly built India-TMT Optics Fabrication Facility (ITOFF) was recently inaugurated by Vice President of India Shri. Venkaiah Naidu at the Center for Research and Education in Science &...


TMT Optical Test Instruments System Passes Preliminary Design Review

October 26th, 2020

TMT Optics and Systems Engineering teams have reached another major milestone, with a successful “gate” review of the TMT optical Test INstruments System (TINS) preliminary design.


Conceptual Design of TMT’s Wide-Field Optical Spectrometer Instrument Progresses

July 23rd, 2020

One of TMT’s three “Early Light” instruments, the Wide-Field Optical Spectrometer (WFOS), recently underwent an interim Conceptual Design Review via Zoom. The review’s purpose was to assess the...


TMT Engineering Sensors System Advances to Final Design Phase

June 26th, 2020

Recently, the TMT Engineering Sensors System (ESEN) successfully passed its Preliminary Design Review (PDR) and is now ready to enter the Final Design phase. Chris Carter and Scott Michaels, TMT...


TMT Instrumentation Cryogenic Cooling System Moves on to the Final Design Phase

June 18th, 2020

The Thirty Meter Telescope recently reached another critical development milestone with the successful Conceptual Design Review close-out meeting of the Cryogenic Cooling System (CRYO). The online...


TMT’s M1 Metrology Frame in Production

April 29th, 2020

The first TMT primary mirror (M1) metrology frame has been built and delivered to TMT’s technical laboratory near Pasadena. TMT will use the metrology frames, which are auxiliary equipment tools,...


TMT Reaches Major Milestone with Completion of Fully Populated Mirror Segment Prototypes at the Multi-Segment Integration & Test Facility (MSIT)

March 6th, 2020

The Multi-Segment Integration & Test (MSIT) facility at the TMT lab in Monrovia, California, is now fully populated with seven aluminum mirror segment prototypes.


Successful Receiving Inspection of 18 Mirror Blanks in India

February 6th, 2020

One of TMT’s most important components – its huge primary mirror that spans over 30 meters – continues to be manufactured around the world.


TMT Tertiary Mirror Passes Preliminary Design Review

January 22nd, 2020

Pasadena, CA, January 13, 2020 – The design of the Thirty Meter Telescope’s Tertiary Mirror (M3) recently passed the first part of its Preliminary Design Review, which took place over two days in...


Primary Mirror Segment Production has started at Coherent

January 21st, 2020

Coherent Inc., one of the world’s leading providers of lasers and laser-based technology, is now ready to polish all of the TMT primary mirrors segments to be manufactured in the United States.


TMT Observatory Safety System Passes Preliminary Design Review

December 20th, 2019

TMT recently achieved another significant milestone, with the successful preliminary design review of the Observatory Safety System (OSS). The review material was presented by TMT engineers Jimmy...


TMT Project Engineers at Vertical Laboratories in California test TMT Warping Harness Components

November 13th, 2019

The leaf springs required for TMT warping harness mechanism, supporting each one of the 492 primary active segments, are being tested and validated in an Environmental Simulation Laboratory.


TMT Board of Governor Member Dr. Saku Tsuneta Visits TMT Technical Lab

October 28th, 2019

Dr. Saku Tsuneta, Director General of the National Astronomical Observatory of Japan (NAOJ), recently met with TMT experts at the technical laboratory in Monrovia, California. Dr. Tsuneta also...


TMT Common Software Successfully Passes Pre-Shipment Review

October 15th, 2019

The Thirty Meter Telescope Common Software (CSW), which has been under development the past two years, recently passed its pre-shipment review, meaning it is consistent with its original...


TMT’s Telescope Control System Passes Preliminary Design Review

October 1st, 2019

The TMT Telescope Control System (TCS) successfully passed its Preliminary Design Review (PDR) and is now ready to enter its final design phase.


TMT Quality Assurance Helps in the Production of High-Quality M1 Parts

September 16th, 2019

New developments within the TMT Quality Assurance program include the acquisition of an advanced metrology system to measure to very high precision the telescope primary mirror assemblies.


News about TMT in Hawaii

August 22nd, 2019

Letter to the editor that Ed Stone, TMT Executive Director; Christophe Dumas, Observatory Scientist; and Gordon Squires, Vice President External Relations wrote recently in the Honolulu Star...


Coffee Chat on Mirror Segment Fabrication

July 9th, 2019

TMT staff Glen Cole and Christophe Dumas have a coffee-break conversation about Glen’s last trip to Japan and update on TMT mirrors fabrication and verification.


Segment Support Assembly (SSA) Pre-Construction Meeting at Larsen & Toubro in India

June 24th, 2019

Pasadena, CA (June 06, 2019) – A Segment Support Assembly (SSA) “pre-build” meeting at the Coimbatore facility of Larsen & Toubro (L&T) was successfully completed on May 22, 2019. The meeting was...


CILAS to make adaptive optics mirrors for giant Hawaii telescope

June 20th, 2019

TMT featured in the business news of, the leading online resource for professionals working and using photonics based technologies. delivers daily coverage of the optics &...


TMT Executive Software Successfully Passes First Phase of Final Design Review

May 28th, 2019

Pasadena, CA – May 15, 2019 – The TMT Observatory Executive Software (ESW), which will provide the core functionality needed to enable observations of science programs for on-site and remote...


TMT Adaptive Secondary Mirror Passes Conceptual Design

October 18th, 2018

Pasadena, CA - Sept. 25, 2018 – The TMT Project Office recently held a conceptual design review to evaluate the design study for the TMT’s Adaptive Secondary Mirror (AM2) system.


TMT Executive Software Successfully Passes First Phase of Preliminary Design Review

October 11th, 2018

Pasadena, 5 October, 2018 - The TMT Observatory Executive Software (ESW) has passed a key milestone and is now ready to enter final design phase. An ESW Preliminary Design Review phase1 (PDR1)...


The TMT Primary Mirror System Successfully Passes Final Design Review

September 10th, 2018

PASADENA (July 26-27, 2018)– The Thirty Meter Telescope Optics Group recently achieved a critical milestone by passing its Primary Mirror Optics System (M1S) final design review. The review board,...


Thirty Meter Telescope’s Cryogenic Cooling System Passes Conceptual Design Review

August 29th, 2018

PASADENA July 11, 2018 – The conceptual design of TMT’s Cryogenic Cooling System (CRYO) has passed its conceptual design review. Engineers from the Technical Institute of Physics and Chemistry...


TMT Telescope Control System (TCS) Making Progress Toward Preliminary Design Review

June 19th, 2018

Work is moving forward on TMT’s Telescope Control System (TCS), which is responsible for the coordination and control of the various telescope subsystems, responding to commands received from the...


TMT Engineering Talks Series: Wednesday 6th June, 9.00am (PDT) - Roberto Biasi

May 31st, 2018

Announcing the Next TMT Engineering Talk Dr. Roberto Biasi, Microgate for the AdOptica Consortium A Conceptual Design for an Adaptive Secondary Mirror (AM2) for TMT Wednesday 6th June, 9.00am...