# Cerro Tololo

*Observatory*

Cerro Tololo Inter-American Observatory

| | |
| --- | --- |
| Where it is | 30.1700° S, 70.8100° W |
| State | CL |
| What is done there | optical observatory |
| Main mirror | 4 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 Cerro Tololo Inter-American Observatory (CTIO) is an astronomical observatory located on the summit of Mt. Cerro Tololo in the Coquimbo Region of northern Chile, with additional facilities located on Mt.

## Elsewhere

- This place on the live map: https://www.orbitalmap.space/?at=-30.17,-70.81
- The article this row is vouched by: https://en.wikipedia.org/wiki/Cerro_Tololo_Inter-American_Observatory
- 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.