Brownsville Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.88

Bortle class

Class 9 (Class 9)

Darkness Quotient

22%

Dataset

May 2026

Inner city sky

Brownsville: The Practical Verdict

Brownsville, located in the southern region of Texas, is a small city with significant light pollution. The inner urban sky here falls under a Class 9 Bortle scale, indicative of a severe urban sky. This environment limits the visibility of all but the brightest celestial objects.

From this location, the Moon, planets, and bright stars are your most dependable targets. The Milky Way is not visible at all. While narrowband imaging requires care, it is possible to capture the brightest nebulae. However, most deep-sky and widefield observations are unsuitable due to the sky brightness.

For a noticeable improvement in sky quality, head towards Willacy County, Texas, located about 60 km north-north-east. This site offers a qualitative upgrade to a Bortle 3 sky, making it worthwhile for those interested in 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

Willacy County, Texas sits about 62 km north north east and reaches Bortle 3, roughly 28x 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 17.88, 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 17.88), 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 El Huizachal, Tamaulipas, about 26 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?

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

• El Huizachal, Tamaulipas

  Direction

  ESE

  Distance (km)

  26.4

  SQM

  20.00

  Bortle

  6

• Cameron County, Texas

  Direction

  NNE

  Distance (km)

  29

  SQM

  19.95

  Bortle

  6

• Willacy County, Texas

  Direction

  NNE

  Distance (km)

  62.4

  SQM

  21.48

  Bortle

  3

• Monica, Texas

  Direction

  ENE

  Distance (km)

  26.8

  SQM

  19.79

  Bortle

  6

• Matamoros, Tamaulipas

  Direction

  SSE

  Distance (km)

  44.4

  SQM

  20.24

  Bortle

  6

• Soliseño, Tamaulipas

  Direction

  WNW

  Distance (km)

  32.8

  SQM

  19.66

  Bortle

  6