Santiago Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.34

Bortle class

Class 9 (Class 9)

Darkness Quotient

18%

Dataset

July 2026

Inner city sky

Santiago: The Practical Verdict

Santiago, a global metropolis in Chile's Santiago Metropolitan Region, suffers from extreme light pollution with an inner city sky. Observing conditions are poor for stargazing, with a Class 9 Bortle sky indicating severe urban brightness. The Milky Way is not visible from this location.

In these conditions, the most accessible targets are the Moon, planets, and bright stars. Solar system events and double stars offer some interest for observers. Narrowband imaging is possible with great care, but traditional visual deep-sky observation is largely impractical due to the bright background.

For those seeking better conditions, a drive to Pulín in the O'Higgins Region to the south-west, around 115 kilometres away, offers a Bortle 4 sky. This site provides a meaningfully darker sky suitable for more serious deep-sky observing.

At a Glance

Overall

Severe urban sky - This is a severely light-polluted urban sky. Only the Moon, planets, bright stars, and a few specialist targets remain practical.

Milky Way

Not visible - The Milky Way is not visible from this sky.

Best targets from here

Moon, planets, bright stars, double stars, solar system events, narrowband imaging only with care

Do not prioritise

visual deep-sky observing, broadband galaxies, reflection nebulae, widefield Milky Way

Best nearby upgrade

Pulín, O'Higgins Region sits about 114 km south west and reaches Bortle 4, roughly 27x darker.

Good dark window

Santiago's longest dark windows fall in June and July, with the shortest nights around December and January. For deep-sky imaging, winter gives the best combination of long nights and true astronomical darkness.

Frequently Asked Questions

Can you see the Milky Way from Santiago?

No. Santiago is a Bortle Class 9 sky with SQM 17.34, so the Milky Way is not visible from the city. For Milky Way photography, look for a Bortle 4 or darker site.

What Bortle class is Santiago?

Santiago is Bortle Class 9 (SQM 17.34), a severe urban sky for astronomy.

Is Santiago good for stargazing?

Not for serious deep-sky observing. Santiago is a severe urban sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.

Is Santiago good for astrophotography?

Broadband deep-sky imaging is heavily compromised from Santiago and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Santiago without careful processing.

What can you observe from Santiago?

Primary targets from Santiago include Moon, planets, bright stars, double stars, solar system events. Targets such as visual deep-sky observing, broadband galaxies, reflection nebulae are not realistic from this sky.

Where are darker skies near Santiago?

The closest meaningfully darker mapped site is Las Campiñas, Santiago Metropolitan Region, about 21 km south of Santiago, reaching Bortle 7.

When is the sky darkest in Santiago?

The sky over Santiago is darkest around June, July.

Is light pollution in Santiago getting better or worse?

There is not yet enough long-term data to give a confident trend for Santiago.

• Las Campiñas, Santiago Metropolitan Region

  Direction

  S

  Distance (km)

  21.4

  SQM

  18.93

  Bortle

  7

• Hijuelas, Valparaiso Region

  Direction

  NW

  Distance (km)

  63.4

  SQM

  19.93

  Bortle

  6

• Los Maitenes Sur, Valparaiso Region

  Direction

  W

  Distance (km)

  63.9

  SQM

  19.82

  Bortle

  6

• Pulín, O'Higgins Region

  Direction

  SW

  Distance (km)

  114.4

  SQM

  20.90

  Bortle

  4

• La Ligua, Valparaiso Region

  Direction

  NNW

  Distance (km)

  139.2

  SQM

  20.74

  Bortle

  5

• Distrito Capdevilla, Mendoza

  Direction

  ENE

  Distance (km)

  178.1

  SQM

  20.35

  Bortle

  5