Brownsville Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.78

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

July 2026

Inner city sky

Brownsville: The Practical Verdict

Brownsville, located in southern Texas, is a small city with a suburban setting. The light pollution level is high, with a severe urban sky that significantly limits stargazing quality. One primary constraint is that the Milky Way is completely obscured from view.

Among the objects that are realistically visible here are bright planets, the Moon, and double stars. Imaging efforts should focus on narrowband targets due to pervasive skyglow, while traditional deep-sky visual observing is out of the question. Faint nebulae and broad galaxies are best left for darker sites.

For improved astronomical experiences, consider travelling to Cameron County, Texas, about 50 km to the north north east. This location offers a better sky for serious deep-sky observations and is well worth the drive if you're looking for a more rewarding stargazing venture.

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

Cameron County, Texas sits about 50 km north north east and reaches Bortle 4, roughly 23x 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 17.78, 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 17.78), 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 20 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)

  19.6

  SQM

  20.10

  Bortle

  6

• Cameron County, Texas

  Direction

  NNE

  Distance (km)

  50.3

  SQM

  21.19

  Bortle

  4

• Matamoros, Tamaulipas

  Direction

  SE

  Distance (km)

  30

  SQM

  20.09

  Bortle

  6

• Rincón de las Flores, Tamaulipas

  Direction

  S

  Distance (km)

  51.5

  SQM

  20.27

  Bortle

  6

• Kenedy County, Texas

  Direction

  SE

  Distance (km)

  86.5

  SQM

  20.57

  Bortle

  5

• Reynosa, Tamaulipas

  Direction

  W

  Distance (km)

  93.5

  SQM

  20.14

  Bortle

  6