# Large Millimeter Telescope

*Observatory*

Large Millimeter Telescope, Sierra Negra

| | |
| --- | --- |
| Where it is | 18.9900° N, 97.3100° W |
| State | MX |
| What is done there | radio observatory |
| Dish | 50 m |
| Still working | yes |

Test ranges, observatories and ground stations are a hand-picked list kept in this project rather than a published catalogue: no catalogue answers which of the world's thousands of observing sites belong on a map of it. The article below is what lets the choice be argued with.

## What it is

The Large Millimeter Telescope (LMT), officially the Large Millimeter Telescope Alfonso Serrano, is the world's largest single-aperture telescope in its frequency range, built for observing radio waves in the wave lengths from approximately 0.85 to 4 mm. It has an active surface with a diameter of 50 metres (160 ft) and 1,960 square metres (21,100 sq ft) of collecting area.

## Elsewhere

- This place on the live map: https://www.orbitalmap.space/?at=18.99,-97.31
- The article this row is vouched by: https://en.wikipedia.org/wiki/Large_Millimeter_Telescope
- Every object: https://www.orbitalmap.space/o/
- What this site is and what it reads: https://www.orbitalmap.space/llms.txt

## Where this came from

Compiled 2026-09-17. Selected by hand for this project. Description from Wikipedia (en). Description: CC BY-SA 4.0.