Belém Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.14

Bortle class

Class 8 (Class 8)

Darkness Quotient

24%

Dataset

July 2026

City sky

Belém: The Practical Verdict

Belém, a major city in northern Brazil, is steeped in urban density within the Pará region. The light pollution here is significant, rendering the city's sky poor for serious astronomy. The Milky Way is unfortunately erased by the bright urban sky, leaving few options for deep-sky enthusiasts.

From this site, stargazing is heavily limited to viewing the bright Moon, planets, and stars, possibly indulging in some double-star observing. Solar system events are still visible, and narrowband imaging might be pursued with care. However, visual deep-sky observing, reflection nebulae, and broadband galaxy viewing are not practical in this environment.

To improve observing conditions significantly, Soure, Pará lies around two hours north north-west. This location offers a markedly darker sky with Bortle 2 conditions, making it a suitable destination for deep-sky observations.

At a Glance

Overall

Poor city sky - This is a poor city sky. The Milky Way is not visible and most deep-sky observing is unrealistic from the location itself.

Milky Way

Not visible - The Milky Way is erased by the bright urban sky background.

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

Soure, Pará sits about 108 km north north west and reaches Bortle 2, roughly 27x darker.

Good dark window

Belém retains astronomical darkness throughout the year, so seasonality is less extreme than at higher latitudes. The main limitation is light pollution, not the length of the dark window.

Frequently Asked Questions

Can you see the Milky Way from Belém?

No. Belém is a Bortle Class 8 sky with SQM 18.14, 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 Belém?

Belém is Bortle Class 8 (SQM 18.14), a poor city sky for astronomy.

Is Belém good for stargazing?

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

Is Belém good for astrophotography?

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

What can you observe from Belém?

Primary targets from Belém 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 Belém?

The closest meaningfully darker mapped site is Barcarena, Pará, about 16 km west of Belém, reaching Bortle 5.

When is the sky darkest in Belém?

The sky over Belém is darkest around April, September.

Is light pollution in Belém getting better or worse?

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

• Barcarena, Pará

  Direction

  W

  Distance (km)

  16.2

  SQM

  20.31

  Bortle

  5

• Abaetetuba, Pará

  Direction

  WSW

  Distance (km)

  63.4

  SQM

  21.25

  Bortle

  4

• Tuja, Pará

  Direction

  NE

  Distance (km)

  78.1

  SQM

  20.81

  Bortle

  4

• Soure, Pará

  Direction

  S

  Distance (km)

  103.5

  SQM

  21.60

  Bortle

  3

• Soure, Pará

  Direction

  NNW

  Distance (km)

  108.1

  SQM

  21.71

  Bortle

  2

• Progresso, Pará

  Direction

  ENE

  Distance (km)

  117.6

  SQM

  20.96

  Bortle

  4