Brownsville Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.96

Bortle class

Class 9 (Class 9)

Darkness Quotient

23%

Dataset

April 2026

Inner city sky

Brownsville: The Practical Verdict

Brownsville, as a small city in Texas, presents considerable challenges for stargazing. The skies here suffer from high light pollution, rendering almost all deep-sky visual observation impossible. The Milky Way is entirely obscured, reinforced by the city's Bortle 9 rating.

The sky is suited for observing bright targets like the Moon, planets, and prominent stars. Some narrowband imaging is possible with careful equipment calibration, but for most astronomy purposes, including visual deep-sky targets, travelling outside the city is necessary.

For significantly darker skies, Port Mansfield, about 80 km north-north-east, offers a more favourable Bortle 3 environment. It is worth the drive for serious astrophotography or deep-sky exploration.

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

Port Mansfield, Texas sits about 78 km north north east and reaches Bortle 3, roughly 26x darker.

Good dark window

Brownsville'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 Brownsville?

No. Brownsville is a Bortle Class 9 sky with SQM 17.96, 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 Brownsville?

Brownsville is Bortle Class 9 (SQM 17.96), a severe urban sky for astronomy.

Is Brownsville good for stargazing?

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

Is Brownsville good for astrophotography?

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

What can you observe from Brownsville?

Primary targets from Brownsville 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 Brownsville?

The closest meaningfully darker mapped site is Matamoros, Tamaulipas, about 19 km east south east of Brownsville, reaching Bortle 6.

When is the sky darkest in Brownsville?

The sky over Brownsville is darkest around January, December.

Is light pollution in Brownsville getting better or worse?

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

• Matamoros, Tamaulipas

  Direction

  ESE

  Distance (km)

  19.3

  SQM

  20.07

  Bortle

  6

• Buena Vista, Texas

  Direction

  NNE

  Distance (km)

  42.1

  SQM

  20.19

  Bortle

  6

• Port Mansfield, Texas

  Direction

  NNE

  Distance (km)

  77.7

  SQM

  21.50

  Bortle

  3

• Kenedy County, Texas

  Direction

  SE

  Distance (km)

  130.2

  SQM

  21.41

  Bortle

  3

• Nueces County, Texas

  Direction

  E

  Distance (km)

  183.5

  SQM

  20.43

  Bortle

  5