Brussels Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.30

Bortle class

Class 9 (Class 9)

Darkness Quotient

18%

Dataset

April 2026

Inner city sky

Brussels: The Practical Verdict

Brussels, being a major city and the capital of Belgium, is under intense light pollution, categorised as extreme. Observing conditions here are challenging, with a measured Bortle 9 sky and the Milky Way entirely obscured by the urban glow. This results in a severe limitation for deep-sky astronomy.

Observers within the city can focus on targets less affected by light pollution, such as the Moon, planets, and double stars. Narrowband imaging may manage to capture the brightest emission nebulae though with care. Still, broad deep-sky objects and meteor showers are often entirely washed out. The eastern horizon is brighter, while views improve slightly toward the west-south-west.

For serious stargazing, darker skies can be found at Felenne in Namur, about a two-hour drive south-south-east, where a Bortle 4 sky significantly enhances the capability for deep-sky observations and imaging.

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

Felenne, Namur sits about 92 km south south east and reaches Bortle 4, roughly 28x darker.

Moderate dark window

Brussels's longest dark windows fall in December and January, with the shortest nights around June and July. Plan deep-sky sessions around the autumn and winter months for the best combination of long nights and true astronomical darkness.

Frequently Asked Questions

Can you see the Milky Way from Brussels?

No. Brussels is a Bortle Class 9 sky with SQM 17.30, 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 Brussels?

Brussels is Bortle Class 9 (SQM 17.30), a severe urban sky for astronomy.

Is Brussels good for stargazing?

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

Is Brussels good for astrophotography?

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

What can you observe from Brussels?

Primary targets from Brussels 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 Brussels?

The closest meaningfully darker mapped site is Houdeng-Aimeries, Hainaut, about 39 km south south west of Brussels, reaching Bortle 6.

When is the sky darkest in Brussels?

The sky over Brussels is darkest around January, December. Significant summer limitation: around 52 nights per year have no true astronomical darkness.

Is light pollution in Brussels getting better or worse?

Long-term light pollution over Brussels has been broadly stable across the available measurements.

• Houdeng-Aimeries, Hainaut

  Direction

  SSW

  Distance (km)

  39.1

  SQM

  19.92

  Bortle

  6

• Ath, Hainaut

  Direction

  WSW

  Distance (km)

  47.9

  SQM

  19.84

  Bortle

  6

• Felenne, Namur

  Direction

  SSE

  Distance (km)

  91.6

  SQM

  20.93

  Bortle

  4

• Sint-Annaland, Zeeland

  Direction

  W

  Distance (km)

  87.9

  SQM

  19.95

  Bortle

  6

• Odeigne, Luxembourg

  Direction

  SE

  Distance (km)

  113.1

  SQM

  20.44

  Bortle

  5

• De Hoef, North Brabant

  Direction

  ENE

  Distance (km)

  110

  SQM

  20.01

  Bortle

  6